You will probably have to hold the throttle wide open to get it to start with a flooded engine. To fix a flooded engine, turn off the gas, tip the bike over to let out possible excess gas, and then let it sit for at least several minutes for the gas to evaporate out. Engine got floodedĪ flooded engine will surely get the spark plug wet and often foul it.Įngine flooding can occur from tipping your dirt bike over if it’s carbureted, taking too many kicks to start the bike, or stalling the engine when the jetting is too rich. If your spark plug is wet, take a quick check to see if your choke is off and functioning properly. The choke allows more fuel into the mixture, which is great for starting a cold engine, but it will be too rich and run poorly once the engine is warm. It’s best to use ethanol-free gas because it lasts longer before going bad.īad gas from an infrequently used pump station can also happen. Gas goes bad by breaking down and absorbing moisture from the air over time. Poor fuel quality will also cause problems. 91 octane premium pump gas is generally sufficient for most 2 stroke dirt bikes. Any higher does not produce more power unless the compression ratio is higher than stock. Use the recommended octane for your 2 stroke by the manufacturer. Higher octane fuel, such as race gas, will run rich and make the plug wet over time if not jetted appropriately. Using the wrong fuel or poor quality gas can cause a wet spark plug. Low coolant level may mean the head gasket is blown. If your spark plug is wet, take a quick peak at the coolant level. This will cause it to run poorly and possibly sound differently. Coolant may leak into the cylinder and get into the air-fuel mixture. Blown head gasketĪ blown head gasket can cause a wet spark plug. Further inspection must be done to determine what exactly is worn out in the top-end of the engine. You can test the compression to see how it compares to stock. Low compression is most commonly caused by a worn top-end. This results in excess smoke out the exhaust, a buildup of carbon on the piston and exhaust port, as well as a wet spark plug. Since it can’t be fully compressed and ignited, some of the fuel goes unburnt. Low compression means that the engine cannot compress the air and fuel mixture to properly burn it. Doing this has saved me a lot of money and time in the long run. It’s best to do one thing at a time and test to confirm your repair. You must troubleshoot it so that you don’t start replacing parts without knowing where the real issue is. Let’s look at each cause to determine what the root of your problem is. So, now that you know some possible reasons why your spark plug is wet and/or fouled, it’s time to figure out how to fix it. This can easily be caused by poor jetting, but that’s not always the case. Too much fuel (wetness) and the spark plug will foul.Ī wet fouled spark plug will generally be black as well due to the rich mixture. Here are the most common wet spark plug symptoms:Ī wet spark plug usually means that the air fuel mixture is too rich. This is why I want to show you how to do 2 stroke spark plug diagnose and fix the root problem. Riding your dirt bike with a wet plug will greatly increase your chance of breaking down and getting stranded. This results in a dirt bike that won’t run or start. If it gets too wet, the spark will not be able to ignite the mixture and eventually foul the plug.
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