NU50 high RPM to start spin wheel

Eleazar Fulgencio /
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I have 1982 Honda Urban Express NU50. Engine sound good, celerate gradually when turned throttle but it almost half throttle to start running or spin the wheel. No modification made except changed the original belt drive to BX31. Its wide and it’s like shorter but I got it in. I just need some advised what to do.

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