Originally Posted by
ScottyM
They should be 6.3mm. I ordered two TKO ceramics in 25.3x14.2x6.3 for my Discovery engines. I hope to install them Firday afternoon. I'll let ya know if they work.. Bearing sizes should be the same for all the Alpha line of Orion engines.
i have lost both rear bearings in my b5 pro n crf tebo .. i heard the tko ceramic bearings are very good but the inner race of this size bearing is a little on the tighter fitting side on the werks crank .. but if the bearings are same size den it shud be a tight fit on orion too .. funny thing is i tried to put the werks crank in the orion rear bearing and it dint fit but orion crank fit on the werks bearing even aftr both being same size .. dats why i was confused .. do let us know if the inner race of the tko is tight or ok fitting in the orion.