Product Review

100cc big bore performance upgrade engine kits with cylinder head. For GY6 50CC engine upgrade. Why Settle for 50cc or Even 80cc now you can almost double your power with this 100cc conversion Kit. It comes with everything you need to turn your 50cc Scooter into a 100CC ! Dealers make money with this kit, this item is hot, This kit fits with most Chinese Scooters/Mopeds with 50cc, 60cc, 70cc, 90cc 4-Stroke GY6/139QMB engines!!! This bore kit can rebuild your 50cc 60cc 70cc 90cc bike to 100cc. This will increase your powerband anywhere from 50-75% so be ready to go faster!!! Included in this big bore set is: • Cylinder Engine Head, (69mm valves) • Cylinder (50mm ID) • Piston (50mm OD) • Wrist Pin • Complete Gaskets Set • Complete Ring Set • Qmb139 Roller Weights,16*13 • Oil Pump (42.5mm bolt hole spacing) Please carefully check your cylinder valve status BEFORE you place order. 88807 is for 69mm long valve version, (if you need 64mm version, please refer to the item NO.:70002)