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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Broken, Cracked or Chipped Insulator

Chipped Electrode Insulator:

NOTE: Replace any spark plugs which have cracked broken or chipped insulators.

Symptoms: Insulator chipped or broken.

Possible Causes:
- Usually results from bending the center electrode while adjusting the spark plug electrode gap.
- Severe detonation also can separate the insulator from the center electrode.
- Sudden Rise In Tip Temperature.
- Severe Operating Conditions.
- Improper Gapping Of Plugs.