Ignition Timing: Testing and Inspection

Checking Ignition Timing Control

Requirements:
Ignition timing adjusted to specifications.

1. Centrifugal control (vacuum hose detached).

Ignition timing should be 3 to 5° before TDC at idle speed (900 ± 50 rpm).

At 6000 rpm ignition timing must not exceed 25° before TDC.

2. Vacuum control (vacuum hose connected).

At an engine speed of 4000 rpm ignition timing should be between 28 and 32° before TDC.