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 or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Spark Plug: Service Precautions

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 kg/cm2, 85.0 psi).
(3) Do not attempt to adjust the plug gap.