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No exact answer as there is variables like weight , tire size ETC . Many have 8 to 9 HP while my Echarm which is a liquid cooled 150 with Ducatti EFI instead of a carb puts out 12 HP and has tall 16 inch wheels . Stock it did 65 when new then 70 after break in . I replaced the rollers with sliders and it went up to 75 MPH . I got a ticket for going 72 MPH . So far I have dusted every 150 I raced even when I had a passenger . I had 12g sliders and I will try 13g soon since mine are worn down .
Now if you really want a small pocket rocket get a 2T scoot with a Minarelli also called JOG ( Yamaha design ) engine as there is boocoos of performance goodies and I can go 50+ MPH up a large steep hill . A 2T will outrun a 4T all day long except those that are chain driven since there are single geared where a CVT has gear like effects with the belt expanding
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