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Re: Fairly new Husqvarna 142 only runs at high throttle....
What type of fuel are you using.never put premiun it a saw.make sure that there is no alchohalin the fuel ........it make the fuel burn too hot so it looks like a lack of oil in the fuel mixture.......also make sure that the spark plug is correct.......wrong plug will fire too early and either burn a hole in top of piston or show up as a lack of oil........
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First have the saw checked for compression. It should be between 115 lbs and 150 lbs. If the compression is good, check sparkplug, air filter and fuel settings
If this fails, have your dealer do a pressure / vacuum test.
Check air filter- clean or replace,
Make sure you have fresh fuel,
A new spark while you are giving it a service,
Do you know how to tune the saw?
Start with basic settings 1 turn on the low and 1 turn on the high
And adjust from there,
You might have turned the idle up too high.
The choke should always be fully in when saw is running.
Hope this is a good start
Turn both screws CW to stops (lightly), then back out CCW 1-1/2 turns each. This is a basic setting and the engine should start and run. Allow the engine to warm up, then pull the throttle full on. Turn the H jet screw CW until the engine starts to speed up, but still 4-strokes. Proper adjustment occurs when the engine is 4-stroking, but immediately 2-strokes when cutting. This gives best power and lowest heat. Release the throttle and adjust L jet CW until the engine idles fairly well, but will allow the engine to 'follow the throttle'. Adjust idle speed screw so that the chain stops turning, but the engine continues to run. Hope this helps!
Check the fuel lines for hardness, cracking, splitting, or end rot. Check the muffler for plugging. Check the carburetor fasteners for tightness. Are you using fresh fuel mix? If the carburetor jets have been adjusted, try turning both CW to stops (lightly) then back out each CCW 1-1/2 turns. Engine should start and run--allow to warm up. Pull the throttle full on, and adjust H needle CW until the engine starts to speed up, but still 4-strokes. Proper adjustment is when the engine 4-strokes, but immediately 2-strokes when cutting. Let idle and adjust L CW for fairly smooth running, but still allows the engine to 'follow the throttle'. Hope this helps!
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.
Clean the spark arrestor and muffler; if the saw cannot exhale it cannot inhale.
There are 2 wav (sound - idle & full - may not be highlighted) files that I find most helpful, I think you will too.
Most chainsaws die because they are are run lean. I am going to inject a little Lou theory here. Air leaks and defective fuel delivery systems account for most chainsaw failures. Constant adjustment of needle valves can easily camouflage more serious problems that result in burning up your saw.
If you have more questions or need additional help please reply below and I will get back to you. Thank you for using FixYa and Good Luck. HTH Lou
It has an air leak somewhere.
It is running lean; to lean causes failure. Is the muffler loose (fairly common on this saw)? A good saw shop can do a diagnostic pressure test that saves a great deal of time. Usually reasonably priced, try a local Stihl shop by phone.
You can try a little WD-40 at intake connections and crank seals. There are other sources of leaks.
Is the chain being properly oiled? You should get a thin line of oil after running the tip of the saw near to a piece of paper or cardboard for moment or two. Is the saw getting overly hot after running? Clean the cylinder and air passages with compressed air if it is. Check the muffler for any plugging of spark arrestor screen. Turn both jet screws CW to stops (lightly) then turn both out 1-1/2 turns CCW for a basic setting. Pull throttle full on (after warm up) and adjust H for high engine speed, but 4-stroking that smooths out immediately when cutting. Release throttle and adjust L for fairly smooth idle, but rich enough to allow the engine to 'follow-the-throttle'. Adjust idle speed so that the chain stops moving. Hope this helps.
That should be a 50:1 gas to oil ratio. Just make should the measurements are concise, and that your fuel mixture is well mixed. If anything you,d prefer to err on the side of a little tto much oil rather than not enough.
If it is brand new, I'd suggest runninit at about half speed for a minute or three, then moving on up to about 3/4 for another minute.
When you go to cut, rev the engine up to a fairly high speed before putting the saw to the wood. In most cases, you want to let the weight of the saw do most of the cutting, versus bearing down on the sae. Yhat puts undue strain on it, sepecially for a used saw. Try not to allow the saw to "bog" down, so the engine speed drops considerably while cutting.