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Potential Tachometer Issue 2007 Nitro 189 Sport 150 Optimax

Thread in 'Motors & Props' started by Kswan, May 6, 2019.

  1. Kswan

    Kswan New Member

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    Minnesota
    Hello
    I recently purchased a used 2007 Nitro 189 Sport with a Mercury 150 Optimax.

    I'm seeing about 56mph with 1/2 tank gas and only me in the boat. It has 21p Laser II prop. The issue is my Tachometer is reading 6400+ rpm. I believe the motor has an over rev alarm but have not heard it. The max RPM for the motor is 5750.
    Also I can have it trimmed all the way down and still exceed the 5750 rpm. Runs about 6000 when WOT and trimmed down.

    Is it the Tachometer that's misreading or wrong prop pitch?

    What do other people see for top end on a similar setup?

    Thanks
     
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