Always take this safety precaution before performing any repair or maintenance on your mower. This prevents it from starting and causing injuries. Remove the air filter and its housing. Use soapy water to clean a foam filter. Once it dries completely, smear a light engine oil coating over its surface to help capture dirt and prevent it from ending up in the carburetor.
Wipe dirt out of the filter housing before installing the filter. Drain the gas tank, clean the gas bowl, and add a fresh batch of fuel. Or you can inject fuel cleaner to clean the fuel line. After changing the fuel or injecting fuel cleaner run the lawn mower as usual. Caution: Make sure the fuel is below the maximum gauge level. This is for a new carburettor and a gasket set. Another quick tip now you know how to make your engine last forever, is to remove the spark plug from your lawnmower and wire brush the grass off the underside of the deck.
The problem I see most often that causes people to replace their lawn mower is that the engine is still working long after the deck has a hole in it!! Remove the spark plug before you start any lawn mower repair. If your lawnmower has a valve to turn the fuel flow on and off, then you should shut this off now. Remove these two bolts and set the air filter box aside.
Now you will be able to see where the fuel line connects to the carburettor. Take a clamp or a set of mole grips and clamp the fuel line then pull the fuel line off the side of the carburettor. Next, take a photo looking down from the top of the carburettor and be sure to take a few photos of where any linkages connect to the carburettor. Unhook the linkages and remove the carburettor from the lawnmower.
Take a small container and put the carburettor in it and tip it upside down to remove any old fuel. Next, undo the bolt on the bottom of the carburettor and take off the bottom bowl part of the carburettor. You will now see a needle attached to a float just pull out the retaining pin and move the float out of the way taking care to not lose the needle!
Looking from the bottom you will see the main jet, you will need a small flat-headed screwdriver to remove it. Unscrew the main jet and take a look at all the tiny holes! Take some carburettor spray and give everything on the carburettor a good spray up. If you have a compressor you can blow everything out with compressed air but if not you can get a can of compressed air to do the same job very cheaply.
Check out this video on how to service this type of carburettor. Make sure everything is completely clean and dry and re-assemble the carburettor. Hook the linkages back on top of the carburettor FIRST before sliding the carburettor back onto the lawnmower.
Refit the bolts through the air filter box refit the air filter and re-fit the spark plug. There are a few things you can do to avoid having to do this small maintenance procedure so often.
Visually inspecting the petrol tank is a great idea, take a look to see if there is any debris floating around or any rust in the metal petrol tank. All these little pieces will find there way into the carburettor and cause hunting problems. Start the mower and allow it to run for 5 minutes.
Then slowly adjust the screws tighter or looser in turn until the mower runs and idles smoothly. A particularly simple fix that can be at the bottom of many lawnmower idling problems is old or contaminated fuel. If the fuel has been left in the mower while it was stored over the winter or while the mower has remained unused, drain it and replace it with fresh fuel.
If you have gas-powered blowers and trimmers that use a mixture of 2-cycle oil and gasoline, check to see that you've not placed that mixture in the lawnmower inadvertently. Amie Taylor has been a writer since Book reviews, gardening and outdoor lawn equipment repair articles and short fiction account for a handful of her published works.
Taylor gained her gardening and outdoor equipment repair experience from working in the landscaping and lawn-care business she and her husband own and operate. By Amie Taylor Updated December 28,
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