50hp johnson vro

Discussion in 'Powerboats' started by Bradlyp, Apr 12, 2021.

  1. Bradlyp
    Joined: Apr 2021
    Posts: 3
    Likes: 0, Points: 1
    Location: Denton nc

    Bradlyp New Member

    Hey I have a 2001 50hp johnson vro that won't get past about 2500rpms it seems to be In some sort of limp mode I've cleaned the carbs fuel filter and water pump is fairly new with good stream at idle and increased with rpms im thinking it could be the coils, or temp sensor any advice would be completely appreciated?
     
  2. Mr Efficiency
    Joined: Oct 2010
    Posts: 9,624
    Likes: 832, Points: 113, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    You should get hold of a workshop manual, if the fuel passages are all clear, it might be a fuel pump problem, but if you have someone squeezing the primer bulb when you gun it, and it still doesn't run properly, that would be excluded.
     
  3. Bradlyp
    Joined: Apr 2021
    Posts: 3
    Likes: 0, Points: 1
    Location: Denton nc

    Bradlyp New Member

    I had my son pumping the bubble constantly, a few times while trying to build speed and it didn't change the tone its like its hitting a rev limit but at a low rpm I don't have a tachometer so I'm not sure the rpm
     
  4. Mr Efficiency
    Joined: Oct 2010
    Posts: 9,624
    Likes: 832, Points: 113, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    Might be dropping a cylinder out, you need a manual and follow troubleshooting procedures
     
  5. gonzo
    Joined: Aug 2002
    Posts: 15,143
    Likes: 909, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    Is it showing an overheat error?
     
  6. Mr Efficiency
    Joined: Oct 2010
    Posts: 9,624
    Likes: 832, Points: 113, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    I doubt it would have the "Slow" function that limits rpm when overheating in one of those motors, might be wrong. It certainly existed well before 2001` in bigger engines in the OMC range, but not sure about 50's. In any event, the manual will cover such contingencies.
     

  7. Bradlyp
    Joined: Apr 2021
    Posts: 3
    Likes: 0, Points: 1
    Location: Denton nc

    Bradlyp New Member

    No there are no alarms or any indication of an error
     
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