![]() ![]() Trouble starting the engine or rough running.Some of the biggest problems that could arise are: If you try to use the wrong spark plug in your lawn mower, you could end up with some issues. Lawn mower engines are designed to use spark plugs with certain dimensions. What Happens if You Use the Wrong Spark Plug in a Lawn Mower? If you’re looking to replace your spark plug, I would definitely recommend bringing your old plug with you so that you’re sure to get the exact same size. Getting information from the manufacturer is always a good idea.īut, if you’ve misplaced your manual or bought a used mower without one, there are a couple of other options: read the part number written on the spark plug itself, or bring your spark plug into the hardware store and ask for some advice. The best advice I can give to find the right size spark plug is to take a look at your owner’s manual. If you’ve taken a look at the standard lawn mower spark plug sizes but are still wondering how exactly to go about finding the plug you need, look no further. Tips on Finding Your Lawn Mower Spark Plug Size Here’s a lawn mower spark plug size chart with the typical thread measurements for both riding and push mower spark plugs: Thread Measurements Whether looking at Toro, Craftsman, Honda, or Troy Bilt lawn mower spark plug sizes, you’ll find that they all fall into a similar range of thread pitch, diameter, and reach. ![]() Standard Lawn Mower Spark Plug Sizes (with Chart)Īs is the case with cars and motorcycles, lawn mower spark plug sizes have a few standard measures. For example, a spark plug with a heat rating of 6 will overheat at a lower temperature than a spark plug with a heat rating of 8. The lower the number, the more easily the spark plug will heat up. This is described by a standardized rating on a scale from 2 to 12. Since different engines run at different temperatures, spark plugs are designed to be able to tolerate a certain level of heat. If the spark plug is screwed in too far, overheating can occur and gas/oil buildup could occur on the threads. If your spark plug isn’t seated deep enough, it could accumulate oil or fuel around its tip. ![]() There is a wider range of thread lengths and it is very important to use the correct one. The reach or length of a spark plug has to do with how long the spark plug is and how deeply it will be seated in the engine. Thread diameter, on the other hand, is a measure of the width of the threaded section of the spark plug. ![]() This is a very small distance and is measured in millimeters. Thread pitch measures the distance between each individual thread. The size of the thread on a spark plug actually refers to two numbers, thread pitch and thread diameter. Here’s some more info about these three characteristics: Thread Size Knowing a bit about the way spark plugs are sized will definitely help you navigate the parts aisle a little bit more effectively. Different spark plugs are rated to function at different temperatures. Aside from this, the final difference between spark plugs is the heat rating. The two thread dimensions that vary on a spark plug are thread size and thread length. Spark plugs are actually measured by their threads. To explain this, I should describe how spark plugs are measured first. With that being said, most lawn mower engines use spark plugs that fall into a common range of sizes. In short, no, not all lawn mowers use a spark plug that is one universal size. 4 What Happens if You Use the Wrong Spark Plug in a Lawn Mower? Are Lawn Mower Spark Plugs Universal? ![]()
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