Recently was gifted a 1980 QT50, non-running for 20+ years. The usual story: Lot's of bad varnished gas. I cleaned the tank and replaced the carb with aftermarket. I put a Niche 60cc piston/head kit on it. Ran like a champ for break-in and about 30 minutes. Unfortunately I believe it is soft seizing. I was hoping not to get into the crank seals but that's where I'm at today. I replaced the left side under the stator easy enough but I wrecked a new seal installing on the right side. There is the bushing/collar on the shaft and one end is beveled. I believe the beveled end faces into the motor. The collar that I'm referring to is #6 on the attached drawing.
I couldn't get the new seal on to the collar when the collar was already on the shaft. Is there a special order of installation? For instance, should I put the seal into the case and then insert the collar into the seal? This could make sense since the beveled edge would be the leading edge. Or would this wind up pushing the seal in too far?
Finally, how do you guys know for certain when your oil pump is working? I have no problems with premixing but I need to research how to delete the pump.