Doing the bottom end on my 07 450. It was making quite a racket all of a sudden and I found there to be .003 endplay in the crank, doesnt seem like much but it cant be any good. Is that enough to cause a bad rattling noise? I also need to know if the piston pin is supposed to be a slide fit or tight fit? Thanks ps also wondering if its easier to put the top end on after I bolt the bottom end in the frame... or can I just build the whole thing and it fits back in ok?