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Rough idle MTD 20'' 3 5 hp Briggs and Stratton rough idle. The idle never smooths out when running. Almost sounds like it will stall. Trying to fix it for a neighbor. Her mother passed away and left the house to her. Looks like someone changed out the springs that are in the carb area. There is no float bowl as far as I can tell since it's right on top of the gas tank. It's getting gas...maybe an air leak? or the gap not right? any thoughts??? HELP

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  • djtimothy Jun 25, 2009

    You were right on the money and so was my theory. We removed the carb and found the screen almost compltely plugged up. Cleaned it off and it purrs like a kitten now, and to think they thought of throwing it out for scrap metal. Runs great thanks for your help.

  • Frank
    Frank May 11, 2010

    there is a flow adust. look under the throttle cable. there is a little round can. unscrew the can from the buttom.



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You are correct there is no float it is a diaphram type carb.
My suggestion is to remove the fuel tank and carb. as they are hooked as one and come off as one
Note what bolts will have to come off to do this.
Remove air cleaner first Locate the 1/2 bolt near the middle of the tank remove it
now locate the 3/8 bolt in front of the tank to the left of the spark plug and remove it
carefully remove tank and carb. assembly pulling it toward you slowly and watch what is still hooked up like the governor linkage angle tank slightly to allow linkage to come through the throttle shaft hole of the carb.
Once its removed take it to a bench with a phillips screwdriver in hand
Look down at the carb.and notice how it is fastened to the tank and remove the phillips screws that secure it to the tank now seperate carb. from the tank may be stuck pry up on it with a screwdriver to remove it.
see the rubber gasket between the tank and carb.? REPLACE IT. comes as a kit which is called a diaphram and gasket carb. kit. Clean the rest of the carb. while it is off find your kit and reverse this procedure and this should take care of your issue. Known clean fresh fuel to go back once completed.

Posted on Jun 04, 2009


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