Hey guys, I just joined cause I really need some help here. I just bought a 2007 Foreman 500 FM that needed to be bored out and new piston, rings, etc. I did all of that and replaced valve guide seals then put it all back together and it cranked up and there is this rattle sound and it smelled like burning metal. Then it started smoking a lil. Any clues as to what might be causing this? Any info would be much appreciated.