Sgt Bull...yes, repeated checks of timing, mag rotation, and firing order. I had resurrected this unit earlier in the year, and got very familiar with mag issues.
Compression check gave me 45-45-45-35. The one with the 35, cyl #4, was actually one that was firing well...plug came out clean and light brown.
The firing order suggests that power stroke and intake of adjacent cylinders is when #2 & 3 fire. They showed 45 psi...no pressure leak shows there.
The valve action seemed normal, did not see a broken spring, clearance was correct.
When I had it running months ago, it smoked at startups, and after idling, indicating bad guides. Not too much blowby, as with a broken ring.
It seemed to be occasionally spewing out the intake tube when I was battery cranking it, when it coughed. Almost a geyser when pulling it and trying to run it. It geysered mostly when the engine was beginning to fire.
I'm willing to retest everything before pullng the head, so I'll give it the once-over in the morning.
In general, it could be a sticking intake valve, a head gasket leak, or any variation on these.
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