Mini chopper

#1
Hey new here and I have a mini chopper that was originally a 49cc . I'm wanting to build it for speed not really looks and wondering if I would have to modify the frame to put a 670 or am I wanting to do something that's impossible. Thank you for your time
 

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#2
Hello and welcome!

I imagine you would need to modify the frame quite a bit. If you're a skilled fabricator / welder, you should be able to do it. That appears to be in decent shape except for the fork tubes, they're shot.

A Lifan 250cc v-twin would give you around 16-18 HP, a multi-plate wet clutch and 5-speed transmission. It's basically the same engine used in the Yamaha Virago / V Star 250 and Voger / Naja.

https://www.yamahamotorsports.com/models/v-star-250

https://vogermotor.com/voger/

https://vogermotor.com/naja/

Voger Naja.png
 
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