![]() Don’t over-tighten it beyond this point, or you will risk cracking the plug. Then give it another quarter turn to make sure it is sealed tightly. At that point, use the appropriate sparkplug socket and ratchet to tighten the plug down until it stops. Insert the new spark plug into the clean hole and then finger-tighten. Still, it would be wise to double-check it with a spark plug gauge to make sure it matches the manufacturer’s specifications. Most are “Pre-gapped” to match your specific engine. If the electrode looks dry, or there is a strange powdery material on it, there might be a problem with the carburetor, which could be depriving the engine of the fuel it needs. Step 3: Examine the sparkplug, paying close attention to the electrode. Give it ten minutes or so to soak into the tight spaces around the plug. If it doesn’t move with a reasonable amount of force, you should spray it down with a little WD40 or some other type of penetrating lubricant. Sometimes the plug can be a little stubborn. Step 2: Use the spark plug socket to carefully remove the spark plug. While doing so, take an extra minute or two to clean around the plug and wipe away any debris with a paper towel or shop rag. Step 1: Disconnect the lawnmower’s sparkplug wire. Just about any reputable hardware or automotive store can point you in the right direction. Once you get comfortable with it, you will find it’s actually pretty easy, and relatively straightforward. how to change a spark plug in a lawn mower?Ĭhanging a lawnmower’s sparkplug might seem a little intimidating the first couple of times you need to do it. While this might work once or twice, to get you through a mowing session, you should still consider replacing the plug. ![]() In a pinch, you might be able to lightly clean the plug and gently adjust the gap between the electrodes. If you take the plug out and it looks rounded on top or there are some cracks, then it’s probably wise to replace it.Īt the same time, some bad spark plugs will also look black from carbon or degraded excess gasoline. Physically the center of the electrode should have a flat top. This could even cause a lingering smell of raw gasoline while you are mowing.Ī truly bad sparkplug might also show visible signs. ![]() You can leave a response, or trackback from your own site.If you are paying attention, you can usually notice if a lawnmower’s sparkplug is starting to go bad.Ī pull mower might take an increasingly longer number of pulls, or a riding mower might take longer than usual to start when you turn the key.Ī lawnmower with a bad sparkplug might also start to develop performance issues or consume more fuel than usual. You can follow any responses to this entry through the RSS 2.0 feed. If it is dry then gas is not getting into the engine and you will need to recheck and / or clean the carb and gas tank. You will need to recheck that it is gaped properly and that the spark plug is actually receiving a jolt of electricity. If the plug is wet, and you can smell gasoline, then gas is getting into the engine. What’s next? Turn the engine over a few times, remove the spark plug and check for gasoline on the plug. You know there is spark getting to the spark plug and you have either cleaned the plug or replaced it. The shuttle cock is open so gas can get to the carb. If your engine is still running rough or not at all you will have to search for other solutions.Īt this point you know you have gas in the tank. ![]() Make sure you also set the gap on this plug as well. If the spark plug is badly corroded or cannot be cleaned properly, replace it with a new one. Next remove the plug, clean it and re gap it to the specification in your manual. ![]()
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