Bearings for China doll engines

6202 are the bearings you need. I prefer deep groove bearings like these:
http://www.ebay.com/itm/QTY-10-6202...=BI_Heavy_Equipment_Parts&hash=item3f3ef0dfb7

These look pretty good. http://www.sears.com/nachi-6202-nac...21666&cpncode=38-15946430-2&redirectType=SRDT

SKF 6202-2RS-C3 are very nice too.

I like the dual sealed SKF bearings in mine too, just remove the inner facing seal at the crank and leave both seals on the clutch shaft. My thinking here is leaving the outer facing seal in place on the crank bearings adds an extra line of defense for air leaks at the crank seals if the bearing seals can do some or most of the work, the bearings will get plenty enough lube from the fuel oil mix by removing the inner facing seal.

Pretty much any of the higher quality brand 6202 c3 type bearings will be better than stock, I just prefer the SKF brand, but others like Federal Mogul and a few others are just as good and I'll use if I can't get the SKF brand for some reason.