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Rolling Wrench

Minarelli 2-stroke 70cc big bore kit 10mm pin

Minarelli 2-stroke 70cc big bore kit 10mm pin

Regular price $175.00 USD
Regular price $200.00 USD Sale price $175.00 USD
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Shipping calculated at checkout.


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. 


steel cylinder

Aluminum cylinder head


  • Wrist Pin Diameter: 10mm
  • Wrist Pin Length: 38mm
  • Displacement: 70cc
  • Fits 1PE40QMB Minarelli based engines with 10mm wrist pin
  • Piston Diameter: 47mm
  • Overall Height (cylinder): 87mm
  • Includes Wrist Pin Bearing

Supported models:

Yamaha Zuma 50 YW50 This will not fit zuma 96-01 models

Vino 2T


Yamaha Jog 50 1991-2001
 Axis Breeze
Vento Triton Zip
TNG LS49 Venice
Adly: Fox, Jet, Noble, Thunderbike,
Malaguti: F10, F12, F15, Fire fox, Yesterday,
most Chinese two stroke scooters
BWS 2002-2011

United Motors X-Speed 50 (00-05)

Vento Triton Zip 50

Strada 50

Muz 50

Mosquito 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

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