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I am stumped. The blower starts easily and runs well for 5-10 minutes then bogs down under full throttle. I replaced the fuel filter assuming it was a fuel starvation issue. Didn’t solve it. I had an extra carb so switched it out. Same exact symptoms persisted. Tried adjusting the mixture screw, no difference. Changed the sparkplug, no difference. I put an inline spark detector on and ran it. Showed spark when it bogged down but not as bright, so installed a new coil. Same symptoms. The fuel is fresh. The air filter is clean, almost brand new. Tried running it with the fuel cap loose and it still bogged down after a few minutes. Nothing has worked so far. Could the fuel line be collapsing? Anyone have any ideas? BTW, this has the newer carburetor.

Could be a plugged spark arrester, muffler, or exhaust port, check these first. Remove the muffler and try running to see if there is any change. Yes it is going to be loud.

Thx Rivets, will try that tomorrow at a decent hour. I forgot to post that I had checked the spark arrester screen. It was clean.

If the muffler gets eliminated as a cause, could there be something internal in the carb that would cause this, like a failing diaphragm? I can’t understand how a diaphragm would be ok for ten minutes and then quit. If it was bad, I would think that it wouldn’t pump from the start.

Oddjob said:

Thx Rivets, will try that tomorrow at a decent hour. I forgot to post that I had checked the spark arrester screen. It was clean.

If the muffler gets eliminated as a cause, could there be something internal in the carb that would cause this, like a failing diaphragm? I can’t understand how a diaphragm would be ok for ten minutes and then quit. If it was bad, I would think that it wouldn’t pump from the start.

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If the blower is getting up to speed fine, then it is not the spark arrestor.

You have replaced a lot of parts. Are the replacements OEM or aftermarket? How old is it?

I had this problem on my old chainsaw. After lots of aggravation , I discovered that the ends of the fuel lines weren’t fitting as tight as they once were, and was allowing tiny air bubbles to enter the line at full throttle. I replaced both fuel lines with high quality ethanol resistant lines and problem solved.

Tiger Small Engine said:

If the blower is getting up to speed fine, then it is not the spark arrestor.

You have replaced a lot of parts. Are the replacements OEM or aftermarket? How old is it?

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I think it is a 2022 model based on the appearance of the carburetor and what my daughter-in-law thought she remembered about when she bought it. The serial no. is 20223302062 but I couldn’t find a definitive way to read Husqvarna serial numbers for year of manufacture. One source said that Husqvarna uses the first two digits for year of manufacture but I am pretty sure it is not a 2020 model.

The filters are aftermarket. The spark plug was oem, the replacement was aftermarket. The carb that is on there now is the oem carb that I removed a year and a half ago when I had replaced crumbling fuel lines. The fuel line is what came with the aftermarket carb.

11 digit serial numbers
First 4 is year.
Next 2 is the week of the year.
The last five digits show the sequential production number (e.g., 00362 indicates the unit was number 362 in production order that week).

StarTech said:

11 digit serial numbers
First 4 is year.
Next 2 is the week of the year.
The last five digits show the sequential production number (e.g., 00362 indicates the unit was number 362 in production order that week).

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Thx.