GOOFIT
62.5mm Big Bore Cylinder & Head Rebuild Kit for 4-Stroke GY6 150cc 180cc 200cc Upgrade 157QMJ 152QMI
62.5mm Big Bore Cylinder & Head Rebuild Kit for 4-Stroke GY6 150cc 180cc 200cc Upgrade 157QMJ 152QMI
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Product Overview
Unleash the maximum potential of your GY6 platform with the GOOFIT 62.5mm Extreme Big Bore Kit. This comprehensive power package is engineered to upgrade standard 150cc (157QMJ) engines into high-displacement 180cc/200cc beasts. Combining a high-grade aluminum alloy cylinder with a precision-machined head, this kit delivers explosive torque and superior heat management, ensuring your ATV, UTV, or racing scooter dominates any terrain.
Product Compatibility
This 62.5mm Extreme Big Bore Kit is engineered as a high-performance upgrade for the standard GY6 150cc platform.
| Category | Compatibility Details |
| Compatible Engine Codes | GY6 150cc: 157QMJ, 157QMI, 152QMI, 152QMJ |
| Engine Platform | 4-Stroke Air-Cooled Horizontal Engines |
| Performance Upgrade | Boosts standard 150cc to 180cc / 200cc / 250cc Class |
| Vehicle Types | Performance ATVs, UTVs, Racing Scooters, Go-Karts |
| Supported Brands | TaoTao, Coolster, Ice Bear, Roketa, Bacci, Wolf, & other GY6 Clones |
| Fitment Note | Designed for 15mm Piston Pin configurations |
Specifications
| Attribute | Technical Details & Measurements |
| Engine Type | 4-Stroke GY6 Horizontal |
| Cylinder/Piston Bore | 62.5mm / 2.46" (Extreme Big Bore) |
| Piston Pin Diameter | 15mm / 0.59" |
| Distributor Diameter | 28mm / 1.1" |
| Material | Premium Aluminum Alloy & High-Temp Steel Liner |
| Cooling System | Optimized Air-Cooled Fins |
| Package Includes | Cylinder Block, Cylinder Head, Piston, Rings, Pin, Clips, Gaskets |
Key Features
- Extreme Displacement Boost: The massive 62.5mm bore significantly increases engine capacity, providing a dramatic surge in horsepower and low-end torque for competitive off-road performance.
- High-Performance Head Design: Features an optimized combustion chamber that ensures faster flame propagation and higher compression, resulting in peak fuel efficiency and power output.
- Hybrid Material Construction: Combines lightweight aluminum for rapid heat dissipation with a high-temperature resistant steel liner for maximum wear resistance under racing conditions.
- All-Terrain Reliability: Meticulously engineered to maintain stable operation during high-load, extreme-temperature use, extending the overall lifespan of your modified engine.
- Complete Top-End Solution: A fully matched kit including the cylinder head and gaskets, designed for a seamless fit and eliminating the guesswork of mixing and matching performance parts.
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Fitment FAQ
Will this part fit my specific model and year?
This cylinder piston kit is intended for This 62.5mm Extreme Big Bore Kit is engineered as a high-performance upgrade for the standard GY6 150cc platform.; Category. Key physical/spec details from the product data include This 62.5mm Extreme Big Bore Kit is engineered as a high-performance upgrade for the standard GY6 150cc platform., Designed for 15mm Piston Pin configurations, Cylinder/Piston Bore: 62.5mm / 2.46" (Extreme Big Bore). Use the compatibility table and product photos together before ordering.
Do I need to match the OEM part number?
Yes. If your original part has a stamped OEM or manufacturer number, match that number first before ordering. For this cylinder piston kit, also compare the bore diameter, piston-pin size, gasket pattern, stud spacing, engine code, stroke type, and cylinder height. This is especially important for GY6 GY6 models because similar model names can use different parts by year or trim.
What models or situations does this part not fit?
Do not order this cylinder piston kit for machines outside the listed compatibility, or for units with different bore sizes, piston-pin diameters, stroke lengths, stud spacing, or gasket patterns. Do not rely only on the model name or engine size.
What should I check before ordering?
Before ordering, compare your original part with the photos and check the bore diameter, piston-pin size, gasket pattern, stud spacing, engine code, stroke type, and cylinder height. Recheck listed specs such as This 62.5mm Extreme Big Bore Kit is engineered as a high-performance upgrade for the standard GY6 150cc platform., Designed for 15mm Piston Pin configurations, Cylinder/Piston Bore: 62.5mm / 2.46" (Extreme Big Bore). If any connector, mounting point, size, or year detail is different, confirm fitment before installation.