345 husqvarna chain saw will not run

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.

In simple terms here we go, turn both L screw and H screw fully in until they stop ( clock wise ) now turn the L scew out one and a half turns out, and the H screw one and a quarter turns out, start the saw ans warm up the engine, allow the saw to idle, if need be turn the idle screw in to gain a slightly fast idle, start to turn the L screw in, the revs will start to increse as the mixture leans off, thet will reach a point where the engine then starts to die because it is too len, at this point unscrew the screw quarter turn, check the machine revs up clean, if there is a hesitation unscrew the jet a smaal bit at a time until it revs clean, now adjust the idle screw so the engine idles without the cutting chain rotating around the bar, the H screw should be about right however if it sounds too rich at full throttle srew the jet in a small amount until it sounds right, the maximum rpm should not exceed 13500, this should realy be check with a rev counter, if the engine revs too high there is a fear that it will over heat and seize.

Sounds like you have had a kick back and the chainbrake has activated, with the engine stopped, grab the front hand guard and pull it fully back to the top handle, until you hear the click of the brake loading.

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.

reportedly you need to open up the low idle jet screw about 1/4 turn, takes an odd shaped tool to get at it, Husky sells this tool, or you can probably makeshift one from hard plastic tube... anyway, this is due to EPA issues, but once you increase the L adjustment 1/4 turn (counter clockwise, I believe), problem is said to go away.

Find the 2 screws. There will be a (h) high and (L) low. These are for hig rpms and low rpms. First tighten the screws. Then unscrew them about 1-1/4 turns. Then start the saw and let it warm up. Start with the high rpms first pull the trigger all the way then adjust the screw in 1/8 turns either way until it is running good at high rpms. Then work on the L rpms. Get the saw to idle then pull the trigger, there should not be any hesitation when going from L to H rpms. Just adjust the low same as the High. They have to work together so if the high is good and the low is not just right turn the h a small amount. If you have any more questions let me know

Turn the Hus 345 chain saw upside down, you may see a little Icon of a oil droplet and a + - arrow by the chain. THe adjustment screw is not pictured in any of the standard user manuals,. but it is a small black slot headed screw over a rectangale metal tab by the chain. I believe if you turn it counter-clockwise, it will give you more oil,, It did for me. If you have the bar off, you can start the saw and see it come out the hole, that would verify your oil pump is working. Make sure the holes on the bar are clean also. running the saw at a fast idle for 1 min should oil the chain well enouth that it starts spraying off the end of the bar when you gun the engine.

It sounds like the centrifical clutch is in need of service or replacement, or the brake is not adjusted properly.

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

adjust the gas by turning the screw on the carburator