Some common causes of spark plug fouling include: Worn or damaged valve guides or valve guide seals. ... Oil will form heavy black wet oily deposits on the spark plugs. Worn or damaged piston rings, or worn or damaged engine cylinders.
Herein, 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.
Then, how do you prevent carbon buildup on spark plugs? A vehicle left idling for a long period of time will often end up with carbon fouling. When a vehicle is not going to leave soon, turning off the engine will prevent fouling from vehicle idling because it will eliminate carbon deposits.
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.
Using WD-40 to repel water from spark plugs, distributors, alternators, and batteries is a good way to prevent corrosion and keep moisture away. You can also use it to ease the removal of spark plugs, especially if there is any rust or corrosion.
For the optimal functioning of your lawn mower, the spark plug has to be in good condition – which means it must not be wet. If you notice that it is wet, you can take various steps to correct the problem, or you can choose to replace the plug itself so that it does not lead to lasting system damage.
Soft, black, sooty dry deposits on plug indicate carbon fouling. Carbon fouling is an indication of a rich air-fuel mixture, weak ignition, or improper heat range (too cold). Carbon deposits are conductive and can create a path for spark plug misfire.
You may find oil on a spark plug because: Too much oil was mixed with the gasoline. The piston rings (the component that seals piston and cylinder) are failing. ... If valve stems or valve seals are worn, oil can slip past them into the cylinder and coat the spark plug.
To safely clean a spark plug, you should use a wire brush or spray-on plug cleaner specifically designed for this ignition part. You can also use a sturdy knife to scrape off tough deposits. Note: NEVER clean a spark plug with a shot blaster or abrasives.Share to:FacebookTwitterPinterestEmail