![]() ![]() ![]() Attempt to start the engine but stand clear of the tester or any other electrical component to avoid a shock.Attach the ignition tester clip to the spark plug and insert the opposite end of the tester into the boot.Remove the ignition coil wire and boot from the spark plug.If you’re uncertain whether the spark plug, the ignition coil, or another part of the engine’s electrical system is at fault, you can use a small engine ignition tester to test the components: Use an ignition tester to test a bad lawn mower spark plug The spark plug itself appears damaged or corroded with carbon build-up or rust.There is a noticeable increase in fuel consumption during normal equipment use.The engine starts, but stalls shortly after.The engine requires repeated attempts to start or the engine won’t start at all.Garden equipment & lawn mower bad spark plug symptoms The spent fuel exits an exhaust port, fresh fuel enters the intake port, and the combustion process is repeated to keep the engine running. 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 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. As the piston travels downward, it draws the fuel and air into the engine’s combustion chamber. When the engine’s starter rope is pulled, the starter engages a drive cup on a flywheel and rotates a crankshaft which moves a piston up and down within the engine cylinder. 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. All gas-powered lawn mowers and snowblowers, along with hand-held products like chainsaws, string trimmers, and leaf blowers, use a spark plug to ignite a mixture of fuel and air to start and run the equipment’s engine. If you’re wondering how to check power equipment spark plugs, first you need to know how they work. 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. Fortunately, the spark plug is one of the easiest engine components to replace. If the engine on your lawn and garden equipment won’t start, or it runs poorly, chances are the spark plug is worn out. We encourage you to consult with a certified technician or mechanic if you have specific questions or concerns relating to any of the topics covered herein. Under no circumstances will we be liable for any loss or damage caused by your reliance on any content.Due to carbon build-up and a weakened electrode, a small engine spark plug will degrade over time. The content contained in this article is for entertainment and informational purposes only and should not be used in lieu of seeking professional advice from a certified technician or mechanic. Learn more about Champion spark plugs for boats, find your boat part, or find where to buy your boat part today. ![]() Sooting can occur which can ruin your boat’s engine. If a bad spark plug remains in your engine for the long period of time, the effects can be devastating to your engine. What happens if I don’t change my boat’s spark plugs? For further recommendations, consult your owner’s manual or your trusted boat mechanic. The length of time between spark plug changes depends on variables such as how many hours you use your boat and how you are using it. An easy fix, for a few dollars you can get your boat engine running again. If the spark plugs show signs of damage or fouling, new ones may be in order. If the plug is black with soot, it can mean that the fuel has too much oil while an eroded plug can indicate a too-hot plug. A wet spark plug can indicate water in the fuel while a white residue on the plug can point to a plug that is too hot. A normal spark plug will appear dry with a grayish color. A fouled spark plug occurs when the plug isn’t burning fuel normally, leaving damage to the plug which can cause the engine not to start. Next, check the spark plugs for signs of fouling. Inspect the spark plugs for damage to the insulator tip, boot and upper and lower insulators. To know for sure if a fouled or damaged spark plug is the cause of your boat’s engine issues, you’ll need to examine the spark plugs. ![]()
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