Lawn Mower Carburetor Problem Troubleshooting

Is the carburetor on your lawn mower acting up? Find out how torepair it yourself by reading this informative article!

It's a beautifully sunny day and your grass is calling you to give it a first cut for the season. So you go out to your storage shed and you pull the lawn mower out. You fill up the tank with gas, top off the oil, set the throttle and yank the pull start. And, all the lawn mower gives you is a sputter. You now have two options: you can put the machine back in the storage shed and let the grass grow up over it, or you can troubleshoot the problem and fix the carburetor yourself.

A carburetor is an important part of a gasoline powered engine. If it doesn't work, then the engine won't work. Or, the engine might run, but it will sputter and cough and shutter.

But, fortunately you found this free article, so you'll be able to easily troubleshoot your lawn mower problem and save yourself some big money by fixing it yourself!



The first thing to do is to make sure that the gas in the tank is fresh. If some of it was leftover from the last mowing season, then it could have turned into varnish. If this is the case, then you'll have to drain the gasoline tank completely dry. Then, refill the tank with fresh gasoline. You'll also need to clean the varnish and gunk out of the carburetor by adding a good quality fuel system cleaning product to the gasoline. Then, start the lawn mower again and let it run for ten to fifteen minutes. As the cleaning product runs through the fuel system, the engine in your mower should run better as time goes on.

From now on, when you store your lawn mower for the season, make sure that you either drain the tank or add a fuel stabilizer to the gasoline.

If that's not the problem, the next thing to do is to locate the air adjustment valve on the carburetor. Turn it all the way to the right until it won't move any more. Then, turn it back to the left about two turns. Yank the pull start again and put an ear towards the engine when it starts. The air adjustment valve, as its name implies, adjusts the amount of air that goes into the carburetor. If the amount is too much, or, if it's too lean, then the engine won't run right. The mixture of air and fuel that goes into the carburetor has to be the exact right mix.

If the engine still runs rough, and it coughs and sputters, try adjusting the valve to the left and to the right to see if that repairs the problem.

Now let's go back to the rule that the mixture of air and gasoline that goes into the carburetor needs to be the right mix. If there's a a clogged fuel line that runs to the carburetor, the carburetor might be starved for fuel. To check if the carburetor is getting gasoline, locate and take the air breather off. Set the throttle, then give the pull start a yank while you look into the carburetor. If you can actually see gasoline, then you'll know that the fuel is reaching the carburetor.

But, is it getting a sufficient amount of air? Check the air filter and make sure it's clean and in good shape. If the filter is dirty and is a paper construction, you'll need to clean it out by using an air compressor. If, on the other hand, the air filter is dirty and it's made of foam, you can wash it out with warm, soapy water. Then, rinse it thoroughly and carefully squeeze the water out of it. Use an old rag to dry the foam filter, then reinstall it.

Finally, clean the linkages and the springs on the carburetor with a good quality product. Follow the manufacturer's directions on the can in order to get the best results.

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