It’s important you research which spark plug is needed for your mower as different models require different plugs. The ionized gas becomes a conductor and allows the electrons to flow across the gap. The reason for the engine cutting out is often due to the spark being created from the spark plug being too weak to ignite the fuel which mixes with air in the carburetor. An incorrect plug type will lead to intermittent problems. You may have noticed you need to fill the engine with gasoline more often than usual. If the plug is in decent condition, but has some black discoloring due to oil, or is wet with gasoline then this can usually be cleaned up. When you’re having problems with your gasoline-powered lawnmower, a likely cause may be a bad spark plug. A spark plug that has an improper gap will show certain signs and symptoms. Best Way to Get Rid of Weeds in Yard – 7 Easiest Steps. Using a Multimeter is also an easy way of checking a Good vs. Bad Spark Plug. Leaf Blower Techniques – 8 More Ways to use your Leaf Blower! This can be why you may need to leave the lawnmower to cool down if you’ve been trying to start it for a while but it keeps cutting out. 79 If the spark plug is fouling because of a carbon build-up, the reason is likely due to the combustion system of the lawn mower’s engine. Spark Plug Installation Video: “How to Check, Clean, And Replace a Lawn Mower Spark Plug”. The lawnmower has a different spark plug than the automobiles. As noted there, the gap should measure .045". Once removed, the spark plugs condition can tell you if the engine is operating properly and if the spark plug … Locate the spark plug(s). You’ll need a feeler gauge to gap your spark plug properly. The result can often lead to the engine become flooded as more fuel enters the cylinder, due to it not being burnt off effectively. There’s also the option of going to your local hardware store, where you should be able to find a suitable replacement, assuming the stock a wide range of engine parts. Step 5: Connect the boot back on to the spark plug. Examine center of the spark plug, if you see light brown or gray on the insulator, the engine is operating properly and the spark plug is still in good working condition. What is my lawn mower spark plug gap? Spark Plug Gap. How much do lawn mower spark plugs cost? Gapping the plug is a simple job when you know how, and it will make a huge difference to how your mower performs. Also known as L head or Side Valve Engines, these engines are commonly used for walk behind lawn mowers and pressure washers. Small Engine. Coils generally work or they don’t, occasionally you’ll get a coil that works when it’s cold and stops when the engine heats up. The coil has been designed to create sufficient spark to jump a pre determined spark plug gap. Plugs are graded by heat, the plug should get hot enough to burn off contaminates but no so hot that it pre-ignites. Amazon usually stocks pretty much all shapes and sizes so that could be your first port of call. If it’s too wet there may be a problem with the engine choke system. 38. As we’ll have a helper cranking over the engine, that means the blade will be spinning, and even though the engine’s not running, it can still remove body parts, so, you know! Check the size of your spark plug and match the socket to that. As we mentioned once the lawnmower engine is running, it may cut out unexpectedly and for what appears to be no reason. For good performance, the spark plug must be properly gapped and free of deposits. Make sure the engine is cool before you attempt to replace the spark plug. But apart from this difference, all other components will be very similar. Autolite Xtreme Start Spark Plugs. The short answer is yes! As the engine has been running for long periods – the spark plug becomes hotter, which can increase the gap between the spark plug center and the firing electrodes, further weakening the ignition spark. There are various reasons for spark plugs failing but a common one is carbon buildup. The heat range of the spark plug. Contact Us | Spark Plug Gap: The EMS spark plugs have a gap of 0.030 inches. How to Tell if a Weed Eater Spark plug is Bad? Video: Let’s check out”The Top 6 Reasons Your Lawn Mower Won’t Start”. Highest rated. Common reasons a lawn mower has no spark, include: Making matters worse for the plug, is its location – right out front of the engine. MAINTENANCE SPARK PLUG SERVICE Recommended spark plugs: NGK BPR5ES IMPORTANT NOTICE engine damage. You can view the manual online at Manage My Home using the blue link above or the information in the Sources link below . Xtreme Start. Cracked plug insulator – Self explanatory too. Most experts claim you should replace the lawnmower spark