Re: i have comp #'s happy memorial day
Compression values are a little low, but at least they're even. You're using a rope start, so I wouldn't expect huge numbers especially from a 40 yr old motor. Compression is probably okay.
Your latest cylinder drop test yielded results which may suggest your bottom cylinder has a weak spark, or no spark. That may lead you to your issue, and would certainly result in low rpm and low power. Could be intermittent, and more noticeable under load rather than on muffs or in a tank.
I'd investigate the condition of the spark plug wires and plugs, and only then move onward to pull the flywheel to review the ignition components. Try running that motor at night if you can to see if you can see any arching wires, especially on that bottom cylinder.
To check for spark strength, you can use a bolt in the spark plug boot while pull starting. Spark should be bright white/blue and be able to jump approx 3/8" to ground on the block. Might need an assistant for that test.
Many ignition parts for that motor are a bit pricey, but there is a good probability you need a new coil, breaker points, and/or condenser.
That flywheel can be removed with a three point puller, using 1/4" or 5/16" bolts in the flywheel (poor memory). Shaft is tapered, keyed. Loosen the flywheel nut a few turns, then tighten the puller, then tap lightly but firmly on the end of the puller and the flywheel should pop free (hopefully).
