If it turns over, that is a good sign. I usually just squirt fuel on the front bearing, and into the muffler with the nose pointing down, and the exh port closed. Then dump it. A bit of a squirt into the carb, and flop the prop back and forth a bit till it feels sloppy. If it is good, then I fire it up. If it is very stiff and I feel industrious, or it is a swap meet motor, I will take off the backplate and check to see if the wristpin is slipping on the rod, and not the piston. I have only needed to replace bearings twice. Maybe I am not fussy enough, or too lazy? I have lots of motors that seem to work ok. 8 years is not really that long if it did not get rusty from moisture. Sometimes the carb locks up too. Fuel, and/or a heat gun usually solve that.