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There will be three screws on the side of the carb, a L screw, this will adjust the fuel mixture from idle to half throttle, a H screw, this will adjust the mixture from half throttle to maximum throttle, and a I or T screw, this works on the throttle spindle and will increse the idle, not the mixture.
If running and you just wish to tweak it a little just follow this. If you need a starting point start at 1 turn CCW from lightly closed then follow this. Carburetor Adjustment by Madsens.com http://www.madsens1.com/saw%20carb%20tune.htm CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly. Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run. There are 2 wav (sound - idle & full – may not be highlighted) files that I find most helpful, I think you will too. HTH Lou If your description was a little brief and I missed your question reply below and I will get back to you.
Hi there. On the outer bar cover near the motor you will find 2 nuts. Slightly loosen those two nuts. Then check around the these nuts or near where the bar attaches to the powerrhead at the front of the saw. You should find an adjustment screw of some sort, which will be the chain tensioning screw (which moves the bar forward/back depending on which way it is turned). This has the effect of either tightening or loosening the chain, so turn this screw noting whether the chain is tightening or becoming loose.
You must slightly undo those 2 main nuts on the side of the chain/bar cover first or the bar will not move and the chain cannot be loosened.
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.
If it idles it is not flooding out as it it most vulnerable to flooding at idle if the stalling is happening as you try to throttle it up it is likely starved for fuel. Start by changing the in tank fuel filter, and the spark plug. good chance that will solve your problem. If it does not Turn the high idle screw out in 1/8 turn increments try running the saw after each adjustment. Keep track of the amount that you turn the screw. you might have to put it back to its original position. Some times adjustment screws will vi berate out of adjustment and other times crud will cause fuel restriction opening the screw allows for a larger port for any restrictions to pass through. After you use the saw for a short time turn screw back in if it starts to stall at idle or you notice increased smoke.