Hey,
I got an old SR series OS engine which was rusted and locked. Finally after soaking it in WD-40 for 4 days, i got it moving. However, the rotation is not smooth. I can still see brown (rust or what?) on the crankshaft. There's ALOT of it. The piston and sleeve is clean. Perhaps the bearing is bad? What else could be the reason that the rotation is not smooth as glass. Should i keep trying or throw away this 15 year old engine in the garbage. The compression seems good enough.
Thanks