Ignition Timing

Check or adjust ignition timing with engine at normal operating temperature and point air gap set to specifications. Disconnect and plug distributor vacuum hose (if applicable). Rotate distributor housing to achieve correct timing. Tighten distributor lock nut and reconnect vacuum hose.

1974 IGNITION TIMING SPECIFICATIONS

Application

RPM

Timing ⁽¹⁾

Midget

1500

9°BTDC

MGB & GT

850

11°BTDC

⁽¹⁾	With distributor vacuum hose disconnected and plugged.

1975-76 IGNITION TIMING SPECIFICATIONS

Application		RPM	Timing
Midget		800	2°ATDC
MGB
	With Catalytic Converter	1500	13°BTDC
	W/O Catalytic Converter	1500	10°BTDC

1977 IGNITION TIMING SPECIFICATIONS

Application		RPM	Timing
Midget
	Federal	800	10°BTDC
	Calif	800	2°ATDC
MGB
	Federal	1500	10°BTDC
	Calif.	1500	10°BTDC
	Canada	1500	13°BTDC

1978-79 IGNITION TIMING SPECIFICATIONS

Application

RPM

Timing

Midget

Federal

800

⁽¹⁾10°BTDC

Calif.

800

⁽¹⁾2°ATDC

MGB

1500

10°BTDC

⁽¹⁾	With distributor vacuum hose disconnected and plugged.

Fig 1: Typical MGB Ignition Timing Marks

Courtesy of NOT AVAILABLE

Fig 2: Typical Midget Ignition Timing Marks

Courtesy of NOT AVAILABLE