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2003 Nitro 1900 With Jack Plate -- Setting Motor Height

Thread in 'Motors & Props' started by wyecrabber, Sep 1, 2018.

  1. wyecrabber

    wyecrabber New Member

    Likes Received:
    Aug 16, 2018
    Recently purchased 2003 Nitro 1900 tunnel hull with a Mercury 90 hp 4 stroke mounted on a 6" jackplate -- according to previous owner boat has always had issues getting on plane. Current prop is 13x19, three blade. Engine at 4000 rpm (~20mph) will get boat on plane -- take a long time. The motor is all the down on the jackplate which I feel is too low. What's a good starting point for adjusting the motor height, 4" below the tunnel on the lowest point on the hull? Thinking of going to a 4 blade, 13.4x15, but want to work through the jack plate height first.


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