Question about Husqvarna Chain Saw 20" Bar

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What is idle adlustment

Hi or low, or do I use the T to adjustit.

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High speed H=3/4 turn
Low speed L=1 1/4 turns
Adjust T accordingly

cheers savumihai71

Posted on Dec 06, 2008

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The T is just the idle adjustment hi & low r mixture settings if your not sure don't play with hi or low settings hope this helps

Posted on Nov 27, 2008

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Hi, I have a Mac-3200 and need to know where to set the 3 carb. screws at. T, low and high I don't have a manual Thank you. Z-man

Most guys adjust them 'by ear'. Warm up the saw (hopefully you can get it to start), and set the high speed by opening the screw until it sounds like it is 'burbling' at wide open throttle. DO NOT adjust until it is screaming at its highes attainable rpm !!!! If you do, the mixture will be so lean it will damage the saw under repeated heavy load. Leaving it 'burble' at WOT (wide open throttle) will ensure that proper lubrication will be available in the cut. Under load, the burble will disappear and the saw should pull strong and not overheat, damage the piston or score the cylinder wall.

Next set the low speed screw until there is no hesitation in rpm increase when the trigger is pulled. Some suggest setting the low speed first then the high speed so you may have to readjust the high speed once the low speed is done.

The idle screw should be adjusted to where the chain is NOT rotating the guide bar at idle. If it continues to move, the idle is too high.

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1 Answer

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1 Answer

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Most poulan chain saw have three screws idle, high, and low.. if you look air filter cover you will usually see three holes and the high and low will usually have plastic covers on it.. adjust the low 1/4 of a turn and the idle screw in about 1/4 or until the idle picks up... On the plastic cover where the three holes are you will see H which is High L which is Low and I which is Idle... Let me know if you have any problems.. thanks

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1 Answer

XL 2 auto carb adjustment, idles far too fast


On the left side of the saw, opposite bar and chain, are 3 adjustment screws. The top two are the H, high, and L, low mixture screws. Under those is a screw marked T. This is the idle speed adjuster. Turn counterclockwise to bring down the idle speed. Adjust only when saw is warm and just until the chain stops turning.

Hope this helps. If it does, I'd appreciate your vote. Thanks,

Handie Andie

Apr 14, 2011 | Homelite Garden

1 Answer

Cant find the idle screw

Hi allenplum,
There are 2 mixture screws, 1) the idle speed screw, 2) is the idle speed mixture screw. The idle speed screw is located on the carburetor, nar the throttle arm where your throttle cable is connected. There is a screw that you will find there that you screw in or out to speed up, or slow down the engine idle. The idle speed mixture screw is located lower down on carb and has a spring on it. There should be 2 screws side by side, one is the idle speed and the other is the high speed mixture screw. They are marked on the carb body, with the letter H or L . To adjust, remember the screw position before you do any adjustments. Start by turning the screw in (clockwise) all the way in until lightly seated, so no damage is done to the seat or needle. Turn out (counterclockwise) 11/4 inch, this should be OK to start the engine. Along with the idle speed screw, you should be able to get the correct idle required. With all the modernization happening, there might not be a high or low adjust as they are ported inside the carb. You might get just the high or just the low adjust needles. I hope this is helpful to you. All the best and good luck. Denis.

Mar 19, 2011 | Husqvarna "Chain Saw - 16" Bar, 3 Hp

1 Answer

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1 Answer

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the setting is aprox 1 1/2 turns on low idle and aprox 1 1/2 to 2 turns on high

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1 Answer

How to adjust oiler on husqvarna 266

Your saw didn't get a hit, she long of tooth?
Husky 262 manual
The adlustment is on page 31. It is probably similar. HTH

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1 Answer

How to adjust carbs i screwed the throttle screw in all the way and lost track how many turns it was now it will not start

you should have 3 adjustment screws. the one marked T is throttle idle position,adjusts idle speed.Lo adjusts air-fuel mixture at low rpm,HI at high rpm.H & L should be 3/4 to 1 1/2 turns out from a lightly seated position.adjust for best rpm's at Lo,then Hi.turning idle screw in too far would not affect starting,only idle speed.

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2 Answers

Carburetor adjustment on McCulloch Mini-Mac 30

turning Hi & Lo mixture screws in leans the mixture,out rich-ens it.turn the T screw in to increase idle speed the chain should slowly come to a stop at idle [chain brake off] adjust Low needle first until it accelerates smoothly then Hi needle for best 'revs'.then Lo again if necessary if you don't know where they were set before,start w/ screws 3/4 to 1 turn out from a lightly seated position

Sep 23, 2009 | Garden

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