RBE17 Posted August 27, 2007 Share Posted August 27, 2007 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. Link to comment Share on other sites More sharing options...
olcowhand Posted August 27, 2007 Share Posted August 27, 2007 Sounds like it'd hafta be the spark plug with what you've said. Coulda just been a piece of carbon stuck in the electrodes. Link to comment Share on other sites More sharing options...
eagle5473 Posted August 27, 2007 Share Posted August 27, 2007 sounds like the plug to me too Link to comment Share on other sites More sharing options...
BenB Posted August 27, 2007 Share Posted August 27, 2007 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 Link to comment Share on other sites More sharing options...
RBE17 Posted August 28, 2007 Author Share Posted August 28, 2007 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. Link to comment Share on other sites More sharing options...
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