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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Ignition Timing: Description and Operation

The base timing is preset when the engine is manufactured. The timing cannot be adjusted. The timing is controlled by the ignition control and knock sensor systems through the Powertrain Control Module (PCM). The knock sensor system retards the spark advance when detonation occurs.