Chainsaw Repair

Tough to answer questions like this when it's on someone elses bench and you can't hear it yourself. No idle is usually one of 2 things. Loading up; meaning too much fuel. Or running out of fuel; leaning out in the idle circuit on the lo side of the carb. If not the carb itself, an air leak on the intake can cause this.

But in this case, I suspect the top end from Amazon may have burned up already.  If all was well when it left your shop and the problem appeared when it shut down after it got good and hot, first thing I'd do is to check that cylinder/compression first. If it's OK, then we can look for carb or air leak problems. Always need to know why the original cylinder failed before replacing a top end. 346/353 bottom ends rarely have issues ; it's almost always intake/fuel related.

I'm assuming here that you used an inexpensive top end, not an OEM one from Husky. Sometimes they work, sometimes they don't. An OEM 346 kit only costs about $110 and bolts right on a 353 with no other changes.

Re-eading this, I see that I missed the part about the saw still running OK at full throttle. Sometimes these early morning posts.......sorry. That cylinder starting to fail is less likely, but I'd still have another look at it to be sure, because of that shut down after getting hot deal. Does it run OK at full throttle for a short burst or does it continue to run good while actually working it? If the cylinder is good, it could still be a carb issue. Not all carbs respond to a rebuild. But they are too pricey to take a guess. Do you have another carb layng around to try?

One little part that often gets overlooked on the intake is the small impulse line from the partition wall to the boot flange. Becuase 346/353 bottom ends almost never fail I do get lazy and usually do a rebuild without checking them. Idealy, the right way to do any saw is to do a vac/pressure test before even taking it apart. But after a while, you get to know the tendencies of the various models and some you do right away, and others you're not as concerned about.

Was following.

Thanks for posting findings and fix.