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My 50cc Aprilia SR50 can hit 60-65. All I need to do is poop before hand and make sure it’s a tailwind I’m running with.

when I went to a bigger 80cc kit, I could do upwards of 70. But more importantly I could hit 60 with ease without the aforementioned poop.

Of course it took quite a bit of tuning to get there from gearing, pulleys, weights, springs, fueling, etc. It sounds like a million angry bees when WOT.
 
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