1975 Models
- Connect tachometer and timing light to leading spark plug wire. Disconnect water temperature switch and connect a jumper wire to both connector terminals. See Fig 1. Start engine and set engine speed at 2000 RPM with choke knob.
- Observe timing marks on shaft pulley. Timing indicator should point between Yellow (leading) and Red (trailing) ignition timing marks. Engine speed should increase by several hundred RPM 104-156 seconds (96-148 seconds on pickup) after engine is started.
Courtesy of MAZDA MOTORS CORP.