GY6 49cc-100cc (QMB139) - Crankcase & Gasket

Crankcases and gaskets for GY6 49cc–100cc (QMB139) engines provide the essential sealing and structural support needed for smooth operation on most Chinese 49–80cc scooters. Over time, impacts, stripped threads, or oil leaks can compromise the crankcase, while aging gaskets may allow pressure loss or contamination. Replacing these components on scooters such as TaoTao, Peace Sports, and Jonway helps restore proper sealing, maintain lubrication, and protect internal engine parts, ensuring dependable performance and longer engine life.