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

Or, hide this message: temporarily or permanently

Spark Plug: Testing and Inspection

CAUTION: To protect the platinum electrode:
a. Do not use a wire brush to clean the electrode.
b. Use a plug cleaner for a maximum of 20 seconds and air pressure below 588 kPa {6.00 kg/sq.cm , 85.0 psi}.
c. Do not adjust the plug gap to protect a platinum electrode.