1972 Evinrude StarFlire 125 HP Outboards Service Manual, PN 4822, Page 103Get this manual
SHIFT CIRCUIT CONDITION REASON
1Cannot start engine
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Selector switch defective in neutral Shift selector switch Shift and blocking diodes open Engineinstrument wiring, wires broken or disconnected Burr or worn splines on propeller shaft Oil pump worn Low oil level Wave washer missing or not seatedNeutral solenoid inoperative or out of adjustmentPropeller shaft spring broken Burr on spline of propeller shaft Solenoids damaged Solenoids out of adjustment Clutch dog damaged Oil pump worn Incorrect oil or low oil level (water in oil) Shift selector switch Foreign materials in gear housing Reversed or broken wires on selector switch or in wiring harness Wave washer not seated properly Shift diodes