Tuning help

[Welderman85]

Hello all i have been watching and reading alot about tuning saws. Im confused on how to set the low needle vs the idle screw. In some video they adjust the both in some they only do one?

 

[Lee192233]

Here you go. Great info from Madsen's.
"Saw Carb Tuning" http://www.madsens1.com/saw_carb_tune.htm

 

[Huskybill]

My dealer taught me what works on the pre xt/at saws. You let it idle and turn the low speed jet in slowly till it gets blubbery and almost stalls. Then back it out one half turn. Adjust your idle speed(rpm). Repeat a second time to be sure it’s correct. ( fine tuned).
I never fouled a sparkplug or clogged the spark arrestor after that.
It works on every saw.

 

[Vintage Engine Repairs]

They work together.

Adjustment of the L will affect the idle speed and thus it’s used to offset the adjustment.

 

[lone wolf]

Hello all i have been watching and reading alot about tuning saws. Im confused on how to set the low needle vs the idle screw. In some video they adjust the both in some they only do one?

Set the H and L needles to the stock amount of turns out.
Then adjust the L needle if the saw wont idle right, notice if it is lean or rich and turn accordingly.
Then adjust the H needle by using a tach to set the recommended RPM.
The idle screw is to fine tune the RPMS lke if it stalls or runs too fast and the chain is moving.

 

[davidwyby]

Idle mix screw also affects throttle response.

Once you have it tuned, let it idle a bit and tilt the saw nose down…if it blubbers or stalls, it’s too rich.

 

[huskihl]

Use the L needle to set the mixture as lean as possible and still idle smoothly (usually in until it lopes and then back out 1/8 - 1-2 turn, they’re all different), and adjust idle speed with the idle screw. It prevents you from being 4 turns out on the L and forcing it to still idle with the idle screw