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Gas cut off saw wont rev up and it wont idle - Saws

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Get a mechanic to retune your carb...i would not recommend you DIY..
worst case,you need to replace the diaphragm around 10 bucks

Posted on Aug 05, 2009


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Posted on Jan 02, 2017


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Hard starting

Good morning Marty.

I don't know your specific model, but have rarely seen a chainsaw that doesn't get persnickety at times.
You've been able to get it running, which means you have gas, a spark, and air. The next questions would then be:
  1. Are you running on gas that's been sitting for a long time? If so, get some new gas and mix the right amount of 2-stroke oil in, as recommended by your manual.
  2. Have you checked that you have bar oil? There's a second reservoir for the chain/bar lube oil. Make sure you're not dry there. If you are, you'll generate a lot of friction and heat between chain and bar, can gum up the chain with wood debris, and will start damaging your saw quickly.
  3. Can you rev the saw once started? If you can rev it to higher RPMs and get the chain to engage, (and hopefully be able to see a fine spray of oil coming off the far end of the blade), then the saw can run and cut. If you let off on the gas and it slows down and then dies, you likely need to adjust the idle. There will probably be an indent on the side of the saw with labels like 'Lo' and 'Hi' or 'Idle' 'Cut' or some such. Try turning the 'lo' screw a quarter turn, probably clockwise. Try starting / idling the saw and see if it sounds better or worse. If worse, undo the quarter turn and go a quarter turn the other way. Keep track of how many turns you do. If there's really no change, return the screw to the original position. if it improves, still keep track and then leave at a position where the idle runs acceptably.
  4. You could have a clogged fuel or air filter. Restricted fuel or air flow could make the ignition dodgy, and not enough to maintain idle at low RPMs. Cleaning or replacing the filter(s) may help. Chainsaws generate prodigious clouds of wood dust, and that can foul a filter, especially an air filter, really quickly.
  5. Fouled spark plug. likewise, lame spark can also make for lackluster ignition and inability to idle well. Pull the plug, examine it for fouling, and check that it's properly gapped. Clean, gap, and/or replace as seems prudent. See if that makes a difference.
Hoping this may help!

Nov 23, 2015 | Garden

1 Answer

What are the air and gas settings for a poulan micro XXV chain saw

adjust the L screw in fully till right in,then out 1.5 turns,same with H screw.Then start saw,adjust L screw in or out slowly till you get max revs.You may need to lower idle via idle screw if revs too high.When screw cant acheive better revs,reset idle.Then,rev saw to max revs,adjusting H screw to get max revs,then when max revs acheived,turn screw anti clockwise 1/4 turn out.That gives it enough petrol to cool the tip of the plug

Aug 12, 2014 | Garden

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Have a homelite gas chainsaw it will start and idle but can' t seem to figure out why the chain won't turn. is there a button of lever to hold to turn the chain to cut?

The saw has a centrifical clutch that engages as rpm's rise. Some saws have a safety brake. It could be stuck. With the saw off can you move the chain by hand? When you rev the saw does it sound labored? The groove in the bar might be obstructed making the chain hang up. If it revs freely but the chain doesn't move, your clutch could be worn. .

May 28, 2014 | Air Tools & Compressors

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Saw wont rev up or idle

First thing, try new gas.
If that doesn't do it, you need to adjust the low and high speed circuits on the carb. A good starting point is 1.5 turns out from fully seated. On that saw I'm not positive if you will have access to the adjustment screws unless you pull off the plastic caps that may be covering them.

Feb 01, 2014 | Stihl Garden

1 Answer

Saw runs for 5 minutes and bogs out

This is sometimes caused by dirt in the gas tank. When the saw is off and being moved around the dirt settles to the bottom. The saw will start OK and rev up but after a while the dirt gets shaken up and sticks to the fuel filter in the tank. When enough dirt covers the filter the saw looses power or dies all together. Sometimes it will get enough gas to idle but not enough to run at high speed. With the tank half full, shake the saw to get all the dirt stired up and dump it out. Put a little gas in it and shake & dump it again. If you can fish the fuel line with the filter on it out, remove the filter and either replace it or blow it out. If this doesn't cure all your problems you may have leaks in the fuel line to the carb that are letting in more air than gas causing your power problems.

Jul 14, 2012 | Makita DPC7311 73cc 14Inch Gas Powered...

1 Answer

First my Stihl Quikcut was getting too much gas now after rebuilding the carb it's not getting enough

Not sure who told you about the compression but that is not true, are you sure the throttle rod is actually pushing the throttle shaft open?

Mar 17, 2012 | Stihl Concrete Cutoff Chop Saw Clutch...

1 Answer

Echo CS-440 Chainsaw. Was cutting firewood, saw running fine until I refilled the gas tank. The gas was a few months old but looked clean and smelled OK. But after I filled the tank could not get the...

unleaded fuel is notorious for going stale,and it can leave a resinous coating in the carb-try running the saw on half choke with new gas and less oil eg 50 to 1 for say ten minutes,this should clear the gunk out-if this does not work,you have two choices-strip and clean the carb,or adjust the H (high) scew on the carb anti-clockwise by a quarter turn a time till it revs out full bore-good idea to remove the chain and wear ear defenders when adjusting-and always use a chainsaw at its max rpm,or you run the risk of "kickback"

Feb 25, 2010 | Echo 30.1CC Chainsaw With a 14 and...

2 Answers

My 345 chainsaw bogs down when it hits wood

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

Jan 18, 2009 | Husqvarna Forest & Garden No.967012396 345...

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