I finally took all the good advice related to changing the crank seals on my 1979 Drifter 340 and now I cannot get it to run.
Here's the background. Owned the sled for about 5 years and it has always started cold on the 2nd pull and warm on the first. Last year I had one of the cylinders cutting in and out and thought I'd table it to this year. The other day, I pulled the motor, split the cases and put in new seals. Put some assembly grease on the new seals, sealed up the case and started reassembly. On the mag side when I previously had removed the flywheel, I had to pull the Cam (#37 in the manual) off of the crank shaft. I really didn't think anything of it but when I reassembled I noticed that the cam needed to be behind two small clips and appeared to sit within the flywheel which would be reassembled as one. I put the coil back where I had marked it. I thought to myself, that is strange, I'm surprised it ran at all with that cam placed as it was. Everything went back together fine. I had removed the carburetor (which looked good) and cleaned it well. Pulled about 50x with zero firing. I put in a tsp of premix down the spark plug hole and still zero firing. I also clipped off about 1/8 inch of the plug wire end and screwed it in fresh. Great spark on both sides. Still nothing. Swapped out plug/coils with right and left but no change.
Looking for ideas before I pull the motor and investigate further. My only current thought is I'm not delivering the spark at the correct time (and not even close). Also, 120psi on both sides and the crank seals, although a little stiff, looked pretty good to me.
Steve