Engine ignition timing device

The present invention relates generally to an ignition timing device. More particularly, the present invention relates to an ignition timing device for use on Harley-Davidson™ engines. An ignition timing device for timing an engine having a timing port and a timing mark indicative of a position of a movable member. The ignition timing device includes a sensor adapted to be secured in the timing port to provide a timing mark signal indicative of presence of the timing mark. Also, an ignition sensor is adapted to provide an ignition signal indicative of the occurrence of an ignition spark. A filter receives the ignition signal and provides a filtered ignition signal. The filter filters ignition sparks of compression strokes from ignition sparks of compression and exhaust strokes of a selected cylinder to provide the filtered ignition signal. Also, the delay element is provided that receives the filtered ignition signal and provides a delayed signal having a selected delay from the filtered ignition signal. A comparator receives the timing mark signal and the delayed signal. The comparator provides an output signal indicative of substantial simultaneous occurrence of the timing mark signal and the delayed signal. Also, an indicator receives the output signal and operates as a function thereof.