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Motorcycle Tip - How to Tighten a Spark Plug

Here's a Motorcycle Tip compiled from responses from several forum members.

Most do-it-yourself (DIY) motorcycle mechanics change their own spark plugs. Most also don't know how much to tighten them to seat properly. Consult your owner's manual for instructions on how to change the spark plugs. Bear in mind that most manufacturers will provide instructions that will get the job done with a minimum chance that the casual mechanic will screw something up.

First, perform the following steps:

  • Ensure that the area around the spark plug hole is clean before removing the old plug.

  • Make sure the threaded area of the new plug is clean and dry. Resist placing any oil or WD-40 on the threads.

  • Insert the plug making sure that it is threading correctly. You don't want to damage the hole by cross-threading.

There are at least two schools of thought on how to tighten a spark plug.

  • Use a Torque Wrench

  • If you can find a specification in your owner's manual as to how much to tighten the spark plugs, use that value with your torque wrench to tighten the plug. Since many people do not have access to a torque wrench, you may want to try the second option.

  • Tighten by Hand

    • Tighten with your fingers until you feel the crush washer starting to seat at the bottom.

    • Tighten 1/4 to 1/2 turn more.

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