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I have a Husqvarna 375k cut off saw. It has spark, rebuilt carb, good compression, I even sprayed a little starter fluid in the cylinder and it won't even try to fire. Definitely has spark

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  • 301 Answers

Try taken the spark plug out , using the starter cord slow pull on the string. Looking inside where the spark plug was, does the cylinder move up and down?
If it does you might have a bad ring around the cylinder.
One last thought, make sure that the spark plug is clean and re-gap correctly.

Posted on Apr 08, 2015

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Posted on Jan 02, 2017

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SOURCE: 46 cc Sears/Poulan chainsaw will not start

Four things I can think of:
1) There is a short in your spark plug wire. When you bend it to connect the plug in the machine it allows the exposed cable to contact the engine block. Examine the wire all the way to the coil.

2) Flywheel key is sheared ( you obviously know how to take off the flywheel since you checked the seals).

3) Flywheel air gap is not set correctly. Loosen the coil. Put the cover of a notebook or the cardboard piece of a cigarette pack between the magnetic portion of the flywheel and the coil. Tighten the coil down. This will get you the proper gap.

4) Your cylinder/piston or rings are scrubbed out. Even though it passed a compression test, on rare occasions it will loose compression only when it fires. So do the following:

Remove your exhaust manifold. Look into the cylinder with a flash light. You are looking for scratches. Anything larger then a light fingernail is definite proof you need a new cylinder/piston assy.

If it passes that test do the following:

Pour mixed fuel straight into your cylinder until 1/4 full. Slowly pull your saw over while looking into the cylinder. If you see bubbles after the ring/rings go by then you need a new cylinder/piston assy. On rare occasions if no scratches are present on the cylinder wall or piston, you may be able to change just the rings.

First if you can get a inline spark tester so you can see if your getting spark with the plug installed.

Posted on Mar 31, 2009

  • 403 Answers

SOURCE: After long storage, cleaned carb,

you say you cleaned the carb, most importantly, did you clean the jet in the carb. if not there your problem. The ethonal in gas will gum it up in a heartbeat if not run.

Posted on Mar 11, 2011

2strokeJim
  • 577 Answers

SOURCE: Stihl MS 290 won't fire even when primed directly into cylinder

crank seals are probably shot :-(

Posted on Nov 29, 2012

  • 1 Answer

SOURCE: saw will not fire. has

no spark at plug

Posted on Feb 01, 2013

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Replace the condenser. You'll still get spark with a week or dead condenser, but no fire under compression.

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sure sounds like you did it all.
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Sounds like you have a compression problem. Starting fluid will fire at a much lower compression than a gas/oil mix so that's why it will start with it. When the motor is running you get a little more compression because the piston is coming up so fast. You should check the condition of your cylinder wall and piston & ring. If they are damaged at all you loose compression which directly affects starting and running power.

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My chainsaw starts and idols ok ,when I try to cut a log it bogs down and stalls off


Sounds like a carb problem. My 310 stihl did the same thing. Rebuilt the carb and now it will cut the gates of the hinges off of H**L

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Husqvarna Model 51 won't start. Was running fine and has never had a problem starting (owned since new, 14+ years). Chain slipped off. Fixed and then saw wouldn't start. Good bright spark &...


If you have a good spark, and there is fuel at the plug, the only things to stop it fireing up are a sheared flywheel key knocking the timeing out, or the engine has low compression due to wear or damaged piston and ring.

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Are you sure you pump in the unit properly? Some carbs have the gasket against the carb body and some have the pump next to the body. Also check the needle valve for proper operation,and dirt.

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Did you spray the starting fluid into the plug hole or the carburetor opening. Check the muffler for plugging as well as the air cleaner. When you have the muffler off of the engine, inspect the piston skirt and cylinder wall for any serious scuffing caused by either dirt in the engine or loss of lubrication. This is usually accompanied by loss of compression in the crankcase and upper cylinder. It's possible that the flywheel key has sheared causing the spark to occur at the wrong time. Hope some of this helps!

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1 Answer

Husqvarna chain saw Model 141 running at high rpm's


You may wnat to inspect the intake manifold/boot that mounts inbetween the cylinder and the carb. Also, the impulse tube that comes from the bottom of the cylinder to the carb manifold or carb itself. Sounds like you are running a lean condition. You need to locate the source very quickly, or continued operation will permantly damage the saw. I have listed a few other things to check.
Please let me know what you find. rwvanlue

Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled (black and carbon deposits)
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check cylinder compression

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

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Runs great for 30 sec. to 1 min. then dies slowly


Is it your chain saw Husqvarna 40?

Try carb adjustments H-3/4 turn ,L-2 turns and T a little higher
I presume that compression and ignition sistem is adequate for the engine to run.Good luck

mihai

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What coul be keeping my 1986 honda civic from starting? The plugs all spark, the fuel pump gives gas to the carb, Ive changed all plugs cap and rotor and have tried spraying starter fluid directly into...


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