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#Post#: 86913--------------------------------------------------
Pulling my hair out - Rebuild of 353
DIR By: RevolutionRepairs
Date: July 4, 2020, 10:35 am
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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.
#Post#: 86915--------------------------------------------------
Re: Pulling my hair out - Rebuild of 353
DIR By: Spike60
Date: July 6, 2020, 5:20 am
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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.
#Post#: 86919--------------------------------------------------
Re: Pulling my hair out - Rebuild of 353
DIR By: 3000 FPS
Date: July 6, 2020, 9:59 am
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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.
#Post#: 86926--------------------------------------------------
Re: Pulling my hair out - Rebuild of 353
DIR By: Spike60
Date: July 8, 2020, 5:32 am
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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.
#Post#: 86930--------------------------------------------------
Re: Pulling my hair out - Rebuild of 353
DIR By: RevolutionRepairs
Date: July 9, 2020, 9:39 am
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Thanks for the replies Peeps....I got into it a bit more
yesterday. The cylinder seems perfect. I rechecked all I have
done and noticed the spark was kind of weak. I re-gapped the
coil as it seemed a little wide and the spark did not visibly
get any better.
I dug out the oil coil which at the time of removal was buried
in oil and saw dust. I suspected overheating hence the change
out of the coil. I had the new one so what the heck, change it
out. I cleaned the coil area to spotless when i put the new
coil in and cleaned off the old coil too. So I re-installed the
old coil (an OEM one) and the spark visibly improved.
Put the whole thing back together and it started an ran like a
champ........So the lesson learned is again knock off parts are
shite and even new stuff can be faulty.
I gave the saw back to my neighbor and said have at her and
report back.
#Post#: 86931--------------------------------------------------
Re: Pulling my hair out - Rebuild of 353
DIR By: Chainsawrepair
Date: July 9, 2020, 3:08 pm
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Was following. [emoji121]
Thanks for posting findings and fix. [emoji41]
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