plug in a standard mower once per season, or after around 25 hours of use. You can also take a new plug and check its gap using a spark plug gap checker. You can usually match them using the reference numbers on the white insulator. You’ll need to go to the manufacturer’s website or read the manual to see the exact gap in your lawnmower spark plug. Your push mower engine may stutter and take several pulls of the cord to start. Repair your Toro Lawn Mower Spark Plug for less. Once the spark plug is clean you should inspect the plug again, determine if the spark plug threads look good – with no cross-threading evident, and the electrode looks good. How often do I need to change my lawn mower spark plug? Carbon build up in the engine is a normal condition, fuel type, oil type, maintenance and plug type all effect how quickly it builds. The spark plug is connected to high voltage generated by an ignition coil or magneto. All of these will prevent the plug from doing its job. Spark Plugs. When you adjust the distance between the two electrodes it is called gapping your spark plugs. CAUTION! If oil seeps onto the spark plug, it will damage the tip over time. 796112S. The quick fix here, squeeze the terminal until it fits snugly on the plug. What Spark Plug To Use For Lawn Mower – 3 Methods to Choose. Common faults here include, cable out of adjustment, meaning the bail lever doesn't pull the brake to the off position. Watch the spark tester or spark plug, looking for a spark between the electrodes of the tester or spark plug. The spark plug gap is an area of open space between the two electrodes of the spark plug. Dirty plug – Self explanatory, it’s a plug that’s contaminated by too much gas (flooding), carbon, or oil. Replacement Spark Plug Options by. You’ll need to go to the manufacturer’s website or read the manual to see the exact gap in your lawnmower spark plug. The Craftsman 4.5hp mower uses either a Champion model RJ19LM or J19LM spark plug, or equivalent, with the gap set at .030 inch. How to Cut and Remove a Tree Stump with a Chainsaw, How To Keep Grass From Sticking To Mower Deck, Fastest Growing Evergreen Shrubs for Privacy, How Much is a Cord of Wood And Other Firewood Facts, How to Build DIY Compost Bin With Pallets, Cheapest Way to Build a Wood Privacy Fence, How To Remove Mold From Wood & Drywall – Mold Remediation, Sandbags for Flooding | Where to Buy – How to Use, Best Electric Leaf Blower | String Trimmer Combo, Best Cordless Weed Eater | String Trimmer, Best Pressure Washer for Concrete Driveways, weed eaters run on very similar spark plugs. By name A-Z. Spark Plug TimeCutter Twin Cylinder This Toro replacement spark plug helps ensure This Toro replacement spark plug helps ensure optimum performance on your Toro Walk Power Mower, Snowblower or TimeCutter Zero-Turn Mower. If a spark is present, the ignition coil is working properly. The coil has been designed to create sufficient spark to jump a pre determined spark plug gap. In any case, I’d probably look to change your lawn mower spark plug a maximum of every two years just to be safe, even if it’s still performing well. However it’s worth pointing out, getting this test wrong can lead to misdiagnosing and replacing the ignition coil or other parts, unnecessarily. The most common way to tell if your lawnmower spark plug is bad, is the engine being more difficult than normal to start. Step 5: Use a proper gauge to measure the electrode gap of the spark plug. Briggs & Stratton Part Number. These may appear subtle at the start but over time they can become more and more apparent, and these signs definitely point to a bad lawn mower spark plug. You may also experience loss of power and slower acceleration. It’s true, A lawn mower spark plug can give you a hard time if you don’t know it’s working. Disconnect the spark plug lead and clean around it. You can repeat this step 2 or 3 times if needed. FREE Shipping on orders over $25 shipped by Amazon. If it’s powdery and seems too dry there could be a problem with the carburetor mounting gasket or it could be starved of oil. Bad plug gap – A spark plugs function is obviously to create a spark and it can only do this if the electrode gap is correct. A loose terminal will cause the engine to misfire or not start at all. Since the engine only starts due to two principles: Gas & Spark, and assuming you have filled the gas tank – it’s most likely the spark, or a lack thereof. The spark plug gap on your Insight or Insight Gold Mower is .030 or (.076mm). Certified OHV Lawn Mower Engine Spark Plug can be used with Certified 150cc/174cc Lawn Mowers (CT #060-0750, 060-0751, 060-0753 and 399-4888) Helps to provide consistent starts and; Add To Package Add To Cart Quick View.