Top Performances 80cc Cylinder Kit – for GY6 4T 50cc (139QMA / 139QMB)

Description

Upgrade your GY6 50cc scooter with this Top Performances 80cc cylinder kit, designed for 4-stroke engines based on the 139QMA / 139QMB platform. This bolt-on big bore kit significantly improves torque, acceleration, and overall rideability, making it perfect for everyday commuting or light tuning.

Made from high-quality aluminum with a cast-iron liner, the kit ensures durability, excellent heat dissipation, and long service life.

Compatible with:
– All scooters using GY6 50cc 4T engines (139QMA / 139QMB)
– Common on: Baotian, Keeway, Longjia, Znen, Kymco Agility 50 (older models), SYM Orbit, and many more
– Fits most Chinese 50cc 4-stroke scooters

Kit includes:
– 47 mm cylinder (≈80cc displacement)
– Piston + piston rings
– Piston pin (13 mm) + circlips
– Gaskets (base and head)
– Optional: Head not included (uses original 50cc head)