If you’re a Honda Grom rider, you know how frustrating it can be when your bike just doesn’t pack the punch you want. Maybe you’ve felt held back by the stock engine’s limits or wished for more power and better throttle response out on the road or track. You’re not alone—many Grom enthusiasts struggle with squeezing every bit of performance out of their rides.
You can easily boost your Honda Grom’s power and performance in 2026 with top big bore kits like the KOSO 4 Valve Cylinder Head and KITACO Forged Crankshaft, designed to enhance throttle response and durability. These kits offer improved combustion, higher displacement, and smooth installation for models 2013-2021.
Whether you want simple upgrades or full rebuilds, these options deliver longevity and race-ready power. Keep exploring to uncover the best fits and features tailored just for your ride.
| Image | Name | Editor's Rating | Price |
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KOSO 4 Valve Cylinder Head Kit for 14-20 Honda Grom
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KITACO FORGED Crankshaft and Connecting Rod for Honda...
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MOTO1988 Cylinder Piston Ring Gaskets Top End Rebuild Repair...
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KOSO 4 Valve Cylinder Head Kit for 14-20 Honda Grom
- 4V Head Kit Only
The KOSO 4 Valve Cylinder Head Kit is designed to enhance the engine performance of your 2014-2020 Honda Grom with a precise upgrade. Its specialized 4-valve design improves airflow and combustion efficiency, helping your engine run smoother and deliver more power. This upgrade targets common performance limitations by optimizing how air and fuel mix inside the cylinder head.
Built to replace the stock cylinder head, this kit fits seamlessly with your Grom’s existing setup. It weighs just 13.8 pounds and measures 8 x 8 x 6 inches, making it a compact and durable component. The design focuses on long-lasting performance, reducing the need for frequent maintenance and ensuring reliable operation under typical riding conditions.
Installation is straightforward, allowing riders to upgrade their engine without extensive modifications. The cylinder head kit is crafted to handle the demands of daily rides or spirited driving, offering improved throttle response and overall engine efficiency. Its construction supports sustained use, making it suitable for riders who want consistent performance gains.
While it enhances power and efficiency, some users may find limited information on warranty coverage beyond Amazon’s return policy. Additionally, the relatively small number of customer reviews means fewer shared experiences are available to gauge long-term satisfaction.
Best for: Riders of 2014-2020 Honda Grom models seeking a reliable and high-performance upgrade for their engine’s cylinder head.
What We Like:
- Designed specifically for 2014-2020 Honda Grom, ensuring precise fit.
- 4-valve configuration improves airflow and combustion efficiency.
- Compact and lightweight for easy replacement of stock parts.
- Durable construction supports consistent engine performance.
- Simple installation process with minimal modifications needed.
Specification
| Specification | User Benefit |
|---|---|
| Compatibility | Fits 2014-2020 Honda Grom models for easy upgrades |
| Valve Design | 4-valve setup improves engine breathing and power |
| Weight | Lightweight 13.8 pounds for maintaining bike balance |
| Dimensions (8 x 8 x 6) | Compact size ensures seamless replacement |
KITACO Forged Crankshaft and Rod for Honda Grom
- KITACO FORGED Crankshaft and Connecting Rod for Honda Grom / Grom...
- - will NOT work with Stock Bore
- - ONLY for 60mm Bore or LARGER
- - Design for high stress, high-rpm demands of a big bore kit
- - Recommended installation to be done by professional motorcycle...
Experience enhanced engine performance with the KITACO Forged Crankshaft and Rod, designed specifically for Honda Grom models upgraded with big bore kits. This precision-forged assembly is built to withstand the increased stress and RPMs that come with larger bore engines, ensuring reliable power delivery and smooth operation.
Crafted to fit 2013-2018 Honda Grom and Grom SF models equipped with 60mm or larger bores, this crankshaft and connecting rod combination offers durability under demanding conditions. Its forged construction improves strength and fatigue resistance, giving you confidence in your engine’s long-term performance.
This component is not compatible with stock bore sizes, so it is essential to verify your engine specifications before installation. Proper installation by a professional mechanic is recommended to maintain optimal functionality and maximize the benefits of this high-quality upgrade.
Maintenance is straightforward due to the robust design, which resists wear and damage from high RPM use. Choosing this crankshaft and rod ensures your big bore Honda Grom engine runs efficiently and reliably, supporting your performance goals with consistent durability.
Best for: Enthusiasts upgrading their 2013-2018 Honda Grom or Grom SF with big bore kits (60mm bore or larger) seeking a durable, high-performance forged crankshaft and connecting rod.
What We Like:
- Engineered for high stress and high RPM conditions in big bore setups
- Forged construction enhances strength and longevity
- Designed specifically for 60mm or larger bore applications
- Supported by a 30-day return policy for purchase confidence
Specification
| Specification | User Benefit |
|---|---|
| Compatible Models | Fits Honda Grom and Grom SF from 2013 to 2018 |
| Bore Size Compatibility | Suitable for 60mm or larger bores, ensuring proper fitment |
| Forged Construction | Provides enhanced durability and resistance to engine stress |
| Designed for High RPM Use | Maintains reliable performance under demanding conditions |
| Professional Installation | Ensures optimal function and longevity with expert fitting |
MOTO1988 Cylinder Piston Ring Kit for Honda GROM
- Compatible Models: For Honda Motorcycle GROM...
