Operation CHARM: Car repair manuals for everyone.
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: Adjustments

BASE TIMING
The base ignition timing is determined by the relationship of the crankshaft position sensor to the crankshaft reluctor ring. This relationship is not adjustable and results in the base ignition timing of 10° BTDC.