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The engine upgrade kit will almost double your horsepower taking the engine from 49cc's to 80cc's. The effect will be additional 5-15 mph and more power. The kit includes everything needed including a new cylinder head, wider piston, rings, fuel and exhaust valves and valve springs and the necessary gaskets to do this upgrade using your existing head assembly. Installation of the kit does require some special tools and small motor experience, we strongly recommend someone who has small engine experience do the work. This kit is made for the 139QMB engines (and clones) and will fit the Avispa, Sports Edition, Cruising Edition, Scorpione, Retro Sport 50, (and clones). The QMB139 49/50cc engine is used on virtually all 49cc, 4-stroke imported scooters regardless of the Brand/model, body type, name or manufacturer. Baja SC50, Strada RX 50, Jalon JL50QT-21, Falcon and JL50QT-15, JL50QT-16,Strada RX 50, Jalon JL50QT-21 , JL50QT-15, JL50QT-16, JL50QT-18, Pantera Freedom, Fusion and Retro, Verucci 4s,10A,10D,RetroSport, Avispa, Sports Edition, Sunl SL50QT-16, SL50QT-16, SL50QT-18, SL50QT-2, SL50QT-3, Roketa Bahama, Maui, Sicily, Tank, Baotian 50QT-9, Baotian, 50QT-11, Dotera 50QT-11, Jalon JL50QT-18, Sinski XSJ50QT-6, Sinski XSJ50QT-B, Taishan Commuter, Taishan Sport Zhong Hu 50cc 4t, most Jonway, Tank, Lance Powersports and many more.....
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