Bad mower spark plug

Thriving Yard is an affiliate for companies including Amazon Associates and earns a commission on qualifying purchases. Sometimes identifying if it actually is the spark plug that is the problem can be a challenge. Read on to see what makes a spark plug go bad, how to tell if bad mower spark plug has reached the end of its life, how to reinstall one, and when it needs replacing.

The job of a spark plug is to ignite the fuel and air mixture that the carburetor sends to an engine cylinder. The energy created from this combustion process is what powers your equipment. If the spark is weak, this process cannot happen effectively. The most common symptom of a bad spark plug is that equipment is harder to start than normal. A mower with a pull cord may take several more pulls before the engine fires up. If your mower has a key start, it will simply fail to start. In this case, the spark created by the spark plug is too weak to ignite the fuel and air mixture in the cylinder.

Bad mower spark plug

Due to carbon build-up and a weakened electrode, a small engine spark plug will degrade over time. Fortunately, the spark plug is one of the easiest engine components to replace. This step-by-step guide will teach you how to tell if a lawn mower spark plug is bad along with tips for testing other garden equipment. The ignition process relies on a suitable balance of fuel and air being drawn through the carburetor into the engine, a properly operating ignition coil , and a functioning spark plug. The flywheel has permanent magnets built into it, and as it moves past the ignition coil a magnetic field is created which induces electricity, allowing the ignition coil to send a high-voltage pulse to the spark plug. When the piston reaches the top of the cylinder, the spark plug ignites the compressed fuel and air mixture, forcing the piston back down. The spent fuel exits an exhaust port, fresh fuel enters the intake port, and the combustion process is repeated to keep the engine running. Repair Clinic stocks the appropriate spark plugs that fit the engines on all outdoor power equipment, including Craftsman , Honda , Toro , Echo , Poulan Pro , Ryobi , and Troy-bilt models. Plus get amazing DIY repair secrets! Claim Your Discount. How does the spark plug work? The engine misfires or runs rough. The engine starts, but stalls shortly after. There is a noticeable increase in fuel consumption during normal equipment use.

In this case, the spark created by the spark plug is too weak to ignite the fuel and air mixture in the cylinder, bad mower spark plug. The fastest way to fix this problem is to remove the spark plug to drain out the fuel.

The air is warmer and the grass is growing — time to break out the lawn mower. Unlike your car, your lawn mower and other lawn and garden equipment are not used regularly and the time spent sitting in storage can lead to problems with them running properly. When you take your mower out for the first time, you may encounter a variety of situations. If you are lucky, the lawn mower will start with the first pull of the cord. Unfortunately, after months of sitting around, it is likely your lawn mower may not run smoothly, or even start at all.

Are you experiencing problems with your lawn mower? Our team has a wealth of experience in diagnosing and fixing such issues. We can guide you through the steps to identify and fix the problem, ensuring your lawn mower is back in action as soon as possible. A bad spark plug in a lawnmower causes hard starting, poor performance, stalling, misfiring, and increased fuel use. Check the gap, and clean or replace the plug. Use the same type and gap. Remove the wire, unscrew the old plug, insert the new plug by hand, fully tighten it with a wrench, and reconnect the wire.

Bad mower spark plug

From this guide, you will learn How to tell if a lawn mower spark plug is bad. This guide will quickly help you find and remove your spark plug and use five 5 simple steps to determine whether your lawn mower spark plug is bad. The most common way to tell if your lawnmower spark plug is failing is that the engine is more difficult to start. Your push mower engine may stutter and take several pulls to start. If you have a sit-on tractor mower, the engine may not start on the first turn of the key. You may also experience loss of power and slower acceleration. These may appear subtle at the start, but over time, they can become more and more apparent, and these signs point to a bad lawn mower spark plug. A: The spark plug is an electrical component that fits into the engine cylinder head, and its job is to spark the ignition of the fuel to create combustion within your engine. Knowing why a well-conditioned spark plug is so essential to run a Lawnmower engine effectively is helpful to know the job of a spark plug.

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If this is the first time you have tried to start the engine since last fall, fresh fuel may be in order. Use the spark plug socket as needed and be sure not to overtighten the spark plug. The flywheel has permanent magnets built into it, and as it moves past the ignition coil a magnetic field is created which induces electricity, allowing the ignition coil to send a high-voltage pulse to the spark plug. Other causes could be a fouled spark plug or a dirty or clogged fuel filter that restricts the amount of fuel getting to the carburetor. If the filter is dirty, it should be replaced. Its summer — time for yard work The air is warmer and the grass is growing — time to break out the lawn mower. If it appears dark black, change it. Equipment Parts. Find My Part. Look at the Fuel Filter The fuel filter keeps dirt and contaminants in the fuel from getting into the carburetor. If the spark plug is in good shape but the electrode end is black with carbon, you can clean it with a wire brush. In many small engines, the gas cap also has a vent that serves as the fuel tank ventilation. Due to carbon build-up and a weakened electrode, a small engine spark plug will degrade over time.

If you have spent any length of time using a gas-powered lawn mower, you may have come across the problem of a bad spark plug. A spark is needed for the internal combustion engine to run, and a spark plug is essential to the function of your lawn mower.

The problem could be the age of the fuel in the tank, dirt or debris in the carburetor or an obstructed fuel tank vent. For a few dollars, this easy fix can get your small engine working again. Troubleshooting Lawn Mower Starting Problems. Source: Champion Auto Parts. Technical Resources Technical Tips. Sources: Manitoba University , Champoinautoparts. Check the amount, color and consistency of the oil. Careers About Us. Unlike your car, your lawn mower and other lawn and garden equipment are not used regularly and the time spent sitting in storage can lead to problems with them running properly. Change the gasoline If this is the first time you have tried to start the engine since last fall, fresh fuel may be in order.