Is your scooter to slow? Thats what I thought! This big bore kit will solve the problem of loosing speed going up hills, give you about twice the acceleration power, and even give you a higher top speed. You can't go wrong upgrading your engine to 70cc. One important detail you must know is your stock scooter has a 50cc oil pump installed on it from the factory. This pumps 2-stroke oil into your engine automatically as you ride. When installing a 70cc big bore kit you must add about a tablespoon (about a cap full from your 2t oil bottle) of oil when you fill your gas up. This will insure your now 70cc engine is getting the proper oil amount.
This kit will work on all Jog/Minarelli (or 40QMB engines. This number can be found on the left side of the engine case) 2-stroke engines with a 10mm piston pin. If you are unsure what you have let us know your model in the comment section at check out.
Also, don't forget when putting a larger cylinder on your scooter, to upjet your carburetor. We recommend starting your jetting rich and then working your way down to the perfect mix.
Aluminum cylinder head
Wrist Pin Diameter: 10mm
Wrist Pin Length: 38mm
Fits 1PE40QMB Minarelli based engines with 10mm wrist pin
- Piston Diameter: 47mm
- Overall Height (cylinder): 87mm
- Includes Wrist Pin Bearing
Yamaha Zuma 50 YW50 This will not fit zuma 96-01 models
Yamaha Jog 50 1991-2001
Vento Triton Zip
TNG LS49 Venice
Adly: Fox, Jet, Noble, Thunderbike,
Malaguti: F10, F12, F15, Fire fox, Yesterday,
most Chinese two stroke scooters
United Motors X-Speed 50 (00-05)
Vento Triton Zip 50
PGO -Genuine Buddy 50cc, Black Cat 50cc, and Rattler 50
Eton Beemer and Matrix 50
This kit will only work on scooters with a 10mm Wrist Pin.
If you want even more power check ut our stage 2 kit