fatboycowen
Well-Known OPE Member
I've got a 580bts. It's about 3 years old, and it is only used by me, on my property. I'd guess I've got 10-15 tanks through it, so it's not that well used.
Recently, it developed a misfire. I'm having trouble diagnosing.
Starts normally. I usually let it idle a few minutes before using it. I'll start blowing leaves, and within a few minutes, it starts misfiring at high rpm. Just a constant, or on-off misfire. It continues to run, just with a high RPM stutter, that reduces the RPM.
I changed out the spark plug, fuel line, fuel filter. I pulled the air filter (very clean). I pulled off the carb, and muffler. Muffler is not plugged up. Piston/cylinder look mint. It seems like it has great compression. I made sure the carb was sealing against the intake.
I ordered a carb kit. Though, I'd hope it wouldn't need it, as it's only had non-ethanol fuel since day 1.
The ONLY thing that i can think of is ignition related. I noticed the spark plug wire had some light chafing, where it goes over the cylinder cover. Somehow, the grommet disappeared. So, i ran it for a while without the cover on, so i could monkey with the wires. The misfire comes and goes. Moving around the wires doesn't seem to be effective.
Thoughts?
Thanks,
Jon
Recently, it developed a misfire. I'm having trouble diagnosing.
Starts normally. I usually let it idle a few minutes before using it. I'll start blowing leaves, and within a few minutes, it starts misfiring at high rpm. Just a constant, or on-off misfire. It continues to run, just with a high RPM stutter, that reduces the RPM.
I changed out the spark plug, fuel line, fuel filter. I pulled the air filter (very clean). I pulled off the carb, and muffler. Muffler is not plugged up. Piston/cylinder look mint. It seems like it has great compression. I made sure the carb was sealing against the intake.
I ordered a carb kit. Though, I'd hope it wouldn't need it, as it's only had non-ethanol fuel since day 1.
The ONLY thing that i can think of is ignition related. I noticed the spark plug wire had some light chafing, where it goes over the cylinder cover. Somehow, the grommet disappeared. So, i ran it for a while without the cover on, so i could monkey with the wires. The misfire comes and goes. Moving around the wires doesn't seem to be effective.
Thoughts?
Thanks,
Jon