I just went out and got new bearings from a bearing shop. They're the correct size, and the fit perfectly, but it has me worried.
Im upgrading my Minarelli V1 to an 80cc kit. The old bearings have little play but they grind a little. The new bearings have more play though. Enough play that when you shake them you can hear them rattle a little.
I picked them up from a bearing shop and I'm not sure if there was a situation where i got "regular" 6203 bearings but "crankshaft" 6203 bearings have closer tolerance, or if more tolerance is actually good cause it allows more oil into the bearing, or what?