Question about Craftsman 25cc Gas Line Trimmer

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Weed wacker starts and runs but only on idle or part throttle. Full throttle stalls. New gas and plug does not help at all. when tank gets empty it runs like a raped ape for about 20 seconds before the fuel runs out.

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My guess is you are getting way too much fuel. (Runs with choke "on" too? Maybe a little smoke with the correct oil ratio?) If that is true then there are 2 possible solutions. First has anyone tampered with any of the set screws on the carb? If no DON'T touch em. It runs good at the end (20 seconds of raped ape) because at that point the fuel air mix balances out for a short period. But its in a aberrant mode, normally it would putter down and out. Flooding or "too much fuel" happens from 2 causes usually. one is you got a tiny spec of dirt, or gas varnish, or recrystallized whatever holding the needle valve open, letting too much fuel in. Try pulling off the fuel lines from the carb and spraying in some Gumout or carb cleaner, let it sit 5 min. Spray again, then blow out the passages in both directions with a compressed air source or a clean separate vinyl hose piece you can blow thru. Make sure the air filter isn't full of silt and dust. (Not enough air can cause this too, but its a bit different...not by much though) After you clear out the carb reconnect the lines and try it again. Let me know what happens. If the set screws were tampered with, I then have another set of steps to follow.

Posted on May 10, 2010

  • Ed Gore May 10, 2010

    And the second cause of flooding is the needle valve is mis-adjusted. The fix for that however requires a complete teardown of the carb. Is the weed wacker old? Because if its new (like 1 or 2 seasons) then I would bet the spray cleaning will do it. Small 2 cycle engines are notoriously sensitive to dirt and dust particles both in the air and the fuel. Remember while you are cutting any dirt and dust kicked up can and does get pulled into the engine. Sometimes the build up makes its way into the carb. Oh, while you are spraying in the cleaner, work the throttle, a lot. And remove the carb cover and spray out the air intake while you're at it.

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