i just finished putting the bearings in my 125 Ron and i didnt even need to use a hammer on the main just pushed the crank (with the bearing on it) right on in, man what a piece of cake,

Ps. just make sure that you dont screw up the seal on the front bearing when knocking it home[X(].i cut the end of a wooden broom handle,(a dowl the size of the bearing would be better) to knock it in.(not hatd)

both 100 and 125 ran great when i fired them up WHEW!!!!!