A lot. You would have to be 511cc to be illegalAnyone remember how many overbores you can go on a TRX250R before its illegal ?
I thought 255cc was the limit for the Honda 2 strokes ? Where's Tim he might know...A lot. You would have to be 511cc to be illegal
Unless your referring to staying under the original combination before going into the 430 weight zone?
If that's the case, I think its 310? But don't quote me on that just yet
cr250 are 2 stroke dirt bike engines. the trx250r was the old faithful 2stroke quads that everyone went crazy with on the racing scene. made from 86 to 89. The rules say max 255cc on the 2strokes. A 67.5 bore with stock stroke comes to 257.65 so has to be under a 1.5 over for sure. Don't know the exacts for 255 but hope this helps ya.cr250 are the 4strokes , like jimbos old motor. TRX250r were Hondas 2 Strokes...sorry Bobby I didnt clarify that.