So I bought my son a 09 90cc raptor from an auction you got to listen to all the machines run but couldn't drive so I bought for 700 in near perfect shape runs good only problem is when u take off it sounds like its eating its self alive so I pulled trans oil little milky so opens up trans all bearings look good removed belt noise still there drained engine oil absolutely no metal or debris crank doesn't have play side to side or up and down so I replaced starter clutch 1 way bearing shim and rollers still noisly it runs to good to be valve or chain noise if any body has 1 apart id love To see a pic of the splines on left side of crank or if anybody has had this kind of problem I need help it runs and moves just sounds terrible so kids don't get to ride