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Too bad to hear this. The condor / X-Pro/Lifan/Vader 150 has more to give with an 18t front and 31t rear sprocket.
That's almost 1/3rd taller gears, meaning 1/3rd less rpm or it still should get you up to 60mph gps verified at ~6.5k rpm.
Change exhaust, carburetor, and intake, and it'll take you to 70.
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