Why does my lawn mower spark plug keep fouling?
Carbon Buildup
A fuel and air mixture that is too rich is another cause of incomplete combustion. If the carburetor sprays too much fuel into the combustion chamber, the fuel burns cooler. The smoke that results fouls the plug as well as the air filter and the spark arrestor that covers the engine's exhaust port.
In this way, why does my lawn mower spark plug turn black?
A black, feathery carbon deposit on your spark plugs can be an indication of a weak spark or an overly rich fuel mixture. Causes may include a stuck choke, misadjusted or heavy carburetor float, a leaky injector or carburetor needle valve, low coil output or high resistance in your spark plug wires.
Moreover, what does fouling mean in spark plug?
For optimum performance, your spark plugs should be clean with no damage to the electrodes. If your spark plugs become dirty or fouled, it can affect how your engine runs. A fouled spark plug is a plug that has become covered with a substance like oil, fuel or carbon or one that is blistered from running too hot.
What causes black carbon on spark plugs?
Carbon fouled
Black, dry soot on the electrodes and insulator tip indicates a carbon-fouled plug. This can be caused by a dirty air filter, excessive driving at low speeds, too rich of a fuel/air mixture or idling your vehicle for too long.
Can you fix fouled spark plugs?
Technically, yes, you can clean spark plugs, however, in most cases it's not worth it. We do not recommend it for a number of reasons. Ultimately, you won't get the same performance from a cleaned plug as from a new plug. Electricity discharges best from sharp edges.How do you know if a spark plug is bad on a lawn mower?
Here's How to Know if a Lawn Mower Spark Plug is Bad- You can't get the engine to fire up at all.
- You have to tug extra hard for longer than usual on the rewind.
- Your lawn mower loses power while moving.
- The gas runs out quicker than it used to.