- OEM Part Number: 12100-K26-900, 13101-KYZ-900, 13012-KYZ...
- Package: 1x Cylinder, 1x Piston, 1x RING, 2x Gasket, 2x Oil Seal...
- Tips before Purchase: Please carefully check whether your model...
- After-Sales Service: If you have any questions about our products...
The MOTO1988 Cylinder Piston Ring Kit offers a practical solution for riders aiming to restore their Honda GROM’s engine performance. Designed specifically for models ranging from 2014 to 2020, this kit ensures a reliable top-end rebuild. It helps address common wear and tear issues, improving engine compression and overall efficiency.
Every component in the kit, including the cylinder, piston, rings, gaskets, oil seals, and snap rings, is crafted for durability and compatibility. This comprehensive set reduces the need for multiple purchases, making maintenance more straightforward. Its design supports smooth installation and long-lasting operation.
Intended for those who want to maintain or enhance their Honda GROM125 or CT125A, the kit fits OEM part numbers such as 12100-K26-900. The included parts work together to minimize leaks and wear, contributing to consistent engine performance over time. Regular use can help extend the lifespan of your bike’s engine.
While the kit weighs about 4.44 pounds and includes all necessary components, it is specifically tailored to certain Honda models. Confirming compatibility before purchase ensures the kit will meet your bike’s needs. This focused design avoids compatibility issues and supports targeted repairs.
Best for: Honda GROM 125 and CT125A riders seeking a comprehensive top-end rebuild kit compatible with models from 2014 to 2021.
What We Like:
- Complete set with cylinder, piston, rings, gaskets, oil seals, and snap rings for thorough repairs
- Designed to fit multiple OEM part numbers for precise compatibility
- Durable components that support long-term engine performance
- Simplifies maintenance by providing all necessary parts in one kit
Specification
| Specification | User Benefit |
|---|---|
| Compatibility | Matches specific Honda GROM and CT125A models to ensure a proper fit |
| Included Components | Provides all parts needed for a complete top-end rebuild, saving time and effort |
| Weight | Weighs 4.44 pounds, balancing portability and comprehensive inclusion |
| OEM Part Numbers | Fits established OEM part numbers for trusted replacement accuracy |
Cylinder Piston Ring Kit for Honda GROM 125
- Compatible Models: For Honda Motorcycle GROM...
- Compatible Models: For Honda Motorcycle GROM...
- Compatible Models: For Honda Motorcycle GROM...
- It ensures the smooth operation of the vehicle, pursues better...
- Please read our descriptions and pictures carefully to ensure...
Choosing the right piston ring kit is essential for maintaining the smooth operation of your Honda GROM 125 engine. The Cylinder Piston Ring Kit designed specifically for the Honda GROM 125 ensures a precise fit, reducing engine wear and improving overall performance. It addresses common issues like compression loss and oil leakage, helping your bike run more efficiently.
This kit is crafted with precision-machined components, which enhances durability and long-term reliability. Its design helps maintain optimal engine pressure, contributing to better fuel efficiency and smoother acceleration. The easy-to-install parts make maintenance straightforward, minimizing downtime during repairs or rebuilds.
Compatible with Honda GROM125 models from 2014-2015 and 2017-2020, as well as the CT125A from 2021, this piston ring kit suits multiple model years for versatile use. The specific match to model number 12100-K26-900 ensures you get parts that work harmoniously with your engine’s design.
While the kit weighs 4.43 pounds, which might slightly impact shipping, its robust construction supports dependable engine function. Note that the product release date is marked as December 15, 2025, indicating it may be a future release or available for pre-order.
Best for: Motorcycle riders and Honda GROM 125 owners looking for a durable, easy-to-install piston ring kit to maintain engine performance and reliability.
What We Like:
- Precision-machined parts ensure accurate fit and smooth engine operation
- Compatible with multiple Honda GROM125 model years and CT125A (2021)
- Simplifies engine maintenance with straightforward installation
- Durable construction supports long-term engine health
Specification
| Specification | User Benefit |
|---|---|
| Compatibility | Fits multiple Honda GROM125 years and CT125A 2021 models for flexible use |
| Model Number | Matches exact engine part number to ensure proper fit and function |
| Weight | 4.43 pounds provides sturdy, reliable components without compromising durability |
| Release Date | Upcoming availability allows planning for future maintenance needs |
Motorcycle 57mm Big Bore Cylinder Kit for Honda
- By optimizing the fitting logic between the cylinder inner wall...
- Optimizing the coordinated strategy of cylinder preheating and...
- Adopting a snap on quick release cylinder head and modular...
- Through precise coordination between internal oil circuits and...
- Fit For XRM125 Carburetor
Looking to enhance your Honda motorcycle’s engine without hassle? The Motorcycle 57mm Big Bore Cylinder Kit is designed to boost performance in models like the Grom 125 and SUPRA-X125. This kit improves combustion efficiency by ensuring a tight seal that reduces gas leakage, which helps your engine run smoother and more reliably.
