Chainsaw Repair

The problem being with those PTO side bearings is that they are radiused on the inner race  to fit the crankshaft which has a radioused shoulder where the bearing meets the crank .A standard metric bearing won't work .

To make matters worse the outer race on the outward side of the bearing is where the seal fits,not in the bearing pocket. They really went to extremes to assure propritory rights on those things .Thus instead of paying 10 bucks for a seal you pay 20 .