Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la
If it fails: lemon-manuals.org.ua

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Spark Plug: Testing and Inspection

CAUTION: To protect the platinum electrode:
1. Do not use a wire brush to clean the electrode.
2. Use a plug cleaner for a maximum of 20 seconds and air pressure below 589 kPa {6.00 kgf/sq.cm,85.0 psi}.
3. Do not adjust the plug gap.