80cc Big Bore Kit, with 64mm Valves 

This kit fits most Chinese Scooters/Mopeds with 50cc, 60cc 4-Stroke GY6/QMB139 engines!!!  This will increase your powerband anywhere from 50-75% so be ready to go faster!!!  Included in this big bore set is:

For a kit with 69mm Valves, Please Click Here!

• 1x Cylinder
• 1x Head Assembly, 64mm valves
• 1x Piston: 47.7mm
• 1x Wrist Pin
• 2x Head Gaskets
• Complete Ring Set

Fits: Alpha sports, Avanti, Baja, Bam X, Baotian, Bashan, BMS, BMX, Boreem, CF Moto, Cross Runner, CoolSports, Diamo, E Ton, Eagle, Fushin, Fly, GMI,  Hensim, Hi-bird, Ice Bear, Jackel, Jet Moto, JCL, JM Star, Jonway, Kazuma, Keeway, Kinroad, KMD, Kymco, Lance, Lifan, Linhai, Loncin, Longbo, Maxtrade, MDI, Meitien, Motofino, Motorino, NST, Panterra, Panther, Peace Sports, Red Streak, Redcat, Roketa, Schwinn, Strada, Sunl, SYM, Tank, Tao Tao, Terminator, Tomberlin, TNG, United Motors, Vento, Verucci, Wildfire, X-Treme, Yamati, ZNEN, and Zongshen!