Piston Kit 50cc – Ø39.00 mm – GY6 139QMA/B – 101Octane

Description

Original-style piston kit from 101Octane, designed for GY6 50cc 4-stroke engines (139QMA / 139QMB) with a 39.00 mm bore. Ideal for replacing a worn or damaged piston during a top-end rebuild, ensuring reliable compression and smooth engine operation.

Perfect fit for most Chinese 50cc scooters using the standard GY6 engine platform.

Compatible with:
– GY6 50cc (139QMA / 139QMB)
– Common in Baotian, Jonway, Keeway, Znen, TaoTao, Kymco Agility 50 4T (China version), etc.
– All engines with Ø39.00 mm cylinder bore (check before ordering)