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Starts but won't stay on? Replaced plug, burned off assestor, turned throttle screw checked fuel lines and filters

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  • Amy Nicholson
    Amy Nicholson Apr 03, 2015

    to clean the carb, is that something we can do ourselves?

  • Eugene Rounds Apr 03, 2015

    Not so hard if you have an ultrasonic cleaner; otherwise, depending the exact equipment it is sometimes just as cost effective to replace the carburetor.

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Sounds like the carburetor is needing cleaning and rebuilding. Once rebuilt then the fuel mixture needs resetting if the carburetor has these adjustments.

The diaphragms harden over time and the internal filter clogs. The internal filter screen that both Walbro and Zama using now tends to clogs rather easily but the replacement version in the kits doesn't.

Posted on Apr 03, 2015

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1 Answer

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Air cleaner may be plugged. This sounds like too much fuel going into the engine. When you serviced the carburetor, did you replace the diaphragm in the lower chamber and check the needle valve that the diaphragm operates? Did you clean or replace the fuel filter in the tank? If everything has been taken care of, turn both jet screws CW to stops (lightly), then back each out CCW 1-1/2 turns. Start the engine and allow to warm up. Pull the throttle full on, and turn H jet needle CW until the engine starts to speed up. Proper final adjustment is when the engine 4-strokes, but immediately 2-strokes when cutting. Release the throttle and adjust L jet needle CW so that the engine idles fairly well, but will allow the engine to 'follow the throttle'. Adjust idle speed screw so that the engine continues to run, but the chain does not try to turn. Hope this helps!

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1 Answer

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1 Answer

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