Author Topic: Pulling my hair out - Rebuild of 353  (Read 28 times)

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Offline RevolutionRepairs

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Pulling my hair out - Rebuild of 353
« on: July 04, 2020, 11:35:55 am »
Hi All......New here and seeking advice please.

I'm in too deep now to quit on my neighbours saw rebuild.  Its an older 353 but in good shape but had running issues.  Piston was all scored up so I bought a cylinder and piston kit form Amazon.  All went well and Jim reported the saw ran well until it stalled when good and hot and was difficult if not impossible to start again.  So I had it back and thought it maybe sucking air from the intake system.  Ordered OEM intake bellow and the rest of what is between the carb and the cylinder.

Now I'm having idle issues.  So i rebuilt the carb with a Zama kit.  I can start it OK if I have my finger on the gas but no way can I set the idle to stop it staling when it been running a while.  Runs fine at full throttle.

Have replace the plug, fuel line and filter too.

Basically its a total rebuild but the idle issue is bugging me.......Any ideas please.

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Offline Spike60

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Re: Pulling my hair out - Rebuild of 353
« Reply #1 on: July 06, 2020, 06:20:36 am »
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.
Husqvarna-Jonsered

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Offline 3000 FPS

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Re: Pulling my hair out - Rebuild of 353
« Reply #2 on: July 06, 2020, 10:59:33 am »
I was just wondering if the crank seals were replaced at the same time you did the piston and cylinder.   
I would go back to the beginning and start checking for air leaks and then go from there.   
PP 505, 475, 445.

 

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