Durability is a key focus with this kit. It features reinforced cooling components and dustproof seals that protect the engine even in tough riding conditions. This means your bike can handle harsh environments without compromising the cylinder’s integrity or performance.
Maintenance is simple thanks to its modular design. The quick-release parts can be serviced or replaced without needing special tools, making upkeep straightforward and less time-consuming. This design also supports easier cold starts and better fuel efficiency, adding convenience to everyday use.
The kit’s compact size demands precision during installation, so some technical skill is helpful. While it’s tailored specifically for certain Honda models, this focused compatibility ensures an optimal fit and function that matches your bike’s requirements.
Best for: Honda motorcycle owners looking to improve engine power, fuel economy, and durability on models like the Grom 125 and SUPRA-X125.
What We Like:
- Enhances combustion efficiency with a tightly sealed design
- Modular construction allows quick and easy maintenance
- Durable cooling and dustproof features boost longevity
- Designed specifically for popular Honda models ensuring proper fit
Specification
| Specification | User Benefit |
|---|---|
| 57mm Big Bore Cylinder | Increases engine displacement for improved power |
| Cylinder block, piston, rings, and gaskets included | Provides all essential parts for a complete upgrade |
| Tight sealing design | Reduces gas leakage for better combustion efficiency |
| Modular design | Enables quick maintenance without specialized tools |
| Reinforced cooling system | Helps maintain engine temperature during heavy use |
| Dustproof seals | Protects engine components from dirt and debris |
Motorcycle Cylinder Kit for Honda MSX125 GROM
- Cylinder Piston Set Fit for Honda MSX125 GROM / MONKEY Z...
- Fit for Honda MSX125 GROM (2013-2021)
- Fit for Honda MONKEY Z125 (2018-2022)
- Fit for Honda SUPER CUB C125 (2018-2022)
- Fit for Honda CT125A (2021)
If you ride a Honda MSX125 GROM from 2013 to 2021, upgrading your engine with the right parts is essential. This Motorcycle Cylinder Kit is designed to fit perfectly, improving your bike’s performance and reliability. It addresses common wear issues and restores your engine’s efficiency.
Crafted by SUICHI, the kit features a 52.4mm cylinder along with a piston, piston ring, gaskets, oil seals, and snap rings. Each component is made for durability and precision, making maintenance straightforward. This comprehensive set reduces the need for frequent repairs and helps keep your engine running smoothly.
The kit also fits several other Honda models like the MONKEY Z125, SUPER CUB C125, and CT125A, covering specific production years. This compatibility ensures you get an exact match for your bike, avoiding fitment problems and ensuring consistent engine performance.
Designed to balance durability with functionality, the parts are engineered to withstand everyday riding conditions. This kit helps maintain your bike’s power output while minimizing wear over time, making it a practical upgrade for long-term use.
Best for: Riders and owners of Honda MSX125 GROM (2013-2021) and compatible Honda models looking for a reliable cylinder kit to enhance engine function and durability.
What We Like:
- Includes all essential components for a complete engine rebuild.
- Precise fitment ensures compatibility with multiple Honda models.
- Durable materials improve engine longevity and reduce maintenance needs.
- Designed by SUICHI for consistent quality and performance.
- Makes engine servicing easier with a comprehensive parts package.
Specification
| Specification | User Benefit |
|---|---|
| 52.4mm Cylinder Kit | Matches engine size for optimal performance |
| Complete component set | Provides all parts needed for smooth installation |
| Compatibility with multiple Honda models | Ensures correct fit and function across different bikes |
| Durable materials | Enhances longevity and reduces frequency of repairs |
| Designed by SUICHI | Assures quality and precise engineering standards |
Athena (P400210100030) 100mm 490cc Big Bore Cylinder Kit
- Athena's Big Bore kit brings the raw power you have been missing...
- Built from race proven designs to Honda factory specifications
- Chosen by the top race teams in all forms of racing including...
- Maximizes HP and service life in Honda Dirt Bikes and offroad...
- Fits the following rides Honda CRF 450 R 2009-2016
You’ll notice an immediate boost in your Honda CRF 450 R’s engine performance with the Athena 100mm 490cc Big Bore Cylinder Kit. This kit is crafted to enhance power output while maintaining reliability for serious riders. It features a forged piston with a molybdenum coating, designed to withstand high stress and extend the engine’s lifespan.
The aluminum cylinder includes a nickel-carbide coating that improves wear resistance. Its widened water jackets help to improve cooling efficiency, reducing the risk of overheating during intense rides. These design choices contribute to more consistent performance and engine protection under demanding conditions.
Installation is straightforward and requires minimal changes to your bike, making it accessible for riders who prefer to handle upgrades themselves. Detailed instructions are included to guide you through the process clearly. For optimal results, re-jetting the carburetor is recommended to match the increased displacement.
This kit is intended for Honda CRF 450 R models from 2009 to 2013, making it a specialized upgrade that targets riders seeking enhanced horsepower and improved thermal management. While it demands some tuning adjustments, the performance gains justify the effort for those focused on racing or high-performance riding.
Best for: Riders upgrading 2009-2013 Honda CRF 450 R motorcycles who want improved engine power and cooling reliability.
What We Like:
- Durable forged piston with molybdenum coating resists wear under high performance.
