It leads to the fuel being pumped in the muffler where ignition takes place resulting in a backfire. A backfire while shutting down can also be due to the overheating of the engine. Backfiring mostly occurs at this step. There can be several reasons behind your lawn mower backfiring after shutting down. These points will be further discussed in detail. The gasoline you use may have some part of ethanol or alcohol as a blend. The engine of some lawn mowers such as riding mowers is unable to burn such gasoline properly.
It may lead to occasional backfires. Prefer using pure gasoline to avoid backfiring and power loss. Another reason can be the water contaminating the fuel. If you sense this, empty the tank of gasoline, dispose that off and add fresh fuel to the tank. A carburetor works to regulate the ratio of air and gas needed for proper combustion. An imbalance in the ratio can lead to improper combustion or even no combustion at all. A lean carburetor mixes too much air with too little fuel.
This can lead to backfiring. There are two adjustment screws on the carburetor. One is for idle adjustments while the other screw controls the mixing of gas and air. It is preferable to seek professional services in order to make carburetor adjustments however, if performed carefully, you can make the adjustments yourself.
Some brands of lawnmowers have an electronic solenoid that regulates the mixing of oil and gas. Any issue with the solenoid can also result in backfiring. All rights reserved. Innovations Products YOU. Change Region. United States. New Zealand. Latin America.
Engine Innovations. Portable Generator. Pressure Washer. Why engines matter. Petrol Lawn Mowers. Replace the spark plug for better results. Valves seal off the cylinder, or firing chamber, of a small engine.
One valve opens to allow the gas and air mixture to enter the cylinder, and the other opens to allow exhaust gases to exit the cylinder after combustion.
If the valves stick open too long, even just a little, raw gas can pass over to the muffler. Backfires and poor power result. Repairing or replacing them require tearing down the engine, which may be a job best left to the service professionals. Robert Korpella has been writing professionally since He is a certified Master Naturalist, regularly monitors stream water quality and is the editor of freshare.
Korpella's work has appeared in a variety of publications. He holds a bachelor's degree from the University of Arkansas. By Robert Korpella Updated December 06,
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