Slow derbi variant pp??

austin hunt /
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Bike runs very well idles well and has a lot of low end power... pulls solid up to 30 mph... it’s not reving up like I believe it should won’t rev on the stand very high... all stock other then shaved Restrictor off the variator 15:15 carb no intake Restrictor has custom Variator weights 3.5 grams lighter then stock not sure where to go from here stator is in the Original spot from the factory cleaned out the pipe also what I’m getting at here is why won’t it rev like I believe it should should be closer to 40 at least !

3B75D043-1C26-4858-9DFD-FD246ED19A22.jpeg
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