- Aluminum cylinder with nickel-carbide coating enhances longevity and reduces heat stress.
- Widened water jackets improve cooling efficiency during demanding rides.
- Straightforward installation with clear instructions minimizes modification needs.
Specification
| Specification | User Benefit |
|---|---|
| 100mm bore size | Increases engine displacement for more power |
| 490cc capacity | Boosts overall engine output and performance |
| Forged piston | Enhances durability and withstands high stress |
| Molybdenum coating | Reduces friction and prolongs piston life |
| Aluminum cylinder | Provides lightweight strength and efficient heat dissipation |
| Nickel-carbide coating | Improves wear resistance and surface durability |
| Widened water jackets | Enhances cooling to prevent overheating |
| Compatible with 2009-2013 CRF 450 R | Ensures precise fitment for targeted models |
Athena (P400485100038) 53mm 105cc Big Bore Cylinder Kit
- Athena's Big Bore kit brings the raw power you have been missing...
- Built from race proven designs to Yamaha factory specifications
- Chosen by the top race teams in all forms of racing including...
- Maximizes HP and service life in Yamaha Dirt Bikes and offroad...
- Fits the following rides Yamaha YZ 85 2002-2016
The Athena 53mm 105cc Big Bore Cylinder Kit offers a practical way to increase power for Yamaha YZ 85 riders. Designed to fit seamlessly, it enhances engine performance without complicated modifications. This kit addresses the need for improved horsepower while maintaining reliability during intense riding conditions.
Crafted from aluminum with a nickel-carbide coating, the cylinder ensures long-lasting durability and better heat dissipation. Its widened water jackets improve cooling efficiency, helping the engine stay within optimal temperature ranges. This design reduces wear and helps maintain consistent power output over time.
Included in the kit is a forged, molybdenum-coated piston that enhances strength and reduces friction for smoother engine operation. Most installations require no additional machining, making upgrades more accessible. This setup follows Yamaha’s factory specifications, ensuring compatibility and reliable performance.
For optimal results, adjusting the carburetor with a re-jet is recommended to match the increased displacement. While installation is straightforward for those with mechanical experience, some tuning may be necessary to fully harness the kit’s benefits. This combination of features supports both motocross and off-road racing demands.
Best for: Riders and racers seeking a dependable power upgrade for Yamaha YZ 85 models from 2002 to 2016.
What We Like:
- Durable aluminum construction with advanced coating for improved cooling and longevity
- Includes a forged piston designed to reduce friction and enhance strength
- Fits Yamaha factory specifications, often requiring no machining during installation
- Increases horsepower while maintaining engine reliability
Specification
| Specification | User Benefit |
|---|---|
| 53mm Bore Diameter | Provides increased engine displacement for more power |
| 105cc Capacity | Enhances overall engine output for better performance |
| Aluminum Cylinder with Nickel-Carbide Coating | Offers improved durability and heat dissipation |
| Widened Water Jackets | Keeps engine cooler under demanding conditions |
| Forged Molybdenum-Coated Piston | Reduces friction and improves piston strength |
| Installation Components Included | Simplifies upgrade process with minimal extra work |
FLYPIG 39mm Cylinder Rebuild Kit for Honda 50CC
- Fit for Compatible 50cc Engine Parts Z50 Z50R XR50 CRF50 Dirt...
- Specification: 39mm Bore piston and cylinder head, Pin...
- Include cylinder, cylinder head, piston, wrist pin, bearing...
- Aftermarket Parts 100% Brand New.
- Please Carefully Check All Pictures And Sizes In The Listing To...
For owners of Honda 50cc engines, the FLYPIG 39mm Cylinder Rebuild Kit provides a practical solution to restore and improve engine performance. Designed to replace worn components, this kit helps address common issues like reduced power and inefficient combustion.
This kit includes a brand-new 39mm bore piston, cylinder head, rings, wrist pin, bearing, gaskets, and circlips. Each part is crafted for durability and precision, ensuring a smooth rebuild that extends engine life and maintains consistent performance. The 13mm pin bore adds to the exact fit needed for reliable operation.
Maintenance becomes straightforward with all necessary parts included, reducing the need to source separate components. Its design supports easy installation and a proper seal, which helps prevent leaks and keeps the engine running efficiently.
While compatible with popular models such as Z50, Z50R, XR50, and CRF50, it excludes specific years like the Z50R 1985 and Z50 1981. The kit weighs just over 8 pounds, making it manageable for handling and storage during repair projects.
Best for: Honda 50cc engine owners seeking a comprehensive and reliable top-end rebuild kit that supports performance and durability.
What We Like:
- Complete kit with all essential parts for a thorough cylinder rebuild
- Durable aftermarket components designed for consistent engine power
- Precise fit with a 13mm pin bore for easy installation
- Compatible with several popular Honda 50cc models
- Includes gaskets and circlips for a proper seal and smooth operation
Specification:
| Specification | User Benefit |
|---|---|
| 39mm bore piston | Ensures a proper fit for upgraded engine performance |
| 13mm pin bore | Provides precise compatibility for smooth assembly |
| Complete rebuild kit | Simplifies maintenance by including all necessary parts |
| Weight: ~8 pounds | Easy to handle and store during repairs |
| Model compatibility | Fits multiple Honda 50cc models for versatile use |
Cylinder Works Big Bore Kit for Honda 11001-K01
- Spec: Description: Big Bore Cylinder Kit, Compression Ratio...
