Description
61mm Big Bore Kit for GY6 125cc and 150cc Engines
This 61mm big bore kit significantly increases the displacement of compatible GY6 125cc and 150cc four-stroke engines to approximately 171.3cc. Designed for direct installation without the need for engine case modifications, this kit is perfect for those looking to improve their performance. It is one of the GY6 scooter parts that can help riders achieve better acceleration and power. The kit includes all necessary components for installation, making it a solid choice for both enthusiasts and DIY mechanics.
Construction and Components
The big bore kit is made from aluminum, which promotes efficient heat transfer. It features a short-skirt piston that minimizes reciprocating mass, contributing to improved engine response. Included in the kit are the cylinder, piston, compression rings, wrist pin, fasteners, and gaskets, ensuring you have everything needed for a complete installation.
Fitment and Compatibility
This kit is tailored for GY6 125cc–150cc four-stroke engines marked with QMI or QMJ codes. It is compatible with GY6-A engine cases featuring a 54mm cylinder stud spacing. Before installation, ensure that your engine meets the specifications, as it is incompatible with GY6 B-Block or 161QMK engines.
Specifications
- Material: Aluminum
- Bore: 61mm
- Displacement: Approximately 171.3cc
- Outer Cylinder Skirt Diameter: 62.99mm
- Cylinder Stud Spacing: 54mm
- OEM Part Number: 603C02GY661
- Country of Origin: Taiwan
Fitment
This big bore kit is suitable for various scooters and engines, specifically:
- Genuine scooters: Buddy 125, Buddy 150, Blur 150
- GY6 scooters: Select TaoTao, Wolf, Ice Bear, Bintelli, Peace Sports, ZNEN, SSR, SYM
- Go-karts and buggies: Select Hammerhead 150, Trailmaster 150, Yerf-Dog, Carter Talon
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 Parts
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