Originally Posted by
grizz1
Not sure. I've never been one for swapping old things into new, or new things into old.
By using mis-matched parts you will never know if your getting 100% out of the engine or not.
Just go with what the factory put together as far as sleeves / crankcases etc. They matched those parts for a reason.....
I see, is the new 5 port (red cooling head with bigger crancase cover) have new sleeve porting, i suspect it use old 21-2205 p/s/c