Jonway 150cc GY6 157QMJ Cylinder Piston Top End Rebuild Kit
Replacement cylinder barrel and piston top-end repair kit for Jonway 150cc scooters equipped with a compatible GY6 157QMJ 150cc four-stroke engine. This is an engine-code-specific application, not a guarantee of fitment to every Jonway model or production year.
Kit includes
- Cylinder barrel
- Piston and piston rings
- Gudgeon/wrist pin and retaining circlips
- Top-end gaskets
Engine fitment
- Intended for compatible GY6 157QMJ 150cc engines used in selected Jonway vehicles
- Before purchase, confirm the 157QMJ engine stamp, original cylinder bore, piston pin, stud/bolt spacing, and cylinder-base fit
- Typical 157QMJ reference dimensions: 57.4 mm bore and 15 mm piston pin; these are not independently measured specifications of this supplied kit
- Do not assume compatibility with every 125cc engine, GY6B variant or 80 mm-pattern cylinder assembly
Suitable for engine top-end maintenance and repair where the existing cylinder and piston match. Compare photographs, included components and dimensions with the removed parts before ordering. Production-year compatibility is not established.