mercury 150hp four stroke 2015

by micah
(manchester, NH. usa)

Im in the northeast, just bought a boat with a 2015 mercury 4 stroke 150hp motor when I put the water muffs on it in my driveway it starts, idles a little rough, but really cuts out at just under 3000 RPMs. shakes and cuts our will not go above 3000RPM's. I have checked and have spark on all 4 wires, I also just replaced the spark plugs. Would love to get this boat on the water if I can figure this issue out. shaps are all backed up 3-4 weeks based on covid and busy time of year.

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Nov 25, 2020
by: Anonymous

Try it in water, often when you try it out of the water on muffs, the water flow is not enough, did you get a high temp alarm.

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