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CCKB Troubleshooting Questions?

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I've actually fixed the problem, but I was hoping some of the more experienced members could offer their advice I how they would proceed. Background: 9020 w/ a CCKB. Two weeks ago it was running fine and all of a sudden it started belching black smoke and barely running. I nursed it back to the barn and assumed it was a carb problem. I ordered a service kit and planned to do the carb work yesterday. I started the motor to check the timing. I shut it off after a couple of minutes because it was jumping all around and I couldn't get it to idle. While fumbling around, I brushed the #1 exhaust pipe, no big deal. I then bumped #2 and realized how hot it was compared to #1. Ok, #1 is not firing. Troubleshooting: Spark at both connections on coil. Both connections will fire #2 cylinder. I switch wires on the coil and #2 always fires and #1 will not. I try a different plug wire for #1, same result. Both cylinders have compression and plenty of fuel. I remove intake and exhaust and verify all four valves are moving. Diagnosis: Please tell suggest what you would do next and why? I've fixed the problem, but I was shooting in the dark and throwing parts at it. All input is appreciated. Thanks, Steve.

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Steve I also believe it is a fouled spark plug. Sometimes mine does the same thing, usually on start up. If one head is warm/hot and the other cold, I know that the plug on cold side is not firing. I had a snow mobile that would also foul plugs. In 35 years I have never had a chainsaw foul plugs. Wonder why some engines have this problem and others do not, even though the timing and carb seems to be set properly? Ben

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Gentleman, I forgot to add that I changed the plugs w/ the same result. I kind of was at a loss after all of that. I changed the points, condensor and timed it and now it runs like a champ, sort of. The compression on both cylinders is only 60psi:O Thanks for the replies. Later, Steve.

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