How can I fix Briggs & Stratton carburetor 42A707-2238?

For all practical purposes, I find that dissasembling the carburator (remember to count the # of turns on your adjustment screws - I.E. air/fuel mixture if equipped, idle, etc) and soaking all the jets and any parts with holes for gas flow in carb cleaner overnight. the next day take and blow your jets out with a air compressoer blow nozzle to ensure you remove anydebris and gum. If all else fails you can buy a rebuild kit although I found its much easier and much more reliable to just buy a new carburator which will give you years of reliability. also, its a great practice technique to install a fuel shut off valve in-line to the carb. when u store the engine for the season simply shut the valve off and run the engine untillthe carb is dry and stalls the engine ensuring you have no gas sitting in your carb. Fuel stabalizer or not, it's just good practice to do so! Jon, East China, MI..

Jon T..
May 2013

john is correct....may also want to buy a new pin and seat looks like a little black washer cost about 5 bucks or so (cheap kind of rebuild kit)

Joe
April 2008

If this carburettor has a round float bowl, you'll see a brass nut on the very bottom. Undo this and the float bowl comes away to reveal the plastic float inside. The float is held with a pin that pushes out, and it brings with it the needle valve that shuts off the fuel supply when the engine is stopped. Its dirt in the needle valve housing that causes your problem and it needs to be flushed out with some carburettor cleaner.

John
April 2008