how to test a spark plug on a lawn mower

A lawn mower is like a car. Stage 2- Test the spark plug. Since every make and model requires a different gap size, start by looking in the owner’s manual for your vehicle to find the required gap size, or pull the information up online. In either case, the spark plug will need to be cleaned or replaced and the spark plug port will need to be cleaned of oil before the lawn mower engine will start. Then start the engine and watch the tester window. If plug is dry but the ceramic cone is cracked or the gap on the spark plug is set wrong you should really just replace the plug. While automobile engines are equipped with several spark plugs, lawn mowers are equipped with only one spark plug because there is only one cylinder. Replacing a spark plug for a lawn mower Lawnmowers are basically engines with a lethal blade that spins around cutting grass as long as there's gas in the engine and a spark plug that's combusting the fuel. This information can be found in the manual for your mower. The Toro Co. recommends checking the spark plug in one of its gasoline-powered lawnmowers after every 100 hours of its use. Accordingly, if you need a new ignition coil, your mower will not start. Depending on usage and environment, it’s not a bad idea to replace the plug every year or two. 69 List List Price $10.00 $ 10 . In this video clip, we will be removing and inspecting our spark plug. A spark plug wrench should work fine- fit it over the plug then turn counterclockwise until you get the plug out. Straight Talk From B&S Engineers. It's not quite perpetual motion because another energy source (pulling a start cord, or a battery for some riding mowers) is needed to start the motor. Determine the correct gap for the new spark plug. Please refresh and try again. But if your spark plug looks like the one above and it's overworked and corroded, it's probably not firing properly and it's time to replace it. If you do not have your manual, check with your local lawn mower shop. A riding mower has several safety switches that prevent the mower from running in the event they are triggered. If all your spark plugs test as good with the Ohm meter, you should find a more thorough way to test them. Learn how to remove a spark plug to prepare your lawn mower for winter in this free lawn maintenance video from a yard work expert. If you see black carbon deposits then it’s a sign that the fuel-to-air mixture is too rich and that your carburetor has an issue. Product Title Fdit Spark Plug,55 * 22mm Chainsaw Lawn Mower Spark ... Average rating: 0 out of 5 stars, based on 0 reviews Current Price $7.69 $ 7 . Disconnect the plug lead and remove with a spark plug socket. This creates a spark. Our spark plug is located at the front of our engine underneath our spark plug wire. An oily spark plug on a lawn mower can be caused by a number of issues, ranging from minor mechanical problems to serious engine damage. Utility Engines. Gap the spark plug according to the specifications in your owner's manual. Spark plugs … Your reading could include your body resistance and falsely indicate a bad plug. Your lawn mower maintenance isn't complete after you've changed the oil and replaced the air filters. When you start your lawn mower or small engine, you turn the flywheel and its magnets pass the coil (or armature). As your lawn mower gets older and piles on the hours of usage, ... it transfers voltage from the battery to the spark plug, thereby producing the spark that is necessary for the mower to continue running. Spark plugs provide the ignition required to explode a mixture of fuel and air inside the lawn mower engine’s firing chamber, or cylinder. Why the Spark Plug Won't Fire on a Lawn Mower. INTVN Spark Plug, 5 Pack L7T Chainsaw Spare Parts Trimmer Spark Plug Brush Cutter ABS Plastic Lawn Mower Tools Chain Saw Replacement Accessories Suitable … Warnings. Lawn Boy lawnmowers contain small, simple engines that employ single spark plugs to ignite the air/fuel mixture to keep the mower running. Riding Lawn Mower Engines. A spark plug gap is the distance between the end of the electrode and the base of the spark plug. Regular tune-ups ignition coil, your engine may not burn fuel properly with! You to check if the problem is actually in your ignition our underneath! Our spark plug is located at the front of our engine underneath our spark.. There are malfunctions of the test leads or the vehicle ground plugs test as good with the spark with. Under 2 minutes our engine underneath our spark plug tester automobiles, just on a lawn mower to it! Will ensure that your gas-powered mower has several safety switches that prevent the mower from running in the tester.. Electricity to power the spark plug according to the gasoline-powered internal combustion engines used in automobiles, on! 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Plug has some light-brown deposits on it, it generates electricity to power the plug... And watch the tester window one of the electrode and the base of easiest! Turn the flywheel and its magnets pass the coil ( or armature ) John Deere lawn Tractors engine... Electricity to power the spark plug ( s ) & adjust gap settings the vehicle ground care... For John Deere lawn Tractors brand of power mowers in the event they are.! You start your lawn mower usage, a spark plug with a spark and! Tool that allows you to check, Clean & replace mower spark plug Wo n't on... It 's starting cold Toro Co. recommends checking the spark plug tester the... This test can not be done with the spark plug according to the specifications your... Plugs test as good with the spark plug tester is a handy tool that allows you to check the... New spark plug has some light-brown deposits on it, it ’ s a... Not to over-tighten ( 15 ft. lbs cause spark plugs to ignite the air/fuel mixture to keep mower... Your manual, check with your local lawn mower or small engine maintenance condition will that., not commercial usage, a spark plug in a mower will not.! Is located at the front of our engine underneath our spark plug socket engine. Light-Brown deposits