I had a Datsun 510 years ago that had one cylinder out of 4 that had little to no compression. It turned out that the head gasket was leaking and the rings on that cylinder were stuck. I drove it to the parts store and bought a can of Alemite Detergent Concentrate (CD2) and dumped the can into the crankcase in the parking lot, I then drove it 60 mph to the next town (15 miles, round trip) and ended up back at home where i changed the oil and filter. When I checked the compression again they were ALL good! And they stayed that way after I dealt with the head gasket issue.
About 5 years ago I had the rings seize (single cylinder and NO compression) on an air-cooled motorcycle engine due to starting and riding it with old, separated gas in the tank (I figured that the seizure came from running i until hot and then shutting it down and letting it cool). This time, I poured some CD2 into the sparkplug hole and kicked it over slowly 5 or 6 times, then let it sit for an hour or so. Dumped out the old 'gas', refilled with fresh and it started and ran as normal then.
The point being is that it's possible that your engine's ring are stuck also - due to many variables which may or may not exist now (Old, bad gas has been replaced, etc.). Good Luck to you! :)
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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