I've got a late model "F" engined delux Lawnboy with 3-speed transmission and electric start that I bought as salvage. The con-rod is busted and the crank is scored. Suprisingly the cylinder bore is not scored. I would like to take the piston/rod/cranshaft out of another scrap "F" engine mower, a few years older, but still late enough to be compliance. I thought I read somewhere that ALL "F" engine internals were the same? Is that correct?