- Replaces OEM Numbers: HONDA: 12100-KRN-672, 12100-KRN...
- Fits: Honda CRF 250 R 2004-2009, CRF 250 X 2004-2017
- 1-year warranty protects you after your purchase. We're confident...
- 100% New aftermarket Big Bore Cylinder Kit Compatible...
Looking to enhance your Honda CRF 250’s power with a dependable upgrade? The Cylinder Works Big Bore Kit 11001-K01 offers a precise fit for CRF 250 R (2004-2009) and CRF 250 X (2004-2017) models. This kit is designed to increase engine displacement, providing a noticeable boost in performance without compromising reliability.
The kit includes a cylinder, piston kit, and top-end gasket, all crafted to work seamlessly together. With an 81mm diameter and 269cc displacement, it elevates your bike’s power output while maintaining smooth engine operation. The 13.0:1 compression ratio supports efficient combustion for improved throttle response.
Durability is a key focus, as the components are built to withstand the demands of off-road use and everyday riding. The kit replaces the OEM parts like 12100-KRN-672, ensuring compatibility and ease of installation with proper mechanical knowledge. Routine maintenance remains straightforward, as the included gasket helps maintain a tight seal to prevent leaks.
While this upgrade adds some weight compared to standard parts, it offers a solid balance between enhanced performance and engine longevity. Riders can expect a reliable enhancement tailored specifically for their Honda CRF 250 models.
Best for: Riders and enthusiasts aiming to boost the power and efficiency of their Honda CRF 250 R (2004-2009) or CRF 250 X (2004-2017) with a durable and well-matched big bore upgrade.
What We Like:
- Complete kit with cylinder, piston, and gasket for a cohesive upgrade
- Increased displacement and compression ratio improve engine performance
- Designed for durability under demanding riding conditions
- Compatible replacement for specific Honda CRF 250 models
- Maintains ease of maintenance with included gasket
Specification
| Specification | User Benefit |
|---|---|
| Cylinder diameter: 81mm | Provides increased engine size for more power |
| Displacement: 269cc | Enhances overall engine performance and responsiveness |
| Compression ratio: 13.0:1 | Improves combustion efficiency for better throttle feel |
| Components included | Ensures all necessary parts for a complete top-end rebuild |
| Weight: 3 pounds | Offers a balance between durability and manageable weight |
233cc Big Bore Cylinder Piston Kit for Honda
- 【Vehicle Compatibility】Compatible with Honda CRF150F CRF...
You’ll notice a significant boost in your Honda’s performance with the 233cc Big Bore Cylinder Piston Kit. This upgrade increases your engine’s displacement from 150cc to 233cc by enlarging the bore to 70mm. It offers a straightforward way to enhance your bike’s power without altering the engine’s core components.
Designed for easy installation, the kit includes a cylinder block, piston, ring set, and gasket. These parts fit directly onto compatible models such as the CRF150F (2006-2019), XR150 series, and CBF150. The precision machining ensures a proper fit, contributing to reliable and consistent engine operation.
Durability is a key feature of this kit. Made from high-quality materials, it withstands regular use and helps maintain engine integrity over time. Maintenance remains manageable because the kit replaces original parts with components designed for longevity.
This upgrade is ideal for riders who want better engine performance without complex modifications or tuning challenges. However, some tuning adjustments may be necessary after installation to achieve optimal results. Its compatibility is limited to specific Honda models, so confirming your bike’s fitment is important before purchase.
Best for: Riders and mechanics seeking a simple, durable upgrade to increase engine displacement and power on select Honda motorcycles.
What We Like:
- Easy direct replacement with no engine modification needed
- Boosts engine displacement from 150cc to 233cc for improved power
- Precision-machined components ensure reliable fit and performance
- Durable materials support long-term engine health
- Suitable for popular Honda models like CRF150F, XR150, and CBF150
Specification
| Specification | User Benefit |
|---|---|
| Engine displacement: 233cc | Provides more engine power and torque for better performance |
| Bore size: 70mm | Enlarged bore increases engine capacity efficiently |
| Compatible models | Fits CRF150F (2006-2019), XR150 series, and CBF150, ensuring proper fit |
| Included parts | Complete kit with cylinder block, piston, ring set, and gasket simplifies installation |
| Material quality | Made from durable, precision-machined materials for long-lasting use |
TB 132cc Big Bore Kit – CRF110 13 & Up Models
- Fits all Honda CRF110 year models
- Largest bore you can go without boring the cases
- More power and fun at an affordable price
- Easy bolt-on kit
- The cylinder includes a temperature sensor port for the 2019 and...
The TB 132cc Big Bore Kit is designed to enhance the performance of your 2013 or newer Honda CRF110 with a straightforward upgrade. It increases engine displacement and compression, providing a noticeable boost in power. This upgrade is ideal for riders seeking a more responsive and enjoyable ride without complex modifications.
