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Reviews (13)

Jul 05, 2017
Exactly what i needed
This is the perfect ratio to get your 50cc scooter to do 50+mph. I installed these on a 2012 Zuma 50f (modfied) and I was able to hit over 50 mph where I was stuck at 45 on the rev limiter before. I didn't get an exact GPS verified speed sure to an injector malfunction, but my Speedo was totally buried as far as it could mechanically go, which is slightly over 45. I did verify my Speedo prior to the install and it was right on the money. The little scoot was still climbing hard with plenty more to go and I was already over 50 when the injector failed. The gears are definitely worth it and could possibly be used on a stock motor if you tune things right. I didn't notice any loss in acceleration, might have actually made it a tad better.

May 29, 2017
Well worth it but....
1 of 1 found this helpful It is definitely worth the purchase, although I fear that longevity may be an issue. Heat will be there enemy of this diff as it is made of fairly thin plastic. Once it breaks, I will be upgrading to a aluminum housing. Other than that, it's great!

Apr 03, 2017
It works
It's a great, inexpensive alternative to the Walbro 997. It's an identical carb without the identical price. Works perfect right out of the box, obviously you must tune it, and got my 30.5cc RC engine back up and running like a champ.