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Can you diagnose my Stihl by listening to it?
- Thread starter aboekman
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SteveSr
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Just pull the AF cover off and watch the choke flap lever on the air filter when it is acting up at full throttle. The lever shouldn't move. If it does you need a new air filter with the proper spring tension for the choke shutter! No more aftermarket here!
Forgot about weak spring in air filter choke as a possibility.
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SteveSr
Addicted to ArboristSite
I ran into one of these once. From what I could tell it was a genuine Stihl filter. Must have had a batch of bad springs.
Really interesting! Plug, coil or flywheel? . It’s very consistently inconsistent. Looking forward to hearing what is causing it!
Short timer
Wish you'd stop being so good to me captain
100% it’s in the ignition circuit. Coil, ignition lead, plug, kill switch, or kill switch wiring. No way fuel would cut it out that abruptly and intermittently, you would get more of a bog.
Start with a new plug.
Start with a new plug.
Yup.
I was first shown that working on cars back in the 1970s. An old chevy, with points ignition , looked like a Christmas light display in the dark. Wires and distributor cap were shot.
On a saw, putting the plug boot back on, rates right up there with the first time you replace an oil pump line on a 026/036/044/066.........
Maybe the old sages, here could enlighten us on their favorite methods to get the coil wire boot back on?
aboekman
ArboristSite Lurker
Ok. I tried richening the two carb screws, no change. Ran it without the filter, no change. I inspected the coil and kill switch wires and they look tight with no fraying. The kill switch is working well and nothing looks shorted around it. The plug is brand new. The gas is brand new and mixed properly. I'm going to test the resistence of the coil next and clean it really well.
While you are checking coil, check that it's metal mounting housing had good ground to cylinder.
aboekman
ArboristSite Lurker
FWIW, the coil has 1.3k ohm between the spark plug boot and coil. Kill switch leads are 160 ohm when killed and no connectivity when running.
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Pop the carb and muffler off and inspect both sides of the piston. I am guessing that the intake side is boogered.
My suggestions don't cost any money, and can save a lot of time.
My suggestions don't cost any money, and can save a lot of time.
Ax-man
Addicted to ArboristSite
Does the spark wire unscrew from the module on those 026's ?? I have seen corrosion on the inside of the module where the spark wire screws into it.
aboekman
ArboristSite Lurker
No, it doesnt.
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It doesn't?
your peculiar humour cracks me up Harley
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aboekman
ArboristSite Lurker
I removed the coil and cleaned everything. I replaced it using a business card in the air gap. I ran it in the dark and no sparks were leaking. Everything looks tight and fairly clean. It fires up and idles beautifully but is otherwise running exactly the same as it did. Here's what it looks like...maybe you'll see something.
I also took a peek at the piston. I confess I'm not sure how to spot a "boogered" piston but I'm familiar with boogers and the piston didn't have any. There's some faint lines in the piston but they look more like stains than scores.
I also took a peek at the piston. I confess I'm not sure how to spot a "boogered" piston but I'm familiar with boogers and the piston didn't have any. There's some faint lines in the piston but they look more like stains than scores.
Did you inspect the spark screen in the muffler? Maybe it’s plugged