This kit fits all CRF110 models from 2013 onward and includes a temperature sensor port for fuel-injected engines. This feature allows for better engine monitoring and compatibility with existing systems. While installation is simple for most models, fuel-injected versions require ECU tuning to maintain optimal fuel-air mixtures and prevent lean running conditions.
Durability is a key focus, with the kit’s aluminum construction ensuring long-lasting performance and heat resistance. Maintenance remains manageable, but users should be aware that the 132cc piston requires a 1.5mm base gasket unless combined with the Big Valve Kit. This detail is important for ensuring proper fit and engine reliability.
Overall, this bolt-on kit improves your bike’s power and functionality with minimal hassle. It offers a practical way to upgrade your CRF110 for better performance while keeping installation and maintenance straightforward.
Best for: Riders of 2013 and newer Honda CRF110 models looking for an affordable and straightforward engine performance upgrade.
What We Like:
- Compatible with all 2013+ CRF110 models for easy installation.
- Increases engine displacement and compression, boosting power.
- Includes temperature sensor port for improved engine monitoring.
- Supports ECU tuning to ensure safe operation on fuel-injected models.
- Constructed from durable aluminum for reliable performance.
Specification
| Specification | User Benefit |
|---|---|
| Fits 2013 and newer CRF110 models | Ensures compatibility with a wide range of bikes for easy upgrades. |
| Increases engine displacement and compression | Provides enhanced power and improved engine responsiveness. |
| Temperature sensor port included | Enables accurate engine temperature monitoring for fuel-injected models. |
| Requires ECU tuning for fuel-injected versions | Maintains proper fuel-air mixture to prevent engine damage. |
| Aluminum construction | Offers durability and resistance to heat for long-lasting use. |
| 1.5mm base gasket needed with 132cc piston | Ensures correct piston fit and optimal engine performance. |
250cc Big Bore Cylinder Kit for ATV & Dirt Bike
- FITMENT:This cylinder kit fit for 250cc Air Cooled Engine ATV...
- HIGH QUALITY MATERIAL:The cylinder head kit are made of strong...
- HIGH QUALITY:High grade cylinder components, featuring high...
- GOOD SEALING PERFORMANCE:Cylinder kit with precise density to...
- REBUILD OUR COMPLETE ENGINE:Top end rebuild kits contains all...
Riders looking to enhance their ATV or dirt bike’s performance will find the 250cc Big Bore Cylinder Kit a practical upgrade. This kit is specially made for 250cc air-cooled engines, fitting a variety of off-road vehicles like ATVs, quads, and dirt bikes. By increasing the bore to 67mm, it effectively boosts engine displacement, which translates into stronger power output for improved riding experience.
Built from durable aluminum, the cylinder kit ensures excellent heat dissipation and corrosion resistance. This means the engine stays cooler under stress, reducing wear and extending the kit’s lifespan. Its robust design helps maintain consistent performance even in demanding environments.
Maintenance is simplified with the included piston set, rings, and gaskets, which guarantee reliable sealing and smooth operation. The kit also features essential accessories such as a flywheel and stator, compatible with popular brands like Suzuki and Yamaha. This makes it easier to rebuild the engine’s top end without sourcing parts separately.
While installation is straightforward for those with mechanical skills, some users may require professional help. Additionally, tuning adjustments might be needed after installation to fully optimize performance. Overall, this cylinder kit provides a balanced solution for riders aiming to increase power without compromising durability.
Best for: Riders and enthusiasts looking to increase the power and performance of their 250cc air-cooled ATV, dirt bike, or similar off-road vehicle.
What We Like:
- Boosts engine displacement with a 67mm bore for enhanced power
- Made from aluminum for better heat management and corrosion resistance
- Includes piston, rings, gaskets, flywheel, and stator for a complete top-end rebuild
- Compatible with Suzuki, Yamaha, and other 250cc air-cooled engines
Specification
| Specification | User Benefit |
|---|---|
| 250cc Big Bore Kit | Increases engine size for improved power and torque |
| 67mm Bore Diameter | Enhances displacement, resulting in noticeable performance |
| Durable Aluminum | Keeps engine cooler and resists corrosion for longer life |
| Piston Set & Rings | Ensures reliable sealing and smooth engine operation |
| Gaskets Included | Provides proper sealing to prevent leaks and maintain pressure |
| Flywheel & Stator | Supports electrical system compatibility and easy installation |
| Compatibility | Fits Suzuki, Yamaha, and other 250cc air-cooled engines |
GOOFIT 44mm Carburetor Air Filter Ignition Coil Kit
- 1.Size:Cylinder Size:44mm;Carb Manifold Intake Diameter:19mm;Air...
- 2.Premium Quality:100% Brand New.Never Used.Professional...
- 3.Fit Model:Replacement for some air cooled Chinese Mini Moto...
- 4.Package Included:Big bore 53cc 54cc engine cylinder piston...
- 5.Reminder/Note:To make sure you buy the right product,please...
The GOOFIT 44mm Carburetor Air Filter Ignition Coil Kit offers a reliable upgrade for mini bike engines between 47cc and 54cc. Designed to improve engine performance, this kit addresses common airflow and ignition issues, helping your bike run smoother and more efficiently. Its components work together to enhance combustion and airflow, making maintenance easier and extending engine life.
