Occasionally during use, you might find that your Honda lawn mower backfires. A lawn mower backfires when burning fuel enters the exhaust or the engine. This happens when pockets of unspent gasoline enter the engine or exhaust system before the valves close.
Backfires occur due to rapid deceleration, faulty components, and even incorrect fuel blend, among other causes. Want to know more about why your Honda lawn mower is backfiring? Read on as we discuss proven ways to fix a backfiring lawn mower.
Below are some of the leading causes of backfiring in Honda lawn mowers. Lawn mower backfires mostly occur during rapid deceleration when the engine attempts to align its timing with the lowered throttle. In most cases, this tends to lead to excessive air in the mix, which in turn creates a lean blend. Slowing down a small engine should be gradual.
The engine speed increases when using a lawn mower, and shutting it abruptly means the engine could pump some stray gas into the muffler, which could lead to combustion. To prevent backfires when turning off your Honda lawn mower, reduce the mowing speed gradually, and allow the motor to idle for roughly 20 seconds before turning it off. Fuel blend is a crucial aspect to consider when dealing with small engines.
Most Honda lawn mowers struggle to burn this blend effectively, which often results in power loss and occasional backfires. Since lawn mowers are designed to handle specific blends of gasoline, using a wrong blend can lead to system imbalances. Due to this, it is advisable to use gas containing zero alcohol levels.
If zero-alcohol blends are hard to come by, go for blends that contain low levels of alcohol. Water is another major cause of backfiring and loss of power in mowers. Afterward, carefully remove the carburetor and clean it thoroughly. Latin America. Engine Innovations. Portable Generator. Pressure Washer. Why engines matter. Petrol Lawn Mowers. Pressure Washers. Care Products. Snow Blowers. Water Pumps. Related Links. In this case, the fuel would not ignite in the cylinder and would rather ignite on reaching the muffler which results in a backfire.
A lawn mower with a damaged spark plug would run unreliably and may break down any moment during the mowing. If the spark plug is the cause, replace it and then test the mower. Sometimes the mower backfires during shutting down because you are slowing down the speed at a faster speed.
The gas may ignite in the muffler causing a backfire. To remedy this, make sure that you decrease the speed gradually and let it sit idle for at least 10 minutes before turning off the mower.
The timing of engine processes is very crucial for smooth functioning. If your mower is backfiring, check the timing of the motor. If the motor is set at the wrong timing, the fuel may ignite while the valves are still open causing a rapid backfire.
Even if you set the right timing in the first place, after prolonged use, the timing between the valve and the engine can be disturbed and needs to be readjusted.
The two valves of the engine serve the purpose of sealing and firing. One of the valves is responsible for letting the gas and air mixture into the combustion chamber. The other valve opens and allows the exhaust gases to leave the combustion chamber. If the valves are sticky and take longer to close, the gas mixture can escape the chamber and enter the muffler. There are chances that the gas may ignite in the muffler causing backfire and power loss.
As valves are an internal component of the engine, it is not possible to repair them at home. The repair or replacement of the valves requires the tearing down of the engine and it is best to leave this task to the professionals. If you have tried everything and still have to get scared of the loud bang every time you operate your mower, consider installing a piece of anti-backfire equipment into your mower. An anti-backfire solenoid immediately blocks the flow of fuel at the carburetor once the ignition switch is turned off.
This keeps the fuel from getting anywhere else such as into the muffler and causing a backfire.
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