rattling noise could be SO many things, we need more info to help yah out. (location, engine noise, suspension noise, ect.)
YES, these quads run really hot, espesh if its hot out. Look to installing an oil cooler, it will help.
SO, trying to find TDC now, i am concerned to make sure I have it exact. I called Vitos and talked to them and they gave me a few ways to find it, but now that I have it all bolted back together, my best bet is to have one of you guys measure your new TDC mark or to make a piston stop and figure...