Each part in the kit is made from durable, corrosion-resistant materials, ensuring long-lasting use even in demanding conditions. The 44mm cylinder and 58mm air filter are precision-sized to optimize air intake, while the included A7TC spark plug provides consistent ignition. This combination supports a 30:1 two-stroke oil mix, which promotes proper lubrication and engine health.
Installation is straightforward for those familiar with mini bike engines, but checking fitment is essential to avoid compatibility problems. The kit also includes a piston head and cylinder head, adding value by covering multiple critical engine components in one package. Routine maintenance is simplified since the parts are designed to fit seamlessly and withstand wear.
While tailored for specific Chinese mini motos like the CRX50 Dirtbike and Coyote Midi Quad, this kit is not suitable for engines with different cylinder sizes or oil mix ratios. Users should verify engine specifications before purchase to ensure proper function and avoid installation issues.
Best for: Riders and enthusiasts looking to upgrade or maintain 47cc-54cc two-stroke mini bikes, ATVs, and quads, especially those using Chinese mini moto models like the CRX50 Dirtbike and Coyote Midi Quad.
What We Like:
- High-quality, corrosion-resistant materials enhance durability.
- Includes multiple essential engine components for comprehensive maintenance.
- Designed for smooth airflow and reliable ignition with a 30:1 oil mix.
- Precise fitment supports improved engine performance.
- Simplifies maintenance with well-matched parts.
Specification
| Specification | User Benefit |
|---|---|
| 44mm Cylinder | Optimizes air intake for better engine efficiency |
| 58mm Air Filter | Improves airflow while protecting engine parts |
| A7TC Spark Plug | Delivers consistent ignition for smooth starts |
| Supports 30:1 Oil Mix | Ensures proper lubrication and engine longevity |
| Includes Piston & Cylinder Heads | Offers essential components for engine upkeep |
Factors to Consider When Choosing a Honda Grom Big Bore Kit
When you’re picking out a Honda Grom big bore kit, the first thing to do is make sure it fits your specific model. You don’t want to buy something that won’t work with your bike. Next, think about the bore size—this will determine how much of a power boost you’re going to get.
It’s also super important to check the material quality and durability. After all, you want something that’s going to last and keep performing well over time. And don’t forget to look for features that can enhance your bike’s performance even more.
Finally, consider how tricky the installation might be. If you’re not very experienced, a simpler setup could save you a lot of headaches. So, keep all these things in mind to make the best choice for your Honda Grom.
Compatibility With Models
Choosing the right Honda Grom big bore kit means making sure it fits your bike’s exact year and model. You need to verify that the OEM part numbers match your Grom’s original components to avoid installation problems. Pay close attention to the bore size and piston diameter specifications so they align perfectly with your engine’s setup.
Also, confirm the kit supports your bike’s engine displacement, whether it’s the standard 125cc or a big bore upgrade. Don’t forget to review manufacturer recommendations on model compatibility, especially if you’ve made other modifications or plan to use aftermarket parts. Taking these steps guarantees your big bore kit works seamlessly with your Honda Grom, providing better performance without causing mechanical issues.
Bore Size Importance
Although selecting the right bore size might seem straightforward, it plays a crucial role in how your Honda Grom performs after installing a big bore kit. The bore size determines how much your engine’s displacement increases, directly impacting power output. Choosing a larger bore can boost airflow and combustion efficiency, enhancing acceleration and overall performance.
However, you must guarantee precise measurements to fit the kit properly and avoid issues like piston slap or premature wear. Different bore sizes align with specific goals, whether you want higher top speed or more torque, so pick one that matches your riding style. Making the right choice ensures your Grom runs smoothly and safely while delivering the performance you expect.
Material And Durability
Since your Honda Grom’s big bore kit endures intense heat and stress, the materials used directly affect its durability and performance. You want kits made from high-strength alloys or aluminum because they handle heat well and resist deformation under high RPMs. Look for reinforced sealing components and corrosion-resistant coatings. These protect the kit from wear and harsh conditions.
Pistons and cylinders with molybdenum or nickel-carbide coatings markedly reduce friction, which helps extend the kit’s service life. Also, pay attention to the manufacturing process. Precision machining and strict quality control ensure consistent material integrity, preventing cracks or failures.
Choosing a kit with these durable materials means your engine stays reliable and runs smoothly, even under demanding conditions. It’s all about getting the most out of your ride without worrying about breakdowns.
Performance Enhancement Features
When you upgrade your Honda Grom with a big bore kit, you’ll notice a significant boost in horsepower and torque thanks to the increased engine displacement. To get the most out of your upgrade, look for kits with enhanced cooling features like widened water jackets. They help prevent overheating during intense rides.
Precise fitting components and effective sealing are essential to maintain compression and avoid leaks. This ensures consistent power delivery. Durable materials such as forged pistons and corrosion-resistant cylinders also play a key role in sustaining performance under stress.
Finally, check that the kit is compatible with your engine’s existing parts. Be prepared to fine-tune or adjust jetting to optimize the new power output for smooth, reliable performance. It’s all about getting everything working together just right.
Installation Complexity Level
Getting the right performance from your Honda Grom big bore kit also depends on how manageable the installation process is. Some kits come with detailed instructions and all the necessary hardware. That makes them perfect for DIYers with basic tools.
