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)

Or, hide this message: temporarily or permanently

Basic Timing Advance Test


1. Connect a suitable tachometer and adjustable timing light to engine.
2. Connect a jumper wire from carburetor switch to ground.
3. Set parking brake and start vehicle, then using the timing light adjustment feature, adjust timing light so specified timing mark is lined up with pointer.
4. The adjustable timing light meter should show amount of advance as shown in "Electronic Spark Control Specification Chart."