hey guys i split my case this evening and have couple questions my crank bearing on the clutch side appears to b in good shape it spins freely and does not have any play from side to side but makes a slight noise when i spin it and didnt kno if this is normal and ok?? should i replace it? also the bearing reads japan koyo 63 28 anybody tell me if thats oem?? is there anything i should look for or inspect or any little tricks i should kno about before putting it all back together?? oh and one more thing on the crank its self there is a little bit almost rainbow coloring in a small circle around the shaft of the crank "not the rod" the part that goes into the bearing i dont think there is anything wrong w it maybe it just got hot on a previous build ? just thought maybe i could get some good info. thanks! i can post pics if needed