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The Hi screw is for High speed adjustment and Lo screw is for low speed or idle adjustment.

Posted on Sep 13, 2010


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How to adjust a carburetor on a chainsaw

Depressing the throttle slightly we listen to the engine. If the engine hesitates to accelerate, the LO screw should be opened 1/8 of a turn. If we open the screw too much, the engine will not accelerate smoothly and start shaking (too rich of a mixture). In this case we should close the LO screw slightly. We repeat this procedure until the engine reacts smoothly when adding power. Meanwhile, a readjustment of the idle speed may be needed.

After the LO mixture has been adjusted, we proceed with the HI screw adjustment. After securing the paramotor, we open the throttle to full power. We turn the HI screw to the left or right until the maximum RPM is reached. From this position just a slight turn to the right should cause a significant RPM drop. This means the lean side of the mixture has been achieved. Immediately we OPEN the screw to the left to prevent the engine from overheating!

Let us repeat once again this critical step:

At full power we tune for maximum RPM, then we close the HI screw more, until a drop in RPMs is noticed. When the drop in RPMs occurs we open the HI screw again until we reach maximum RPMs once again, and then we open the screw more until we have a drop of 20 to 60 RPMs. In this position the carburetor will be perfectly tuned slightly on the rich (safe) side.

Next, we should close the throttle and recheck the idle and the LO screw adjustment. If the carburetor was tuned properly, the idle will return to the normal setting described above.

To put it in a nutshell, if the engine idles and accelerates smoothly, does not smoke heavily and achieves 20- 60 RPM below maximum RPM, the carburetor is tuned correctly.

Dec 07, 2015 | Garden

1 Answer

Setting hi lo on 235 husqvarna

You need a special tool to adjust the mixture screws, i have to say they are not easy to tune, you will also need a rev counter to set the high revs, it is very difficult to give basic settings for the carb as they vary greatly

Sep 30, 2013 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

Homelike chainsaw carb settings high/low

Hi, most chainsaws start with carb settings at 1&1/4 turns out( hi+lo) usually once the chainsaw has been run in, the 'hi' screw can be turned in an eighth, tickover set low enough not to cut out but high enough not to engage the clutch, cheers Billy

Feb 15, 2013 | Homelite Garden

1 Answer

What is correct mixture or ratio for fuel for a 1976 lombard chainsaw?

I dont know if it's correct for a 76 lombard, but I always mix 50 to 1 for all my two cycle engines. An engine is an engine.

Dec 30, 2012 | Garden

1 Answer

What is the initial carburettor adjustment for a mac 120 MCCulloch chainsaw?

Hi williamsc32...
Before you remove or try to adjust your low and high speed jets you should always count the number of turns it takes to lightly seat the idle mixture screw and high speed needle adjusting screws.
Be sure to write the number of turns down on a piece of paper so you will know how many turns from the seated position to open the jets when you go to reinstall them, or if you remove them for cleaning or replacement.
If you have aready tried to adjust them then the adjustments below should get it running for you for final adjustment when warm.
Normally you will adjust your idle jet to 1/2-3/4 turn open from the bottom seated position.
Then you will re-adjust the low speed of the engine when the engine is warm by turning the idle screw in or out till the engine runs smoothly at idle speed, around 1200 RPM.
The high speed jet is adjusted to 1 1/2- 1 3/4 open from the bottom seated position, after the engine is warm.
Then re-adjusted by turning the High Speed jet adjustment screw in or out till the motor runs smoothly at high speed.
Alway use the "lightly seated" method if you have not changed the screw settings.
Please take time to rate me

Sep 28, 2012 | McCulloch Mac 110, 120, 130, 140, 160, Eb...

1 Answer

Husqvarna 55 rancher-just put new piston ring and cylinder.saw start right up and idles.when i try to acellerate it bogs and try to stall.when I let off gas it idles fine again.I tried turning mixture...

The plastic carb mount has a hole and a slot, this is the pulse channel from the cylinder to work the pump diaphram in the carb, if you look behind the plastic plate there is a tube that fits into the cylinder under the black induction rubber, this feeds a positive and negative pressure to the carb as the piston rises and falls, make sure you have re fitted the small seal in the cylinder that seals this tube or you will have big running problems.
Let me know if you need more help.

Mar 02, 2011 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

Starts runs but high speed or on tree runs rough like gas problem

there are two adjustment screws on the carb that you can mess with it sounds like it is out of adjustment a little bit one should say hi the other lo try the high adjustment count the number of turns so it can go back where it was

Jan 07, 2011 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

I have a 450, and I would like to increase my bar oil output. Where is the adjustment screw? Please!

There is no adjuster for the Husqvarna 450. Husqvarna recommend that if there's not enough oil reaching the bar that you slow down the engine by adjusting the carburettor screw. I have the same saw and also wanted to adjust the oil flow. I didn't change the carburettor and it's still cutting away without doing any damage. It's meant to use less than a tank full of oil to the tank full of fuel when you're cutting near constantly. With stops in between it will use more fuel and less oil.

Nov 08, 2010 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

What is my lo hi carb adjustment for a Homelite Super XL ? with Homelite/Textron Div. Carb.

Start with 1 turn out from bottom on both and adjust from there as needed. The screw closest the engine is low speed mixture adjustment and the outer is high speed mix. adj. Hope that helps. Dwain

Jul 01, 2009 | Homelite Garden

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