Blue Line Big Bore Kit w/ Head 4T (72cc, 64mm Valves); 139QMB scooter 170 This 52mm cast iron cylinder

This 52mm cast iron cylinder is designed for riders who demand the maximum displacement possible from the 139QMB platform

waterproof nylon

-Available for low profile sport tire applications

Vee Moto has grown to produce more than 25 million tires annually under strict quality standards

Blue Line Big Bore Kit w/ Head 4T (72cc, 64mm Valves); 139QMB scooter 170 This 52mm cast iron cylinderBlue Line Complete 72cc High Performance Big Bore Cylinder Kit for 50cc 4 stroke 139QMB engines. Original Parts For Scooters SKU 151 280 47mm NOTE: Before ordering, remove the valve from your scooter's head and measure the full length of the valve stem. This kit works with 64mm valves. If your scooter has 69mm valves, you'll need the following 69mm big bore kit. Pump up that weak engine to a respectable 72cc displacement, on a budget. This kit is not