Manual spark advance harley

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SA – Spark Advance Mode. This mode shifts the advance table up or down within the range of –9 to +6 degrees, in whole-degree increments, to. Ignition system . - a . Both the Harley - Davidson and Indian shaft - driven models have an automatic spark advance which eliminates the manual sparkTM 10-1175—Maintenance manual, motorcycle, solo, Harley-. Davidson (Modei42-WLA), 11 September Fully advance spark lever (push inward toward engine) and. As the piston begins moving faster, ignition must advance further down the compression stroke to ensure adequate time for combustion lag and flame travel.