IH: Engine Control - Sub-01F

Revised timing marks starting with 1980 models

  • The timing marks have been revised on all 1980 and later 1000cc (crankcase number 780-108-001 and up) and 1340cc models to enable the timing to be set electronically at the factory. This step will reduce the number of timing adjustments required during pre-delivery and set-up. The procedure used to set the timing is exactly the same.
  • Only the timing marks have changed. The front cylinder advance timing mark has changed from a straight line to a 1/8“ dot and the rear cylinder advanced timing mark now represented by a lazy eight.
  • Revised timing marks:
    • A straight line for the front cylinder (top dead center).
    • An 1/8” drilled dot for the front cylinder (full advance).
    • A lazy eight for the rear cylinder (full advance).


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