Patent ID: 6429658
Filing Date: 2002-08-06
Classification: F02P

Abstract:
A method for timing a Harley Davidson type engine having a timing port through which a timing mark indicative of a position of a movable member of the engine can be seen, the method comprising:securing a variable reluctance sensor proximate the timing port of the Harley Davidson type engine; sensing the presence of the timing mark of the engine with the variable reluctance sensor and providing a timing mark signal as a function thereof; sensing an occurrence of an ignition spark and providing an ignition signal as a function thereof; filtering ignition sparks of compression strokes from ignition sparks of compression and exhaust strokes of a selected cylinder and providing a filtered ignition signal being indicative of only the ignition sparks of compression strokes; generating a delayed signal having a selected delay from the filtered ignition signal; comparing the timing mark signal to the delayed signal and providing an output signal indicative of substantial simultaneous occurrence of the timing mark signal and the delayed signal; and operating an indicator as a function of the output signal.