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
70cc Big Bore Cylinder for MBK Booster 50 Booster Road 50cc 47mm/10mm|big bore cylinder|70cc big borebig bore - AliExpress
9931370 THERMAL GROUP CYLINDER KIT TOP BLACK TROPHY 70CC MBK BOOSTER SPIRIT 50 | eBay
Mbk Booster Spirit 12 Inches | Mbk Booster 50cc Scooters | Mbk Booster 50 Scooter - Engines Big Bore & Top End Kits - Aliexpress
Set Unit Cylinder DR 70CC Evolution MBK Booster Rocket Spirit Stunt DM 47MM | eBay