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Aaron, I think ULWSV is the bump class for 250gp. Of course you'd have to have a drum to run in GP. But you could run 250cc and get the hp you need.
In my opinion you'd have to go two stroke to be competitive at 200cc and far as I know there is no handicap for 4 strokes....except running a 250cc GP machine.
I was talking to Mike Elliot the other day, and he's looking to build a Yamaha RT-1 roadracer. Single cylinder 350cc two stroke. Neat idea. Might want to check out the two-stroke dirtbikes of that era and see what might work.
 
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