300ex crankshaft into 250x

[stromgren188]

Does anybody know if a 300ex crankshaft will work in a 250x engine

[bwamos]

I beleive so.
But, you WILL have to use a 300ex rod and piston as well, or you'r piston is going to be smacking the head since it has a longer stroke. ;)

The question is why would you want to? The 250x IMHO is the better engine. If your willing to put that much work and cash into the engine for a negligible increase in power, why not put a 350x engine in?

[stromgren188]

it is torn down right now and the powroll stroker is a little spendy...then i realized a 300ex basicly same motor longer stroker....8 mm stroker not to expensive..figured it was something i should check into before putting the whole thing back together

[stromgren188]

so i heard that the shaft may be different because of the electric start???anybody know??