Hi, I have 65 hp 1972 evinrude outboard motor, it has ran great and always starts right away, it abrutly stopped running and will not start the motor turns over when i turn the ignition but ive tested the spark on all 3 cylinders and theres none, however it did briefly spark once when i was showing my father the problem but only once maybe then no more. Ive brought the boat to my normal boat mechanic and hes baffled by it, If anyone has any ideas please help. Thanks DD