Leading Ignition Operation
- Warm engine to normal operating temperature. Stop engine and connect tachometer and timing light (at leading spark plug wire on front rotor housing).
- On Federal models only, disconnect No. 2 water temperature coupler (located on top radiator tank) and connect jumper wire between both terminals of wiring harness. On Federal Man. Trans. models only, disconnect altitude compensator switch coupler and connect jumper wire between both terminals of wiring harness.
- On all models, start engine and ensure timing light flashes at any engine speed. Stop engine. Disconnect No. 1 water temperature switch coupler and connect jumper wire between both terminals of wiring harness.
Courtesy of MAZDA MOTORS CORP.
- Start engine and set engine speed to 2000 RPM, using choke knob. Observe timing marks on eccentric shaft pulley. Timing indicator should point between leading and trailing ignition timing marks.
- Increase engine speed with throttle. Check that leading timing mark (yellow) advances and portion "3" aligns with timing indicator when engine speed exceeds 4200-5000 RPM.
- After 1 1/2-2 minutes after pulling choke knob out, portion "1" should advance quickly and be replaced by portion "3".
Courtesy of MAZDA MOTORS CORP.