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I want to purchase an RS50 with a knackered motor and replace it with a 125cc 4 stroke or 2 stroke dirtbike engine. I don't really know how hard it will be. I do know that if it works I'll have one fast little sport bike to tear up the streets of manhattan with. I also don't really know how much it would cost. Any comments or info would be appreciated.
 

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i think a ysr50 would be easier. just because i know it's been done. i saw a yz500 powered ysr. never saw anyone try it with the rs50
 

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did you do it?

Did you buy a rs50 to do the conversion?

There are a lot of guys doing RS50 motor swaps these days (yz125, kx250, and I think even a crf450) so the info is available if needed. You can get details on the apriliaforum.com messageboard.
 
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