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.

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.

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.

Attach the ignition tester clip to the spark plug and insert the opposite end of the tester into the boot. Author Recent Posts.

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.

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. But luckily for you, there are a number of pretty obvious ways to tell a lawn mower has a bad spark plug. If your lawn mower will not start at all, no matter how many times you pull the cord or turn the ignition, this could be an indication that the spark plug is bad. There needs to be a spark in the combustion chamber to ignite the fuel, and no ignition may mean that this spark is not present.

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.

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If the engine tries to turn over even for a second and dies, then you have spark. Join our champion Mailing list Join. They are hardy and can withstand a lot of wear and tear. This includes replacing the spark plugs because they are cheap and easy to replace. Parts Lookup Tool. Check the oil Check the amount, color and consistency of the oil. How does the spark plug work? Spark Plug Wrench S. AmpliPHI 3. Sometimes identifying if it actually is the spark plug that is the problem can be a challenge. Find a Dealer. Read on to see what makes a spark plug go bad, how to tell if yours has reached the end of its life, how to reinstall one, and when it needs replacing. Equipment Parts. Due to carbon build-up and a weakened electrode, a small engine spark plug will degrade over time. Contact Us.

From this guide, you will learn How to tell if a lawn mower spark plug is bad.

There is a noticeable increase in fuel consumption during normal equipment use. If you do not see a spark, unclip the tester from the spark plug and attach it to a good grounding location like a bolt on the engine valve cover. Parts Lookup Tool. If this is the first time you have tried to start the engine since last fall, fresh fuel may be in order. In many small engines, the gas cap also has a vent that serves as the fuel tank ventilation. This would indicate the problem probably lies somewhere else fuel, carburetor, valves, etc. Checking Small Engine Spark Plugs. All rights reserved. Battery Storage. Check the air filter The job of the air filter is to remove dirt and debris from the air before it enters your engine. Due to carbon build-up and a weakened electrode, a small engine spark plug will degrade over time. Check the amount, color and consistency of the oil. These problems may also cause excessive fuel consumption, deposits on the cylinder head and oil dilution. In this case, the spark created by the spark plug is too weak to ignite the fuel and air mixture in the cylinder.