I have a Mercury 115 6 cylinder motor on my Checkmate. I have look at several website and tried to locate a serial number on the motor. Their is no "tag or plate" with anything resembeling a serial number. By cross checking different parts, fuel pump, carberators etc. I have been able to zero in on mid to late 80's. Is their any other way of accurately identifing my motor? Have a bad stator it seems but replacement selection varies according to the year. It has an open circuit on the blue wire.