hi, I'm kind of at the beginner intermediate skill level mechanically and am thinking about taking the heads off for the first time ('89 Spada). It's running fine and stuff, I'd just like to clean out the cam chain tensioner piston and get rid of some top end rattle. Is it a bad idea to pull the heads off if the bike is otherwise running fine? I've been given the advice that if it's not broken I should leave it the fck alone (esp seeing as most bikes have a rattle of some sort), but that seems a bit limp. I've got all the manuals and stuff, from the diagrams it seems pretty straight forward. leave well enough alone or get into it? opinions?