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  1. #1
    Member
    Join Date
    Jul 2013
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    Brighton , Mi.
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    34

    1999 stratos 285 150 evinrude jackplate question

    I just added a 5.5 cmc jackplate to my 99 285 stratos , I set it to 3.50 below pad , holeshot seems ok but when I trim up about halfway the boat seems to be plowing and spraying at about halfpoint of the boat , speed is about 50@5000rpm . when I trim it up to full trim the boat rides on plane about where it should be, and picks up a little speed/rpm to around 53@5500 rpm . but throws a way high rooster tail about 3 feet over the cowling .

    Before the jackplate I was running 50mph@5000rpm at around 4 3/4 below pad . I am running a 23p ss speedzone prop and the motor seems to be running properly . there are usually two people on the boat with a lite gear load .

    My question is should I lower or raise the motor to get more top end and cut down on the rooster tail ? I know I am wasting power here somewhere but when I trim the rooster down the boat plows and slows and 53 seems a little on the slow side to me ? any suggestions ? thanks in advance .

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  3. Member
    Join Date
    Jan 2005
    Location
    hagerstown md
    Posts
    4,619
    #2
    Let your motor down 1/4" and try it again. You want the roostertail at cowl height. I'd try to find a 24" or a 22" raker to run because that prop has a lot of slip and you need to keep the nose up on that boat.

  4. Member
    Join Date
    Nov 2009
    Location
    Buchanan,Tn
    Posts
    376
    #3
    Agree over trimmed and lower about 1/4 in, to as much as 1/2
    Deeper slip should be less also think 22 raker
    Last edited by lilmule; 09-02-2013 at 07:20 AM.

  5. Member JJolley's Avatar
    Join Date
    Jan 2013
    Location
    Winter Garden
    Posts
    372
    #4
    When I installed my hydraulic CMC I set the prop to pad at 3" below pad at mid stroke. This actually seemed to be the perfect height as an all around setup for my Triton.

    I can raise the motor about another 1" to 1-1/2" before it starts to loose water pressure, here in the Florida heat and humidity that will get me a little better than 61mph with just me in the boat normal tourney load and 1/2 tank of fuel.

    I also have the ability to lower from center in rough water, it really helps the ride and control of the boat by letting me raise the bow a little but still have plenty of bite from the prop which is a 23p Tempest Plus.
    2001 TX 186
    Mercury 150 Saltwater series
    23P Tempest Plus
    CMC PL-65 JackPlate
    "Can't" means "don't want to"

  6. Moderator ep72's Avatar
    Join Date
    Jul 2007
    Location
    TN
    Posts
    15,716
    #5
    Lower the motor to 4.25" below pad and fond a good original Raker.
    Stroker 21
    Mercury 250 PRO XB

    TN Bluewater dealer/rep.
    BBO

  7. Pat Goff
    Join Date
    Jun 2004
    Location
    Smithwick/Seadrift TX
    Posts
    8,894
    #6
    Yeah dude, that prop ain't going to get it done at all.
    Pat Goff

    Two degrees from center
    of nowhere.
    Smithwick TX.

    [IMG][/IMG]

  8. Member
    Join Date
    Jul 2013
    Location
    Brighton , Mi.
    Posts
    34
    #7
    ok , new numbers . I went ahead and bought an original 22p raker prop and I lowered the motor a 1/4 inch . I am now at 3 3/4 below pad . The new prop ran 58@5400 rpm . I gained 5mph so far . rooster was way lower this time at 1/2 trim and the boat rode on pad really well , holeshot was great and steering good . water pressure was about 20 . however at 58mph the boat started to chine just a little bit which it has never done before . I was really hoping for 60 mph with this boat and I really wish I had a new 175 horse motor at this point . should I make another motor height adjustment ? up or down ? I think my rpms now are about it for this 150 ficht . thanks for the help !
    Last edited by Hunter1; 09-16-2013 at 06:56 AM.

  9. Member Silkstringz's Avatar
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    May 2012
    Location
    Arkansas
    Posts
    655
    #8
    bump it up 1/4 at a time until you loose pressure and or speed. You should be able to turn that 22p well over 5400. Im guessing you're a tad low.
    Listen, smile and agree.....then do what you want.