Ignition Calibration

The ignition calibration page is used to match the displayed timing to a timing light. Timing disparity between the displayed timing of the ICM and a timing light can be due to TDC index trigger bolt being installed not precisely at TDC or similar sensor offsets. Note that the ‘Current Timing Displayed’ value will not change as the offset is adjusted, instead the value read on the timing light will change. Once the timing light matches the current timing, the signal is calibrated.

When doing an initial calibration of the engine, it can be useful to set RPM advance to be constant so that the timing does not move around while calibrating- for example, set the timing to 20 degrees fixed.

Using at timing light, increase or decrease the offset on this page until the light matches the displayed value on the top of the page.

If the trigger was installed BTDC, the offset will be negative. If the trigger was installed ATDC, the offset will be positive.

This step is normally done only once after install.