Fouled or Rich Spark Plugs Oil Fouled Carbon Fouled Too Cold Cold or Rich But OK Good Spark Plugs Good Spark Plug Real Good Spark Plug The Best Spark Plug Good Spark Plug Lean Spark Plugs Hot or Lean But OK Too Hot or Lean Pre Ignition Range What is a Plug Chop?Ī plug chop is when you check the condition of your spark plugs at different throttle conditions. Use the images below to help you diagnose your spark plug conditions. Use this spark plug chart to help determine what needs to be adjusted with your fuel mixture or if you need to get hotter or colder plugs. Hotter plugs have longer electrodes and cooler plugs have shorter electrodes. If it’s too cold, the plug will get fouled and stop firing. If you have a plug that gets too hot and fires are the wrong time consistently, it can burn a hole in the top of your piston. The heat range of a spark plug determines when it will fire. Cooling problems – dirty fins, no/low water for water cooled engine, low engine oil.Too hot a heat range spark plug for your engine.If you run it too long like this, you can ruin your engine and burn holes through the tops of your pistons.Ĭommon causes for white spark plugs include: White plugs are caused by engine overheating. If your spark plugs are white, you’ll want to fix the problem as soon as possible. Whenever you are rejetting or tuning your carburetors, a plug chop can take away a lot of the guess work.Ī plug chop will tell you how your engine is running a certain throttle positions.
If your motorcycle does not seem to be running right, take a look at the spark plugs.
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