Others, especially high-performance ones that require engine internal modifications, call for professional installation to guarantee everything fits and functions correctly. Keep in mind, kits with extra components like replacement gaskets or customized fittings can increase complexity and installation time.
If ease is a priority, look for kits designed with modular layouts and quick-release features. They simplify the process and reduce the need for specialized tools or extensive engine disassembly. Just be honest with yourself about your mechanical skills before choosing a kit to match your installation comfort level.
Cooling And Sealing
How do you guarantee your Honda Grom big bore kit stays cool and sealed for peak performance? Focus on kits with enlarged water jackets that boost coolant flow and improve heat dissipation. This helps prevent overheating during those intense rides.
Equally important are high-quality piston rings and gaskets. They create a tight seal to stop combustion gas leaks and keep compression where it belongs.
Reinforced dust-proof and waterproof seals protect your engine from contaminants. This means your bike stays stable even in harsh conditions.
Also, pay attention to the cylinder and gasket interface design. It needs to provide a leak-proof connection to keep your engine efficient and durable.
Warranty And Support
Keeping your Honda Grom big bore kit running smoothly goes beyond cooling and sealing. It also depends on the warranty and support backing the product. You’ll want a warranty that covers both parts and labor to protect you against manufacturing defects after installation.
Make sure the warranty includes potential issues from installation or compatibility problems, so you’re fully covered. Check that the manufacturer offers clear warranty claim procedures and accessible customer support. It’s important their team provides technical assistance for installation questions and troubleshooting throughout the warranty period.
Reviewing the terms for replacements, repairs, or refunds helps you understand your options if the product fails. Prioritizing solid warranty and support guarantees peace of mind and reliable performance for your big bore kit. It’s really worth taking the time to get this right!
Price And Value
Choosing the right Honda Grom big bore kit often comes down to balancing price and value. You should compare prices across different kits to guarantee you get the best bang for your buck. Remember, a higher price doesn’t always mean better value, but sometimes more expensive kits offer superior performance or durability that pays off in the long run.
Pay close attention to the included components and their quality, as this affects overall value. Also, look for kits that come with warranties or return policies. These reduce financial risk and add peace of mind.
Finally, hunting for deals online or offline can substantially improve your cost-to-benefit ratio, making your upgrade smarter and more affordable.
Frequently Asked Questions
How Difficult Is the Installation of a Big Bore Kit on a Honda Grom?
Installing a big bore kit on your Honda Grom is moderately challenging. If you’re comfortable with basic mechanical skills and have the right tools, you can handle it yourself. You’ll need to remove the engine, replace the piston and cylinder, and make sure everything’s properly torqued and sealed.
However, if you’re new to engine work, it’s best to get a professional’s help to avoid mistakes that could damage your bike. Taking your time and following instructions carefully will make the process smoother. But don’t hesitate to ask for help if you’re unsure about any step.
Will a Big Bore Kit Affect My Honda Grom’s Fuel Efficiency?
Think of your Honda Grom as a garden hose. The bigger the nozzle, the more water flows, but you’ll use more water overall.
Yes, a big bore kit will likely lower your fuel efficiency because it lets in more air and fuel to boost power. You’ll enjoy the extra punch, but expect your Grom to sip fuel more enthusiastically, especially if you ride aggressively or frequently push it to higher RPMs.
Are There Any Legal Restrictions on Using Big Bore Kits for Street Riding?
Yes, you might face legal restrictions using big bore kits on the street. Laws vary by location, but many places require your bike to meet specific emissions and noise standards. You’ll want to check local regulations before installing one to avoid fines or getting your bike impounded.
Also, some areas require modifications to be inspected or certified street-legal. Always make certain your bike remains compliant to ride safely and legally. It’s better to be safe than sorry when it comes to these rules.
How Often Should I Perform Maintenance After Installing a Big Bore Kit?
You should perform maintenance more often than you change your socks. Aim for roughly every 1,000 to 1,500 miles.
Big bore kits push your engine harder, so don’t get lazy. Check your oil, spark plugs, and valves frequently to keep things humming smoothly.
Think of your bike as a high-maintenance diva. Ignore it, and it’ll throw a tantrum. Stay ahead with regular tune-ups, or enjoy an unexpected roadside breakdown!
Can I Use a Big Bore Kit With the Stock Exhaust System?
Yes, you can use a big bore kit with the stock exhaust system, but you might not get the full performance benefits. The stock exhaust can restrict airflow, limiting power gains from the bigger displacement.
To maximize your bike’s potential, consider upgrading to a high-flow aftermarket exhaust. Still, if you’re aiming for reliability and quieter rides, the stock exhaust will work fine with the kit installed.
Conclusion
Imagine your Honda Grom roaring down the open road, its engine pulsing with newfound power and precision. Choosing the right big bore kit lets you unleash that thrilling potential, whether it’s the smooth KOSO upgrade or the rugged TB 132cc boost.
Keep in mind your riding style and needs, and you’ll feel the difference in every twist of the throttle. Get ready to transform your ride into an unforgettable adventure. With the best Honda Grom big bore kits for 2026, enhanced performance and excitement are just a throttle away.