Scooter Big Bore Kit 72cc GY6 QMB139 Four Stroke Review
72cc GY6 QMB139 Four Stroke Big Bore Kit 72cc 47mm Increase Power by up to 30% and torque by up to 50% Each kit includes: Milled Cylinder Emissions style Head with 18mm intake 16mm exhaust and high performance springs Cylinder, piston, piston rings, piston pin, and clips Top end gaskets Performance Camshaft (not shown but is included) with 4.75mm intake stroke 4.55 exhaust and 123 degree lift angle Read more...
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