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)

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Spark Plug: Service Precautions

CAUTION: The electrode is platinum coated. The following can scratch its platinum coating and impair its performance.
- Adjusting the plug gap.
- Using a wire brush to clean the electrode.
- Using a plug cleaner for more than twenty (20) seconds, or at more than 588 kPa (6 kgf/cm2, 85 psi).