Engine ignition timing tool

An auxiliary engine ignition timing display tool for use with a strobe timing light in setting the ignition timing of a Harley Davidson™-type motorcycle engine, the engine having an indicator ignition timing viewable on a timing indicator side of the engine and an engine ignition timing setting adjustment device accessible on a timing adjustment side of the engine, the timing adjustment side of the engine being opposite the timing indicator side of the engine;

• the engine also including a rotatable cam assembly, a gear cover and an ignition unit, the timing display tool packaged for sale as a kit and comprising, in combination:
• (a) a rotatable pointer indicator unit having a pointer indicator at a proximal end and attachment means at a distal end for releasable attachment to the cam assembly;
• (c) an ignition timing measuring plate which when installed is on the timing adjustment side of the engine, said measuring plate having a plurality of ignition timing marks for indicating spark advance or retard relative to a top dead center position;
• (d) measuring plate fasteners for releasably fastening the measuring plate to the engine and positioning the measuring plate proximal to the pointer indicator unit;
• whereby the measuring plate and pointer indicator unit in conjunction with the strobe timing light set at the spark firing frequency of the engine are operable to provide an indication of the ignition timing of the engine while the engine is running.

An auxiliary engine ignition timing display tool for use with a strobe timing light in setting the ignition timing of a Harley Davidson™-type motorcycle engine having an indicator of ignition timing viewable on a timing indicator side of the engine and an engine ignition timing setting adjustment device accessible on a timing adjustment side of the engine, the timing adjustment side of the engine being opposite the timing indicator side of the engine;

• the engine also having a gear cover, a housing and a spark plug ignition unit responsive to relative piston position with respect to a top dead center position, the timing display tool packaged for sale as a kit and comprising in combination:
• (a) a spark timing display device, removably attachable to the gear cover, which when installed is operatively coupled to the ignition unit for indicating the degree of spark advance or retard relative to top dead center and provides a display of the indication viewable on the timing adjustment side of the engine, said display device being removably attachable to the engine housing;
• and
• (b) a plurality of fasteners for releasably fastening the display device to the gear cover and positioning the display device in a preselected position suitable for coupling of the display device to the ignition unit;
• whereby the display device in conjunction with the strobe timing light set at the spark firing frequency of the engine are operable to provide an indication of the ignition timing of the engine while the engine is running.