Last summer I got a carb overhaul kit for a Stihl string trimmer that I could not get to run right. The owner of the Stihl dealer/small engine repair shop commented that the newer 2 cycle engines have to be set to run on the extremely lean edge right from the factory to meet tight emissions standards. Restrictor caps on carburator needles are fine when the engines are new, but since they only allow 1/4 turn of adjustment they leave no room for error as engines get older. In time the engines run way too lean and fail prematurely.
As machines get older, many owners are reluctant or don't know to pull off the restrictor caps and adjust the carbs properly, so their engines are ruined way too early from running too lean. He said he sells more repair work and replacement machines because of this, but it makes his products look bad. Eventually most small engines will go to 4 cycle and the problems will be reduced.
Before I tore down the carburator I pulled off the adjustment restictors, opened the needles all the way, turned them back to their original setting and tuned the carb again. It runs like a top now, and it doesen't smoke much. The needles are less than a quarter turn past what the restrictors would allow.
I haven't used the $16 carb kit yet, but I feel the advice alone was worth that much.
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