Tip & How-To about Briggs & Stratton Briggs Stratton Lawnmower Lawn Mower Short Block

How to Clean Your Lawnmower Carburetor

One of the most common problems with small engines, especially now with Ethanol in fuels is the blockage of the fuel system. Whether you have a Briggs and Stratton engine or a Stihl chain saw, knowing how to clean the fuel system is a good idea.

I start off by specifying the type of carburetor you have. Two common types are bowl type and cube type. Bowl type hold fuel in a bowl before it is used and cube type are used on small multi-axis machines like cultivators or chainsaws.

Bowl carburetors are fairly simple to take apart and clean. You have three major jets and a metering system. The jets include Hi speed (the large holes)
Transfer jets (medium holes) and Idle jets (small holes).
The metering system is a needle and a seating point that will need cleaned or replaced.

I recommend replacing parts rather than reusing because Ethanol can cause microscopic pits that will cause fuel leaking and poor running.

You can obtain parts from a local dealer like www.arcolawn.com or the engine manufacturer. It is always recommended to change your fuel filter, oil and oil filter after this repair to prevent engine damage from diluted oil and debris.

Cube Carburetors are a bit trickier but the same principle. See the following link for the manual to get the settings correct.

Helpful links:
www.walbro.com (Bowl Style)
http://zamacarb.com/tips.html (Cube Style)
www.arcolawn.com (Parts Ordering)

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fuel leaks out of the primer bulb has a nipple with small hole. fuel coming out of the nipple hole. No breaks or tears in the bulb.

ethanol additive in gasoline causes deterioration of fuel system parts, especially primer bulbs. Needs to be replaced...relatively easy for mechanically minded or bring to dealer. Check Amazon for parts...they are cheaper than most dealerships.

Hope this helps....

May 01, 2016 | Briggs & Stratton Briggs Stratton...

1 Answer

I have a Briggs and stratton 8 HP generstor model 197412. When i got it the only way to start i5 was to prime it. I started to clean the carberater and found that the needle float valve was damaged so I went and got a new onebut now it wwon't fire at all. What do I need to do.

Did you make sure you're getting fuel into the carb again? As far as I know, the carb bowl should always have fuel in it: when the float that's connected to the needle valve rises in the bowl, the needle valve shuts and stops the fuel from entering and flooding it. One common thing with those small Briggs engines is that the carbs get gummed up with our ethanol loaded gas. You may want to remove the carb, put a rebuild kit in it and soak it for a couple days. After you do this, I would recommend treating the fuel with ethanol treatment or stabilizer (sta-bil works pretty well) to keep it from getting gunked up again. The last small engine I rebuilt the carb in, I had to rebuild and soak 3 different times before it would move fuel properly. It's aggravating!

Nov 20, 2014 | Measuring Tools & Sensors

3 Answers

Briggs and Stratton 20hp twin cylinder runs only with full choke

Had one on my saw mill had this problem as well Try pulling bowl off bottom of carby as the float can get **** with old fuel especially ethanol fuels as they attract water bowl is normally held on with one center screw on bottom of carby. Note always turn fuel off and let engine run out of fuel as this stops goop from building up in carby

Sep 04, 2009 | Briggs & Stratton Briggs Stratton Intek V...

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