> jim jim Wrote:
> -------------------------------------------------------
> my main concern is that the crankshaft will increase the rpms and that
> the piston will get a hard time coping with the high rpms. i dont know
> if this is true or not but that's what i've been thinkng. plus my bike
> had a bogging problem and it had to do with a bent crank, mechaninc
> "fixed" my crank and replaced piston, carburetor apparently(which i dont
> think he did) and the problem was there still. he managed to fix the
> bogging problem and he didnt give me an exact answer as to which was the
> problem. point is: i think he replaced my cdi to an unredtricted one,
> because my bike achieves a max rpm count of 10-10.500 rpm. that's why
> i've been thinking that if i install a racing crank the rpms will
> increase more and the piston will fail. might be a wrong carburettor
> tune but i think its unlikely.
The racing crank will not increase anything in and of itself. It is just made of a better alloy, with better bearings. Changing a crank out would not be the catalyst in blowing up your engine. Bad tune, airleaks, and bad timing would all do that.