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  1. #1
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    921 with SHO prop suggestions

    I have a 921 with a 250 SHO, currently I am running a 25 Fury Prop.
    The Prop to pad is appx. 3.5-3.75 inches. 10" manual jack plate.
    I am running about 70-70.8mph at 5600-5650rpms with small tackle load and about 40-45 gallons of fuel. Is this an acceptable speed or do you guys think I should be running faster. Do I need to change props. Any suggestions are appreciated.
    Last edited by hunter689; 01-06-2014 at 10:06 AM.

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  3. Member
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    Feb 2011
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    #2
    Based on my test ride of the 921 you are about right, 70 mph is what I saw the whole time. I couldn't get one any faster. YThe guys on here running them 73/74/75 have me scratching my head, I have yet to get in one that was that fast. That was one of the main reasons I went with the 920. There was a 3/4 MPH diff...

  4. Member
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    Mar 2005
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    #3
    Prop selection is usually a trial and error process. I almost think that you would do better with a larger diameter prop with a 25 pitch and run higher on the jackplate. Good luck.

  5. Member
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    #4
    We ran our 921 SHO at 3" below pad with stock 27" Yamaha prop at 74-75 MPH full tourney loads at sea level.

    Russ
    Limit Out Marine

  6. Moderator Hickory Legend's Avatar
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    #5
    Talked to to guy on old hickory this spring, his was running 70 on a 921 with a Merc 250 XS.
    sounds like your in the all park!!

    Hickory Legend

  7. Member
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    #6
    Summer speeds it sounds about right. As cool as it is getting now, I would think you should be in the 74+ range. Have you tried the T1 with that motor? would be my guess.

  8. Member
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    #7
    I haven't tried the T1 yet but I am thinking about giving it a try. Just can't justify the $700 trial just yet.

    I also looked at my prop earlier and its a 25 pitch instead of 26 so that could be my issue.

  9. Member
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    #8
    25 pitch T1 is the right prop
    "Luminous beings are we not this crude matter." Yoda

  10. Member
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    Alexander,Ar
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    #9
    Quote Originally Posted by limitout View Post
    We ran our 921 SHO at 3" below pad with stock 27" Yamaha prop at 74-75 MPH full tourney loads at sea level.

    Russ
    Limit Out Marine
    Do you recommend running a 27p on a 921? Everyone I'm talking with suggest the 25T1. I ran the boat again this weekend and at 5600rpms I was going 70.8 which is the best I have seen.
    Does anyone have a T1 prop they would be willing to loan me for a trial run before I break down and spend $700?

  11. Member
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    Mar 2008
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    Linden, NC
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    #10
    I have a FX20 with the 250 sho and run the 27T1 and turn it 5750rpms at 75.5, the FX is a heavier boat so you should be able to turn the 27T1 with no prob.
    James Clark.. SKEETER...FX20..250 SHO Yamaha, Izorline Pro Staff, Deep Creek Pro Staff,Cpt. Gary Marine Products, Powers Swain Fishing Team, Warriors on the Water Staff

  12. Member
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    Apr 2012
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    #11
    25T1 Prop at sea level is what we are finding the best. The Fury is the wrong prop for the SHO imho. We had run the 27 as I had mentioned previously but have found the 25T1 Ventless to be the best and are getting 75-76 every time we run.

    What elevation are you running?

  13. Member
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    #12
    Quote Originally Posted by limitout View Post
    25T1 Prop at sea level is what we are finding the best. The Fury is the wrong prop for the SHO imho. We had run the 27 as I had mentioned previously but have found the 25T1 Ventless to be the best and are getting 75-76 every time we run.

    What elevation are you running?

    I finally got a new 25T1 prop and was able to run it this past week. My RPMS went up to 5950-6000 but my speed actually went down (68-69). Also now I am having to trim the motor all the way up to reach those speeds. I raised the jack plate all the way up to max height. Will run tomorrow to see if the speeds get any better by raising it up.

    What hole mount on the motor do you place yours on the jackplate?

  14. Member
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    #13
    We are seeing between 2-3/4"- 3" below pad and 26-27" pitch props running 75 two guys and tournament load.

    Russ

  15. Member
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    #14
    It's set at 2 5/8 right now. I'm just confused as to why the speed went down if the rpms went up, unless there is to much slip.

    Russ, I thought you were seeing74-76 out of the 25p also?

  16. Member
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    #15
    You need to start easing down with the motor till the speed picks up.
    "Luminous beings are we not this crude matter." Yoda

  17. Member
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    #16
    [QUOTE=nightbasser;4319230]You need to start easing down with the motor till the speed picks up.[/QUOTE

    Do you mean lowering the Jack plate down or lower the trim while moving?


    I was able to run it today at 5900-5950 rpm and still no difference than from when the prop to pad was 3 1/2.

    Any suggestions?

  18. Member
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    Pacific,WA
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    #17
    Hunter,

    Yes 25p as well 74-76. May depend on elevation, load, etc. The first prop we tried was the 25 in Seattle area on lake Washington. 25 seems to have best hole shot.

  19. Member EdDavisKY's Avatar
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    #18
    [QUOTE=hunter689;4320239]
    Quote Originally Posted by nightbasser View Post
    You need to start easing down with the motor till the speed picks up.[/QUOTE

    Do you mean lowering the Jack plate down or lower the trim while moving?


    I was able to run it today at 5900-5950 rpm and still no difference than from when the prop to pad was 3 1/2.

    Any suggestions?
    '

    Try not using so much trim to start with Phoenix's don't need as much as other brand rigs. I"m running a SHO on a 721 with a 27T1 but have the Atlas Hydraulic JP. If using less trim does not do the trick then would Suggest setting your motor to 3" below pad and go from their. Remember Limitout is running @ sea level and would gather you living in Ar could be higher which would make you have to run your motor at a lower setting.
    <a href=http://s112.photobucket.com/user/TritonKy/media/Steez100SHA004-1.jpg.html target=_blank><img src=http://i112.photobucket.com/albums/n161/TritonKy/Steez100SHA004-1.jpg border=0 alt= /></a>[/URL].

    Endeavouring to persevere
    USMC 1967-1970 - Purple Heart

  20. Member
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    #19
    Thanks for all the help and suggestions. I'm going to run it some more this week and adjust the settings.

    Do you guys think I'm running the wrong pitch since its staying at the 6000 rpm mark?

  21. Member EdDavisKY's Avatar
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    #20
    Experiment some more with the 25P as well as adjusting your JP if no results would say try and get your hands on a T26P. See if you can borrow one from your dealer to try out first.....my guess you are probably going to have to go up a pitch on your prop. Also would be nice to know what the elevation of the lake you are running on as that will affect performance on SHO's. Keep us informed as someone will be able to help you get it dialed in.
    <a href=http://s112.photobucket.com/user/TritonKy/media/Steez100SHA004-1.jpg.html target=_blank><img src=http://i112.photobucket.com/albums/n161/TritonKy/Steez100SHA004-1.jpg border=0 alt= /></a>[/URL].

    Endeavouring to persevere
    USMC 1967-1970 - Purple Heart

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