I have a 90hp late 80s 3cyl Carby Mercury. When the engine is running I hear a tapping noise from the motor similar to a car engine that needs tappet adjustments. Another similar sound i can compare it to is the the noise of early type fuel injection systems on cars? The motor runs perfectly but this noise is quite loud and does not sound right. Is this a normal sound? If so what is it? If not normal any suggestions as to what it could be?
