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I have a McCulloch Trim Mac SL+ which will not idle. No matter how I try and adjust the idle screw it cuts out.

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Which idle screw are you adjusting, the idle jet (L) or the idle speed screw which sets the throttle stop position. Adjust the idle speed screw while watching the throttle stop position so that it is pushed away somewhat. Adjust the L jet needle CW to stop (lightly), then back out 1-1/2 turns CCW. This should allow the engine to idle after warm up. Turn the needle CW while running for better idle, yet it should allow the engine to 'follow the throttle'. If this doesn't work as described, then check the fuel filter, air filter, and muffler for plugging. Check the fuel lines for decay or other damage. You may need to remove the carburetor and clean it inside and out with spray carburetor cleaner. For further insight, go to: http://www.drystacked.com for a 12 page article on Walbro brand carburetor theory and troubleshooting. This material applies in general to other brands of carburetor as well. Hope this helps!

Posted on Sep 13, 2010

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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.
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