well as far as seals go, i guess i will have to call the manufacturer, because i cant find them online. I never messed with the shims, I did remove the cooling head one time. I tried to put it back on, it wasnt going to well, so i took it up to my LHS. The guy tightened it up for me but i never did really check to see if it was sealed. The whole reason i took it off was because i had left the piston in TDC like idiot..... and what i did was take the cooling head off put some after run oil in, and free the piston with my finger. look back now i know what i should have done but its a little late for that now........