anyone got a engine break down picture ?
bearing
it looks like the gold part in a sealed bearing
water pump been apart or kick start ?
http://www.betamotor.com/system/attachment...t_07_motore.pdf
if you have had head off it could be the bearing by the cam chain page 10 number 14 or 20 or if you mesure what you have and add about 5mm it might rule some of them out i think kick start is best place to start