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Briefly, with the engine upgrade installed and the unit now broken in (over 300 miles on cylinder up...
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D. Franklin, Michigan
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49cc 50cc 150cc 250cc Motorscooters
49cc 4-st to 100cc Big Bore engine upgrade kit
[5:100upgradekit]
 MSRP: $235.00
 Our Price: $195.00
 You Save: $40.00
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The engine upgrade kit will virtually double your horsepower taking the engine from 49cc's to 100cc's. The effect will be additional 5-20 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.

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.....

Available in 64mm and 69mm valve sizes.  Select the correct model below

 

100cc Big Bore Kit for QMB139 50cc Engines

 

 

Available in 64mm and 69mm valve sizes.  Select the correct model below


For Your 49cc 4-st to 100cc Big Bore engine upgrade kit
[5:100upgradekit]
Available Options:
Valve Size:
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DISCLAIMER: we make this article and many of these parts available to you because many of our customers have requested them. Using them requires knowledge of how a CVT transmission works. Since small modifications cause big changes and many variables are involved; we will not offer any technical assistance for parts listed in this section. If you are not sure that you can install and adjust your transmission for maximum performance, do not purchase these parts. Thank you for your understanding. Please note: high performance parts carry no warranty period! All high performance parts are for off-road use only and are not intended for legal street use. Use of any of these parts on public highways may be illegal. Installation of any of these parts may void your factory warranty. In addition, the high performance parts may produce more power than the bike was originally intended for. In other words, use at your own risk.!!!! We make no warranty to products distributed, expressed or implied, including and without limitation any warranties or merchantability and fitness for a particular purpose. We will pass on all warranties made by the manufacturer (if any) who has the sole responsibility for performing such warranties. The manufacturer shall be solely responsible for any damage to person or property arising from the design, manufacture and testing of its products and ScootsUSA accepts no liability for such damages and shall not be liable for indirect or consequential damages. Riding a motor scooter can be dangerous. Riding a really fast motor scooter can be really dangerous. Always wear a helmet. Have fun!


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