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Nitro 640/60 hp Mercury four stroke question...

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  • Nitro 640/60 hp Mercury four stroke question...

    My buddy recently purchased a Nitro 640 lx and has problems getting the boat on plane. The boat has a Mercury four stroke 60hp engine. Initially, when giving it full throttle, the overheating alarm would go off. He took it in to get serviced and had the thermostat replaced. The very next time he went out, the boat would get on plane initially, but as the day progressed, it would do the norm of not putting out enough horsepower to get on plane. After moving at idle speed back to the marina, he purchased and installed a new Interstate cranking battery and the boat ran on plane as it was supposed to. Unfortunately, the very next time out it went back to sub-par performing again. Now he decides that it could possibly be a fuel problem, so he drains the tank and tops it off with premium unleaded. No kidding, the very next time he takes it out again, it will not put out enough horsepower to get on plane, and he is COMPLETELY frustrated at this point. Is there anyone that can give any suggestions that might help my buddy out before he goes broke and insane? My recommendation to him has always been to take it in to get it checked thoroughly, but he is kinda on the stubborn side. Please advise... Any and all suggestions are greatly appreciated.... Thanks..
    Nitro 901 CDX w/Mercury 200 EFI dual 8' Power Poles
    TFO Rods Pro Staff
    TRC Covers Pro Staff
    Zeko Shoes Pro Staff

  • #2
    Replace the coil or at least have it checked
    cheers,
    Steve

    2011/2013 St Jude's Charity Tournament Champion
    Bass East Big Bass Challenge winner of 11-12 and 12-1 hours.

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    • #3
      Water pump too. I was getting alarms and so forth too on my XR6 and did several things like your buddy. Even though I was getting a good stream, I changed out the water pump and problem solved. I've never had a HP problem, a getting on plane problem or alarm since.
      Wishin' I was fishin'...
      www.lds.org

      https://www.instagram.com/lundeerik/

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      • #4
        tell him to take it to Chip at Harbin Marine. he is the Merc-meister
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        • #5
          it is either the stator, ECU or the switch box. your best bet is a mechanic they will hook the computer up and it will tell you exactly what the problem is
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          We are told that we shouldn't judge all Muslims by the actions of an extreme few. Why can't we offer millions of law-abiding American gun owners the same consideration?

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