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Set fuel mixture with high and low

I have a poulan 2550 chainsaw trying to to set high and low fuel settings

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Starting settings are 1 turn on high side and 1 turn on low side.most likly you will be at 1 1/2 on low side and 1 1/4 on high side

Posted on Jan 09, 2009

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1 Answer

My chainsaw is idling high


Several reasons for that,
1. Air is getting into saw through leak in manifold
2. Carb idle/rev screw is set too high
3. Carb idle mixture screw is set too weak (uscrew it a tiny bit and check) See my other answer link below for advice on that:
4. Fuel filter in tank is partly blocked reducing fuel flow. They should be changed once a year on a domestic saw, more often on a professional saw.
5. The springs on the clutch are weak allowing it to engage at too low a speed.
Carburetor adjustment for efco 152 chainsaw

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Why does my poulan 2075 runs with choke on but not when i push the choke in?


Crank seals could be leaking air in,or carb settings incorrect.screw both mixture screws right in,then out 1.5 turns..set low mixture screw for highest idle,you may need to unscrew the idle screw a bit to keep revs down.adjust H mixture screw at full revs,to get max revs,then unscrew 1/4 turn.may need to reset idle

Jul 23, 2014 | Poulan Chainsaws

1 Answer

The small saw serial #1J295L669 starts O.K. and runs for about a minute, but then dies on me. there is a high and low adjustment screws;however the cover over the carb. seems to have an effect before and...


Most of carburetor has three buttons to adjust. L (low), H (high) for fuel injection at low and high speeds. There is also a minimum (the chain must be stationary if it is well tuned). The chainsaw is set at low rpm throttle with screws ( L ), and its vivacity is set at high speeds ( H screw ). In the beginning is good put both to set at 1.5 turns from full closure. And then, if the chainsaw starts, you can adjust a carburetor work. Careful with adjusting with H due to high speed.

Sep 06, 2011 | Poulan Chainsaws

1 Answer

I have a Poulan chainsaw that starts, and runs, but when I squeeze the throttle trigger, it bogs, and stops running. Any suggestions as to the problem?


The possibilites are 1. dirt or water in the fuel; 2. filter in fuel tank clogged; 3. main mixture screw set too lean. I am presuming you have the correct petrol/oil mixture.

Mar 20, 2010 | Poulan Chainsaws

1 Answer

Base adjust. on carb high and low needles on carb polen 42 18" thanks


The standard setting on needles is to screw them in all the way and then back them out 1 and a half turns.

You need to set the mixtures for the carburetor. You will find a Low and High adjustment screw. turn the low adjustment screw out. You will notice that the rpms should start increasing. keep turning it out until the rpms start to drop then turn it back in a quarter of a turn. You may need to readjust the idle speed so the chain doesn't turn during idle. Do the same for the high adjustment screw.

Oct 01, 2009 | Poulan Pro 42CC 2 Cycle Chainsaw, 18"

1 Answer

I have a poulan 2550 40cc that won't run in idle


Possibly the spark plug, idle screw is set too low, air getting into the fuel line. Does it run at higher speeds but kills when trigger is released?

Dec 23, 2008 | Chainsaws

1 Answer

I have a poulan 2550 that won't idle what could be the problem?


try the L mixture screw, turn it in slightly if the engine speeds up it was too rich if it bogs down go out slightly un till it starts 4 stroking.

As a starting point both screws set to 1 turn out from just seated..if the high speeds ok dont touch the H screw.

Dec 23, 2008 | Chainsaws

1 Answer

High geared chainsaw


Hi 1tgriffin,
My name is Dennis and I hope that will serve your needs.
IDLE ADJUSTMENTS:
There are three adjustment screws on the carburetor labeled
H (for High speed MIXTURE)
L (for low speed MIXTURE)
T (for idle SPEED SETTING)
They are located just above the primer bulb. If your saw floods so soon in the starting process the idle mixture setting can be set too rich and the speed may be set too slow. Remember the chain will not move when the idle speed is set correctly with a WARM ENGINE!
Adjust the idle speed to just below chain movement WITH A WARM ENGINE this is just below the activation RPM of the centrifugal clutch. Let the engine run at a higher speed than idle until it is warm -- 3 min -- you may have to keep goosing it until then.
Please don't exceed the limits of the plastic limiters when making adjustments.
If you haven't adjusted the mixture screws you may just have to adjust the idle speed and that can start my turning that screw all the way in to the stop and then back out 4-1/2 turns for a good place to start. FAST IDLE -- Adjust the speed until the engine runs with out the chain moving. Adjust clockwise to increase speed. C clockwise to decrease engine speed.
Accelerate the engine and if it stumbles and makes too much smoke it's too rich turn the
LOW SPEED MIXTURE (in) clockwise in 1/16 a turn increments NO MORE at a time because a two cycle needs to run at a setting for a short time to really prove the setting. don’t run it wide open to warm it up but it should be at a fast idle. Nothing you do will be proven correct until the engine is warm.
Good Luck
Glad to be of assistance - please rate the solution because I will learn from your rating. Thank you

Sep 02, 2008 | Poulan Chainsaws

1 Answer

STIHL CHAINSAW MIXTURE SETTINGS


one turn high and low 66 has compesator carby willrun rich up high but will lean under load

Aug 31, 2008 | Chainsaws

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