Straight Talk From B&S Engineers. Depending on your brand and model, the spark plug may be located along the back of the engine or on the front, but is easy to identify by the wire clipped onto its tip. How to Change a Toro Lawnmower's Spark Plug. Whether you start the engine with a pull rope or the turn of a key on an electric start motor, you're relying on the ignition system to produce a spark inside the combustion chamber. Note: If you’re inspecting Spark plugs on Outdoor lawn equipment, and aren’t very familiar with small engine maintenance – check out how to tell if a lawn mower spark plug is bad Note: The contents of this article are designed for informational purposes, and to help you quickly navigate the various conditions. Depending on usage and environment, it’s not a bad idea to replace the plug every year or two. In this video clip, we will be removing and inspecting our spark plug. If your spark plug doesn’t pass the tests above, you’ll need to replace it. Insert a new spark plug and tighten by turning to the right. Reconnect the negative battery cable. Gas-powered lawn mowers work with a spark plug that ignites the engine. 00 Your lawn mower maintenance isn't complete after you've changed the oil and replaced the air filters. Spark plugs are rather simple devices operating on electricity generated by the running engine. If your Honda mower does not spark, ... the plug won’t spark. When the spark plug doesn't fire or fires intermittently, your lawn mower engine won't start, or if it does start, it will stall. If your lawn mower doesn't start, the problem could be with the spark plug or ignition system. SIGN UP. Warnings. A spark plug tester is a handy tool that allows you to check if your spark plug is working properly. Stage 2- Test the spark plug. A spark plug misfire will immediately be evident in the tester window. If all your spark plugs test as good with the Ohm meter, you should find a more thorough way to test them. In ordinary residential use, not commercial usage, a spark plug in a mower will last 10 years or more. (20.3 Nm)) and re-attach the spark plug … 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. This video shows how to replace the spark plug on your riding lawn mower. While automobile engines are equipped with several spark plugs, lawn mowers are equipped with only one spark plug because there is only one cylinder. Disconnect the plug lead and remove with a spark plug socket. Determine the correct gap for the new spark plug. Snow Blowers. You can consult your owners' manual to determine the types your lawn mower can use or take a look at the plug's ceramic insulator, which usually has the number printed on it. Transcript. This information can be found in the manual for your mower. This video from Sears PartsDirect shows how to troubleshoot and fix spark plug and ignition problems, including using a spark plug tester to 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. Sign-up not successful. Lawn Boy lawnmowers contain small, simple engines that employ single spark plugs to ignite the air/fuel mixture to keep the mower running. INTVN Spark Plug, 5 Pack L7T Chainsaw Spare Parts Trimmer Spark Plug Brush Cutter ABS Plastic Lawn Mower Tools Chain Saw Replacement Accessories Suitable … Spark plugs aren't universal; you have to make sure that you buy one that fits your mower. Riding Mower Doesn't Have Any Spark. How to Check, Clean & Replace Mower Spark Plug How to Check, Clean & Replace Mower Spark Plug. 69 List List Price $10.00 $ 10 . 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. Replace with your new plug, taking care not to over-tighten (15 ft. lbs. Since that time, the machines have touted engines made by Lawn-Boy… If your spark plugs aren’t properly gapped, your engine may not burn fuel properly. For these tests you’ll need a plug spanner, an insulated pliers, screwdrivers and a spare plug is useful. However, there are malfunctions of the mower that can cause spark plugs to fail. 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. It can also save you time by allowing you to check if the problem is actually in your ignition. You’ll also need a helper, as we’re not using a spark testing tool, it can be difficult to crank over the engine and at the same time check for spark. 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