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Home >> Triumph >> 1978 >> Spitfire >> Repair and Diagnosis >> Engine Performance >> Tune-Up >> Tune-Up Procedures - 4-Cylinder >> Ignition Timing

Ignition Timing

Warm engine to normal operating temperature. Check or adjust ignition timing with idle speed at specification and distributor vacuum hose disconnected and plugged. If necessary, loosen distributor hold-down clamp and rotate distributor.

IGNITION TIMING SPECIFICATIONS

Application RPM Timing
1974-76 Models 800-850 2°ATDC
1977-79 Models
  Federal 700-900 (1) 10°BTDC
  Calif. 700-900 2°ATDC
(1) With distributor vacuum hose disconnected and plugged.
Fig 1: Idle Speed, Mixture & Decel Valve Adjusting Screws
G09326560Courtesy of NOT AVAILABLE