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My mower engine was fine last time it was used. This time it is running poorly and very rich. Using excessive fuel. Only runs correctly when fuel is running out. The air cleaner is clear, the governor is working correctly and I replaced the spark plug but no improvement.

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  • Tony Woodruff Apr 03, 2011

    Thanks for the advice, Kiltnar - I should have said it is a Briggs & Stratton 35 classic engine - no fuel bowl, no float to stick. I couldn't get the carby off without undoing 3 head bolts to remove a major bracket, so I took it to the local mower shop! (Against my principles, but sometimes you have to compromise!) - Woody17

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The carburetor has a problem. You can take off the carburetor with a 5/16 socket and a 3/8 socket. Take off the air cleaner cover and remove the air filter. Then remove the air cleaner housing. This is three bolts that can be removed with the 5/16 socket. Take care not to damage the gasket that is behind this. Then the fuel line needs to be crimped. You can do this with lockjaw pliers. Then use a set of regular pliers and take the fuel line off. After this the carburetor has two more bolts that holds it on. They can be taken off with the 3/8 socket. The fuel bowl nut can be taken off with a 1/2 in socket. I would take it off and see if there is anything inside of the fuel bowl after removing it from the engine. If you see a round piece of metal in the fuel bowl then it has dropped a welch plug and the carburetor will need to be replaced.

Posted on Apr 03, 2011

  • Kiltnar Apr 05, 2011

    That carburetor hardly gives any problems by itself. It is usually the gasket and diaphragm that sit underneath the carburetor. For that fix you would need a Briggs and Stratton part number 795083. It has 6 phillips head screws that hold the carburetor onto the fuel tank. You can remove the carburetor from the engine by using either a 7/16 in or 3/8 in socket on the front of the engine, and a 1/2 in socket for underneath the carb body. Then swing the carb down and unhook the linkage that controls the throttle. Then you can remove the carb from the fuel tank. It is one of the most dependable engines that is out there.
    I'm sure the local repair shop appreciates the business. I had one at my work that would not work correctly until I took it completely apart and soaked it in carb dip. That one was a toughie.
    I hope everything comes out like it was new. :)
    You might print off this one and keep it somewhere where you can look at it again. With the mystery fuel that we have now, the diaphragms are not holding up like they used to. So it may have to be done again in a year or two.

  • Tony Woodruff Apr 05, 2011

    Thanks again, Kiltnar - I will keep your comments for future reference!

    Woody17

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