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Husqvarna 345 chainsaw cuts off when hot

I have a Husqvarna 345 chainsaw. Runs excellent, has just had a tune-up (spark plug, fresh mixed gas, air filter, etc). Runs excellent until it has ran for 17-20 minutes (yes, I've timed it carefully), then it dies. Of course, at this point, the chainsaw (engine) is very hot, no doubt. So right away, I changed the gas in the tank, thinking it might be old/stale a bit? Anyways, within moments, I started it again, runs great, cuts great and all.... 20 minutes later, dies. What do you think may be causing this problem?

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  • 17 Answers

It sounds like it may be getting lean at that point, and it could be something like a tank vent. When this happens, open the filler cap, close it, and see if the saw will start.

Another easy test is to fill the tank completely in the event that a small hole has formed in the fuel line inside the tank. I doubt that is the problem, but worth the time to check before moving on to other tests.

If that doesn't work, disassemble the carburetor and clean all passages with non flammable brake cleaner (carburetor cleaner can damage check valves and soft small engine components). Sometimes dirt can accumulate in places that affect how the diaphragm moves.

If none of this works, have a service shop evaluate the unit. Pressure and vacuum tests will reveal the culprit(s) and determine if the saw qualifies for service.

Posted on Apr 23, 2014

6 Suggested Answers

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Posted on Jan 02, 2017

  • 16 Answers

SOURCE: my 345 chainsaw bogs down when it hits wood

There are two idle screws one high, and one low. Your high adjustment idle screw needs to be adjusted.

Posted on Jan 19, 2009

  • 7 Answers

SOURCE: Husqvarna ranger 55 chainsaw starts but quits

Sounds like it could be fuel starvation. I just had a case of exact same except mine finally worsened. Most likely and what I just encountered, its your fuel line. It's a quick and simple fix and you can do it yourself. Youtube has several videos showing you how to do it. Feel your tube, if it feels soft or spongy, it's probably got cracks or even a pin hole somewhere. It's $10 and as I've learned, one of the most common fixes when saws start cutting out at full throttle or under load. My dealer said he's been through 15 of them in the past 3 months.

Posted on May 07, 2009

#1 Taper
  • 1040 Answers

SOURCE: husqvarna 51 chainsaw wil start up and run as long

First, check the fuel lines for cracks/breaks.

If they are o.k.,then you will need to disassemble the carburetor again and spray with carb.cleaner. Make sure the small screen in the carb. is free of debris. Usea Den Tek Brush, (http://www.drugstore.com/products/prod.asp?pid=165357&catid=1152), to clean the small portals in carb. These portals can become blocked. Reassemble and start.


If you need further assistance, just let me know.

Jim

Posted on Jun 14, 2009

dontbother10
  • 2220 Answers

SOURCE: Husqvarna 345 chainsaw will not start. It is 3

I suspect she is flooded. Flooding is the most common cause of fails to start on a chainsaw. Remove the plug I bet it's wet.
Start Procedure
Cold:

  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close) choke, set fast idle (done when choke closed on some saws); pull starter and listen for an attempt to start. once heard (usually two pulls; no more than 4)
  4. Set compression release – optional step even if saw is equipped with a compression release
  5. Push (open) choke pull starter until it starts. (usually first pull)
Warm:
  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close) choke, set fast idle (done when choke closed on some saws) - Don’t pull with choke closed.
  4. Push (open) choke, pull starter until it starts. (usually first pull)
Hope this helps
Lou
I've a 359 one time I forgot to pull then push the choke (sets fast idle). My shoulder gets sore just thinking about it.

Posted on Nov 10, 2009

rwvanlue
  • 486 Answers

SOURCE: My Husqvarna 350 chainsaw won't stay running.

Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
Chain Saws:
5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then:
Remove Carburetor
6) replace gaskets/diaphragms
a) use a spray carb cleaner to clean jets, holes, and body of carb
b) fuel pump diaphragm goes against the carb body,
then the gasket towards the outside
c) metering gasket goes against the carb body,
and the diaphragm goes towards the outside

Posted on Nov 25, 2009

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either blocked fuel filter in the fuel tank ( hook out and replace ) or the fuel tank breather is blocked thus causing a vacume in the tank, to prove this, when the saw starts to die slacken off the filler cap, this will allow air into the tank and it should pick up again, the breather is pressed into the tank on the r/h side rear.

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Sounds like the ignition module or spark plug. The ignition module is what controls the spark plug that gives your saw the firing capabilities. Before you purchase one of those, replace the spark plug and see if that works. The 240 is a newer husqvarna; so I am skeptical to say it is the ignition module. However, any new product can have a bad part on it.

Your saw may have gotten flooded and won't start. Make sure your gas mixture is 50/50 gas to mixing oil. Always use fresh gas. If you make up gas and don't use a whole gallon at a time, put some fuel stabilizer in the mixture; so it will still be fresh the next time you use it.

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1 Answer

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hi
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Drain the fuel tank, look inside the tank to ensure that the fuel line inside still has a fuel filter attached to it.
Look at the on/off switch ensure that both the wires are still attached to the switch securely.
Check that the plug still has spark, if unsure replace the plug.
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Remove the spark plug and test for spark. If ok, try some starting fluid in the plug hole, install the plug, and try to start. If it runs a short time, it is not getting fuel. Check fuel lines including inside the tank. Clean or replace the air filter. If this saw is fairly old, the carburetor probably needs a re-kit and cleaning. Does it have good compression? Check the muffler for plugging. Make sure the fuel/oil mix is fresh. Good luck!

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1 Answer

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2 Answers

My 345 chainsaw bogs down when it hits wood


There are two idle screws one high, and one low. Your high adjustment idle screw needs to be adjusted.

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