Glixal ATMT1-100 GY6 QMB139 139QMB 139QMA 50cc Cam Timing Chain Tensioner for Chinese Scooter Moped ATV Go Kart Durable 50cc GY6 Tensioner Bolt Hole Spacing: 40mm Used for GY6 49cc 50cc 139QMB based Engine Please Check Pictures and Specifications for Compatibilit