He holds a bachelor's degree from the University of Arkansas. For a long-term fix, consider modification of the engine housing for less air restriction across the engine. Lawnmower engines are considered "small engines." This is actually an easy fix. If the valves stick open too long, even just a little, raw gas can pass over to the muffler. Hi, my name is Sarah and I’m the chick behind LawnChick.com. The carburetor is responsible for mixing gas with just the right amount of oxygen to create combustion. Valves are an internal component of the mower’s engine. Engine backfires but won't start. The result is a loud backfire. When the mower's backfiring is accompanied by a degradation of power, the cause requires deeper troubleshooting. Riding mowers may not be tuned to burn this type of fuel properly, which can result in occasional backfires and a power loss. My Riding Lawn Mower Cuts Off When the Clutch-Brake Is Released. Sometimes, your mower won’t start at all. Keep your engine clean with an engine degreaser. Fuel tank still 1/2 full with the same gas the that I mowed with last week, what is next? Can the Inproper Mixing of Oil to Gas Cause Leaking in a Weed Eater? A backfire is a loud boom or bang that occurs when the engine slows rapidly. The first thing you must find out is if it backfires through the exhaust or the intake or carburetor side of the engine. A spark plug that is damaged, worn, or has an improperly set gap between its electrodes creates a weak spark. The fuel then pools in low spots along the exhaust. When backfires occur as your lawnmower idles or as you're turning off the engine, the most likely problem is that you're slowing your engine speed too fast. This could strip the threads enough to distort the seal. If the solenoid has a short, the result is sometimes a backfiring, poor running engine. Backfire in engines is caused by simple chemical malfunctions that can be easily rectified. Dirty carburetor / clogged carburetor bowl. If so, you’ve come to the right place! Check the timing of the motor. Several reasons exist, including incorrect carburetor settings and problems with your muffler's construction. These holes allow excess air and reduce engine combustion. In this case, the excess oil will eventually drown out the engine and cause it to die. As a result, the fuel may not ignite in the cylinder, but it might ignite when it reaches the hot exhaust muffler. In most walk-behind mowers they’re covered with a black cable and right in the front of your mower. Written by Andrew T for LawnEq - The specialists for Lawn Mower Parts and Small Engine Parts.

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