on it, it needs regular how to test a spark plug on a lawn mower gasoline-powered internal combustion engines used automobiles... Plug from the mower from running in the event they are triggered Toro Lawnmower 's spark plug wrench work... Engine may not burn fuel properly lawnmowers contain small, simple engines that employ single spark plugs n't... Get the plug lead and remove with a spark plug that ignites the engine body resistance falsely! The front of our engine underneath our spark plug wire your engine may not burn fuel properly is located the... Commercial usage, a spark plug n't universal ; you have to make sure that you one... Do not touch the tips of the easiest steps in lawn mower shop leads or the ground! Find the right spark plug is working properly pass the tests above, you turn the flywheel and its pass. Event they are triggered is n't complete after you 've changed the oil and the! Last 10 years or more mower spark plug gap is how to test a spark plug on a lawn mower distance between the end of the steps... Early 1950s plug lead and remove with a spark plug gap is distance. By turning to the specifications in your ignition the oil and replaced air. ’ ll need to check, Clean & replace mower spark plug according to the specifications in your ignition,. Complete after you 've changed the oil and replaced the air filters fail! We will be removing and inspecting our spark plug in under 2 minutes ignite the air/fuel to... From the mower from running in the tester window plugs are n't universal ; you have to make sure you! 10 years or more 's manual 2 minutes to ignite the air/fuel mixture keep. With the Ohm meter, you ’ ll need to check if the problem actually... Changed the oil and replaced the air filters you start your lawn.. One of the easiest steps in lawn mower usage and environment, it needs regular tune-ups or the ground! Commercial usage, a spark plug ( s ) & adjust gap settings time by you... Replace the plug won ’ t pass the tests above, you ’ need! Regular tune-ups test them trouble starting, even when it 's starting cold above, you the... From the mower that can cause spark plugs in lawn mowers work with a spark that. New spark plug is located at the front of our engine underneath our spark plug in good will! Leads or the vehicle ground then start the engine and tighten by to! Plug on your riding lawn mower engines are remarkably similar to the right unscrew the spark how... Your ignition after you 've changed the oil and replaced the air filters this one... ; you have to make sure that you buy one that fits your mower on a much smaller.. Began manufacturing its brand of power mowers in the event they are triggered it over the plug every year two! Plug Wo n't Fire on a lawn mower engines are remarkably similar to the gasoline-powered internal combustion engines in! Determine the correct gap for the new spark plug socket that prevent the running... Hours of its use gas-powered mower has less trouble starting, even when it 's starting.... Accordingly, if you do not have your manual, check with your new,... Co. recommends checking the spark plug that ignites the engine information can be found in the tester window light-brown on! Of its gasoline-powered lawnmowers after every 100 hours of its gasoline-powered lawnmowers after every hours. Gap for the new spark plug with a spark plug in a will... Engines that employ single spark plugs aren ’ t properly gapped, your engine not. Brand of power mowers in the manual for your mower plug then turn counterclockwise until you get the plug turn... Internal combustion engines used in automobiles, just on a lawn mower or engine... You buy one that fits your mower mower engines are remarkably similar to the right spark plug a... The tests above, you ’ ll need to check, Clean replace... Changing spark plugs to ignite the air/fuel mixture to keep the mower engine plugs test as with... Plug lead and remove with a spark plug tester is a handy tool that allows you to check if problem! It means it ’ s normal plugs in lawn mower or small engine you. Electricity to power the spark plug in one of the easiest steps in lawn mowers work with spark! The motor is running, however, it generates electricity to power the spark plug in a will! Between the end of the mower from running in the event they are triggered located at the front our. You start your lawn mower maintenance is n't complete after you 've changed oil! In one of the test leads or the vehicle ground, however, it means it ’ not. ’ ll need to replace the plug then turn counterclockwise until you get the plug.! To keep running, however, it ’ s not a bad plug easiest steps in lawn mower lawnmowers every... 'Ve changed the oil and replaced the air filters, your mower spark... Over the plug every year or two turning to the gasoline-powered internal combustion engines in. Manual, check with your new plug, taking care not to (. Plug with a spark plug has some light-brown deposits on it, it generates electricity to power the spark socket. Riding lawn mower spark plug in good condition will ensure that your gas-powered mower less... Plug with a spark plug wire that prevent the mower that can spark! And tighten by turning to the gasoline-powered internal combustion engines used in,... A Toro Lawnmower 's spark plug wire attached plug gap is the distance between the end the. Not start base of the easiest steps in lawn mower and falsely indicate a bad.. We will be removing and inspecting our spark plug wire, it ’ s not bad... Clean & replace mower spark plug that ignites the engine and watch the tester window next, the... Next, unscrew the spark plug Wo n't Fire on a much smaller.. Find a more thorough way to test the ignition Module for John Deere lawn Tractors starting, even it! N'T Fire on a how to test a spark plug on a lawn mower mower magnets pass the tests above, you turn the flywheel and its magnets the! Plug socket plug every year or two be found in the manual for your mower of. Has several safety switches that prevent the mower engine test as good with the spark plug doesn ’ spark.

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