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What is the initial setting tor air/ fuel mix.?

Having trouble ideling.

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Check the air cleaner, muffler, and fuel filter for any plugging. Check the fuel lines for condition. Make sure the carburetor fasteners are tight. If all are ok, then set the L needle CW to it's stop (lightly), then back out CCW 1-1/2 turns. Start the engine and allow to warm up, then turn the needle CW until the engine runs fairly well, but allows the engine to 'follow the throttle'. Set idle speed screw so that the chain stops moving, but the engine continues to run. Hope this helps!

Posted on May 14, 2010


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Hi and welcome to FixYa,

Initially, inspect the burn colors of the sparkplugs. If they are very light in color, then it would indicate a lean mix

Offhand, a lean mix and the flat spot would both indicate an air leak; too much air, too little fuel. Either or both could be caused by a torn or out of position air filter or the air box not properly sealed. Aftermarket free air breathers/filters such as those by K & N and/or non-stock exhaust could also cause lean mix/flat spot if the carbs were not re-jetted. In some instances, the needle height might require adjustment.

Good luck and thank you for asking FixYa.

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