Why is my spark plug black on my lawn mower?
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.
Also, what causes carbon build up on lawn mower spark plug?
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.
- The engine requires repeated attempts to start or the engine won't start at all.
- The engine misfires or runs rough.
- The engine starts, but stalls shortly after.
- There is a noticeable increase in fuel consumption during normal equipment use.
Also to know is, what causes wet black spark plugs?
CAUSES OF SPARK PLUG FOULING
Black deposits or heavy ash deposits usually indicates trouble. 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.
Can you clean a spark plug with wd40?
WD-40 removes carbon residue and keeps moisture away from spark plugs and spark plug wires. WD stands for Water Displacement, so if your spark plugs are wet or you need to drive moisture away from ignition distributors, for example, WD-40 is a product you should have handy!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.Causes of carbon fouling include rich fuel mixture, clogged air filter, prolonged low-speed driving or idling, faulty ignition system, retarded ignition timing and spark plug heat rating is too cold.How To Clean Fouled Spark Plugs. 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.Warm up your engine – If you typically drive only short distances, give your engine some time to warm up hitting the road. When the engine works at optimal temperatures, it helps in preventing carbon buildup at your spark plugs.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.
- Rattling, pinging or “knock”-like noises. When spark plugs begin to misfire, you may notice unusual noises from the force of the pistons and combustion not working properly. ...
- Hard vehicle start. ...
- Reduced performance. ...
- Poor fuel economy.