I had a similar problem on my 3.0 on my old boat.....not sure if yours is set up the same but the tach gets it signal off the coil, I had a short in the tach that was killing the spark. After replacing the distributor, points, plugs, plug wires and coil I finally disconnected the wire from the tach to the coil and it fired right up.
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1986 V-20
1986 Yamaha 150 HP
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