Description
58.5mm Big Bore Kit for GY6 125cc and 150cc Engines
The 58.5mm Big Bore Kit is designed for GY6 125cc and 150cc 4-stroke engines. This kit includes a forged piston, which increases engine displacement to 155cc. It is one of the GY6 scooter parts that improves your engine's performance without the need for crankcase modifications. It can be installed by those with basic mechanical skills.
Construction of the Kit
This big bore kit features a forged piston, which is known for its strength and reliability. The overall height of the cylinder is 91.5mm, while the outer sleeve diameter measures 60.3mm. With a stud spacing of 76.5mm, this kit is engineered for a precise fit in compatible GY6 engines.
Installation Considerations
The 58.5mm Big Bore Kit requires no modifications to the crankcase. This kit is designed to be bolted directly onto the engine, making it suitable for those looking to boost their engine's power without extensive mechanical work.
Specifications
- Bore: 58.5mm
- Outer Sleeve Diameter: 60.3mm
- Displacement Increase: 155cc
- Overall Height (Cylinder): 91.5mm
- Stud Spacing: 76.5mm
Fitment
This big bore kit is compatible with GY6 QMI/QMJ 152 and 157 engines. It can be fitted to various makes and models that utilize these engine types.
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
Customer Reviews
Payment & Security
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.