burnt air filter? bad reed valve maybe?

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rustymaggot

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working on a friends husky 128ld string trimmer. i got it with rotten fuel lines and a carb that wouldnt pump fuel. i replaced the carb with a oem new carb and put in new air filter cause the old one had a hole burned in it. im using canned fuel, so i know the fuel is fresh and good. new spark plug. its burning a hole thru the new air filter. im assuming its backfiring. is this a bad reed valve or something? thanks guys.
 
Sounds like timing is off, check the flywheel hasn’t slipped around on the crank shaft


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