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Poulan 2450 wont start

How do you set the high and low settings

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After warming up the engine at part throttle for a couple of minutes, clear it out with a 3 second burst. Then idle the engine.. If the chain rotates, turn the idle speed screw to the left (CCW) until the chain stops.
Turn the LO NEEDLE slowly to the right (CW) to find the fastest engine speed. If this causes the chain to rotate, repeat idle screw adjustment to stop the chain from rotating.
High speed (with throttle wide open). Set needle 1-1/4 turns open, checking for smooth acceleration by opening the throttle wide for 3 seconds. If the saw stumbles, turn needle to the right (CW) 1/8 turn @ a time until smooth acceleration is obtained. Try a saw cut to see if adequate power is available. Continue making 1/8 turn adjustments (CW) until saw shows a power drop when asked to cut. (This indicates too lean a mixture setting.) Then, from the setting in step 3, turn the HIGH NEEDLE 1/4 turn to the left (CCW). Check the cutting ability of the saw again. This should be the best setting for your particular altitude, temp. and humidity conditions.
To pre-set before initally starting the saw, turn LOW and HIGH and IDLE screws in gently till each one just stops. Then turn each out (CCW) 1 - 1 - 1 1/4 turn.
Hope this is helpful. Try www.zamacarb.com/tips.html Select the "Tech. Guide"
Good luck and God Bless.
oft

Posted on Jan 22, 2009

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Hi Guest,
My name is Dennis and I also have the model you are having difficulty with and I can only repeat the instructions from the owners manual (with personal comments) because they have always served me adequately 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!
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Please don't exceed the limits of the plastic limiters when making adjustments.
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Accelerate the engine and if it stumbles and makes too much smoke it's too rich turn the LOW SPEED MIXTURE (in) clockwist in 1/16 a turn incriments NO MORE at a time because a twocycle needs to run at a setting foe a short time to realy prove the setting. dont run it wide open to warm it up but it should be at a fast idle. Nothing you do will be proven correct untill the engine is warm.
Good Luck
Glad to be of assistance - please rate the solution because I will learn from your rating. Thank you
Your IDLE MIXTURE may be too rich causing the engine to flood.


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