I am in need of a rear bearing for a Collari .21 engine.
I believe the one I have is the same one mentioned above, and has a Sirio counterpart. It was sold with a wooden box and has the alum sleave with heat sink fins, that bolts to the crankcase. The rear bearing is an oddball size;
14.2 X 25.3 X 6mm with a 6.3mm wide inner race (extension on one side).
Anyone know of a source?