1991 mercury XR4 150 hp

by Gerry
(Eastern South Dakota)

Was running on the water at 45 MPH boat all of a sudden lost power and will not run over 1600 rpm. I have changed fuel pump and also trigger and stator and switch boxes. It still acts like it is missing. 110 pounds of compression on all cylinders. Still max rpm 1600 if I push throttle down more it dies.

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