Originally posted by marcusgunby You cannot run a flat top piston in your bike unless you mod the head to suit.It will have low compression and not be optimised.
The reverse is also true...I put a stock domed piston in my 1998 KX250 when the Tom Morgan Racing head mods called for a flat top piston. The result...it ran fine, but had lower compression than expected. Eric Gorr confirmed this per a telephone call.