Description
180cc Big Bore Kit for GY6 125cc and 150cc Engines
This 63 mm Forged Piston Big Bore Kit is designed to improve the performance of compatible GY6 125cc and 150cc four-stroke engines. By increasing the displacement to approximately 180cc, this kit provides a solid foundation for better torque and acceleration. It is one of the GY6 scooter parts that can significantly boost your engine's capabilities, ensuring a more powerful ride.
Key Components
The kit includes a finned cylinder that aids in cooling, along with a forged piston, piston rings, a wrist pin, retaining clips, and necessary gaskets for installation. The finned design helps effectively dissipate heat, which is important for maintaining engine performance. With these components, you can expect a noticeable increase in power delivery.
Installation Requirements
Installing this big bore kit requires modifications to the crankcase, making it a more involved process than a simple drop-in replacement. It's important to have the right tools, such as an engine case boring tool, to complete the installation correctly. Ensure that you are prepared for the necessary adjustments to accommodate the new cylinder and piston.
Specifications
- Engine application: Compatible with GY6 125cc / 150cc four-stroke engines; not for QMK or 169cc engines
- Bore: 63 mm
- Displacement: Approximately 180cc, depending on crankshaft stroke
- Outer sleeve diameter: 64.9 mm
- Cylinder height: 90 mm
- Wrist pin: 15 mm diameter × 48 mm length
- Cylinder-stud spacing: 54 × 54 mm center-to-center
Fitment
This big bore kit is designed for specific 125cc and 150cc four-stroke engines. Ensure compatibility with your engine model by verifying the specifications below:
- 157QMJ
- 152QMI
- YN1P57QMJ
- JJ157QMJ
- 1P57QMJ
- BN157QMJ
- 1P52FMI
- 154FMI
Not sure it fits? Contact us with your scooter's make, model and year and we'll confirm the fit before you order.
Shop more: GY6 Scooter Parts · Chinese Scooter Parts · Scooter Big Bore & Cylinder Kits · Scooter Pistons & Piston Rings · Scooter Parts
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