Losing Power

Ryan Frost /
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i have a Malaguti F12 Phantom AC 50 which i have upgraded to a 70cc changed the clutch for a polini race clutch and replaced the belt for a kevlar race belt, ive also put a stage 6 race pipe on it and after tuned the carb so its running right, so now you know what ive done to it, the problem is that it doesnt rev up at all when your it and it only does about 22mph but if i go down a very steep hill ill get 80 mph so i cant figure it out ?? help!!

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