Take the cover off the top of the engine. (recoil). check to see if the mechanism is free. it may just need taken apart and cleaned.
How to Identify and Fix Common Gardening Problems ?
We provide a variety of viewpoints on how to identify and fix common gardening problems. Our sources include academic articles, blog posts, and personal essays from experienced gardeners :
Afterfire occurs after the engine has been shut off. Common Causes of Afterfire: Shutting off the engine at high RPM, causing fuel to pump through the engine for ignition. Gasoline that contains alcohol has a tendency to ignite easier, which can cause afterfire.
A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to stall.
Clogged or Dirty Air Filters
Dirty air filters are one of the most common reasons lawn mowers sputter. Dirt can be present in the apertures that lead from the carburetor and the fuel filter and interrupt the flow of fuel supply to the combustion chamber. You want to be sure to clean or replace dirty air filters.
There are a number of things you may do while operating your mower that can cause a backfire, and there are way to avoid them. The primary cause of a backfire is decelerating too quickly. The simple fix for this is just to lower the engine speed a bit more gradually.
You can either clean the air filters, or you can replace them with new ones. If you have a foam filter, you can clean it with a drop of dish soap and warm water. Remember to air-dry them before using them again. But if you have paper air filters, you must replace them during the maintenance of your mower.
Worn bearings about to fail completely often make grinding noises, as well as unusual vibrations. The mandrels holding the mower deck`s cutting blades contain two bearings that need frequent lubrication to keep the bearings working properly. As bearings dry and overheat, seals fail and dirt enters the mechanism.
Common signs include reduced engine performance, black smoke coming from the exhaust, backfiring, overheating, or hard starting.
Use Carburetor Cleaner
Fortunately, you can generally do this without even taking the carburetor out of the engine. Start by purchasing some commercial lawnmower carburetor cleanerOpens a new window, which comes in a simple spray can and will make it easy to clean the inside and outside of the carb.
This sound is the result of friction from the gear teeth meshing inside the transaxle casing. These gears will wear slightly over time, and this sound should decrease. If the noise suddenly becomes louder, we suggest that an authorized service center inspect the unit.
What are the symptoms of bad gas? If your lawn mower is difficult to start, idles roughly, stalls out, or makes a “pinging” sound, you may have a case of “bad gas”.
The primary cause of a backfire is decelerating too quickly. The simple fix for this is just to lower the engine speed a bit more gradually. If you have a throttle that you use to reduce speed, gradually let it up instead of letting it rebound quickly.
When an engine is running rich, it has too much fuel and too little air, which slows down the combustion process. When combustion doesn`t happen in a timely manner, the exhaust valve opens while the air-fuel mixture is still igniting, causing this explosion to “spill” out of the cylinder, making a loud popping noise.
Lawn Mower Backfires Through Exhaust
If a lawn mower is not properly maintained and serviced, it can cause the engine to run too rich, resulting in the fuel and air mixture igniting too late and causing a backfire. Other common causes of backfiring include a dirty air filter, faulty spark plug, or a clogged carburetor.