Husky 345 chainsaw will only run with choke almost completely out. New air filter, spark plug, and fuel filter. Also replaced gas.

If it is a saw that has electronic ignition like some of the newer Husky or Stihl models then take it back to the dealer - they have had loads of problems with the electronic control modules. If not then it sounds like either the fuel filter and / or air filter needs changing or there is muck in the carb that needs cleaning out. It is best to blow the jets in the carb through using compressed air if you can.

The plug should gap at 0.5 mm or .020" and be sure to use the proper resister plug. Do not cross reference a plug.

test the steps and fix it. God bless you

Spark Arrester

Inside the muffler of most chainsaws is a screen-like device called a spark arrestor. If the chainsaw stops after a few seconds or won't start at all, the spark arrestor might be clogged. The spark arrestor prevents small embers from being emitted by the engine to prevent fires. Over time the spark arrestor will become clogged with soot. Remove the spark arrestor and clean with a wire brush or replace.
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Carburetor

If the chainsaw engine stops after a few seconds, the carburetor might be clogged or have bad fuel in the float bowl. If old fuel was left in the chainsaw for a long time some of the volatile ingredients may have evaporated, leaving a thicker, stickier product that is more like varnish or shellac. This sticky fuel can clog up the small jets and ports in the carburetor and it can be difficult to burn allowing the engine to only run for a few seconds. The only solution is to drain the old fuel from the float bowl and thoroughly clean the carburetor with carburetor cleaner. If that isn't effective, replace the entire carburetor.
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Gas Cap

The gas cap on YOUR chainsaw is designed to let a very small amount of air into the tank. This is necessary because as fuel is consumed a vacuum is created in the fuel tank. The gas cap has a tiny vent to let air into the tank and equalize the pressure. If the gas cap vent gets clogged air can't enter the tank and eventually the vacuum pressure in the tank exceeds the vacuum pressure of the engine, and the engine stalls. The vent often cannot be cleaned because it is made of a semi porous ceramic material. If the gas cap vent is clogged, replace the cap.
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Spark Plug

If the chainsaw starts and stops after a few seconds The spark plug may be defective. Although this is not very common it is easy to test. Try removing the spark plug and installing a new one.
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Fuel Filter

If the chainsaw stops after a few seconds, the fuel filter might be clogged. If old fuel was left in the chainsaw for a long time some of the volatile ingredients may have evaporated, leaving a thicker, stickier product that is more like varnish or shellac. This sticky fuel can clog up the fuel filter and it can be difficult to burn allowing the engine to only run for a few seconds. The only solution is to drain the old fuel from the fuel tank and replace the fuel filter.

turn on button & choke pull till fires ounce then takeoff choke hold gas & pull start

The symptoms indicate lean running, so check the fuel filter for plugging and the fuel lines for decay or other damage. Husky seems be having troubles with our ethanol treated fuel and may require some warranty attention. We have a year old 435 Husky that would not start after about 3 days of excellent running--warranty replaced the carburetor which seems to have us working well now. Good luck!

INFO:
-Remove Carb and clean, you have a high speed fuel port clogged.

NOTE:
This would also be a good time to replace your fuel lines, Take photos before you start.

RECOMENDATIONS:
-Drain all fuel from the Saws fuel tank.
-Remove and REPLACE with a NEW spark plug.
-Remove and RELPACE with a NEW Air filter.
-With spark plug and air filter removed and fuel drained pull the starting cord many times 12 or so to ensure there is no fuel in the chamber and also check for a spark at the plug.
-RE-MIX WITH NEW FUEL your 2 cycle oil to the correct ratio in a clean fuel can. it is OK to dump some in the Saws fuel tank slosh around and dump out in an approved container for disposal.
-Hold off on putting back on the air filter until you have had it running.

Hope this Tip Helps.

R/
David

It needs spark, fuel and compression to run, which is missing?
Lets start with spark. Replace the plug (very inexpensive and great insurance), then do this:
Ignition Coil Test by SmallEng.com
http://www.youtube.com/watch?v=L7WNBDRG4C4
You may need to use a jumper wire between the threaded part of the plug and the cooling fins. You do not have to bend up the electrode.

Before we get to fuel please download and follow the start procedure in your Operator's Manual here:
HusqvarnaUSA.com
http://www.husqvarna.com/us/homeowner/support/download-manuals/
Enter the 3 digit model number (no XPs, Es, just the numbers)
Serial number decode – useful when downloading IPLs and Manuals
06 1500198
06 = year produced – 2006 (single digit before 2000)
15 = week produced - March
00198 = 198th unit Husky produced that week
I own a Husky 359 that 1 time I forgot to set the fast idle (close then open choke). It was near impossible to start. I have missed the initial attempt to fire and flooded it too, again almost impossible to start.

If it has spark and the start procedure fails, put a teaspoon of fuel mix in the carburetor throat, open the choke, and pull. Does it fire and attempt to start? Yes it probably has a fuel delivery problem. Please repost with what you did and we will continue. HTH
Lou
IMO regardless of what your manual says ( yours probably 50:1) all 2-cycle engines should be operated on 50:1 (1 gallon of premium fuel to 2.6 ounces of quality 2-cycle engine oil). Once adjusted for this mix they start easier, pollute a bunch less, and do not foul out plugs, cylinders, or mufflers. Run lean conditions are most often caused by dirty air filters, air leaks not detected by the operator, or failing to add any oil to the fuel in the tank. Using a 32:1 mix prevents none of these occurring! I use a Pioneer chainsaw I purchased new early 1980 with a 50:1 mix.

is the stop switch at run?check filter is seated properly,
;switch wires were not compromised removing or replacing cover.

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.
Check the air filter to ensure that it is clean.
Mix the gas 50:1.

It has a crack in the fuel line between the body and the tank. The crack lets air in the line. Replace the line.