Question about Briggs & Stratton Briggs Stratton Lawnmower Lawn Mower Short Block

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I have a 5.5 OHV Briggs & Stratton and it only runs good when it almost fully choked or half choked. There is one adjustment screw on the carb., but when I adjust it , it does not seem to run any better. When the choke is open it kills. What's wrong?

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The carburetor needs to be cleaned. There is something in one of the passages that is keeping it from running correctly. To do this you will need a can of carburetor cleaner (spray) and a very thin wire to probe in all of the holes of the carburetor. First, take the carburetor loose from where it mounts to the engine. Then take the wire and probe all of the holes in the carburetor, and also the holes in the fuel bowl nut (if any are present). Then shoot the carburetor cleaner through the holes to remove any loose particles of dirt or debris and to make sure the passages are clear. After you have done this, then you will need to blow through the holes to make absolutely sure that everything is removed that could be blocking either fuel or air from passing through the carburetor. Re-install the carburetor back onto the engine, and check to see if the unit is running ok. If at this point the carburetor is still not running correctly, you may have to replace the carburetor. When you go to the parts counter you should have the MODEL, TYPE, and CODE off of the flywheel housing. These numbers are stamped into the metal. I hope this helps you out.

Posted on Apr 07, 2011

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