47mm / 10mm 70cc Big Bore Cylinder Kit & Cylinder Head Cap & High quality crankshaft for MBK Booster 50 Zoll Stunt 50 2T|cylinder kit|70cc big borebig bore - AliExpress
CYLINDER KIT AIRSAL T6 70CC AC MINARELLI VERTICAL-ALG-AS14256
70cc Cylinder Kit & Head 47mm piston kit set for YAMAHA Booster Stunt Bws50 BWS | eBay
Thermal Group 70cc Cylinder Scooter Diameter 47 Racing MBK Booster Spirit 50 2T : Amazon.de: Automotive
9931370 THERMAL GROUP CYLINDER KIT TOP BLACK TROPHY 70CC MBK BOOSTER SPIRIT 50 | eBay