Results 1 to 14 of 14
  1. 08-23-2019, 09:38 AM #1
    M-D
    M-D is offline
    Member
    Join Date
    May 2012
    Location
    Indianapolis, Indiana
    Posts
    865

    200HP OX66 Water Pressure Numbers

    2003-2004 years, new to me boat / motor. Existing WP gauge is dead and I have a new one on the way.
    What psi numbers should I be seeing at idle and WOT and anywhere in between?
    I tried searching but didn't see the info.
    2004 Ranger 519VX
    Yamaha VMAX 200HP OX66
    Reply With Quote Reply With Quote
  2. skeeterBill200
    skeeterBill200 is offline
    Member
    Join Date
    Jan 2019
    Location
    Houma La.
    Posts
    97
    #2 08-23-2019, 10:23 AM
    I have an 04 200 OX66 it shows about 4lbs on idle and 28lbs WOT
    Reply With Quote Reply With Quote
  3. yam911
    yam911 is offline
    Member
    Join Date
    Feb 2018
    Posts
    3,190
    #3 08-23-2019, 02:46 PM
    Yamaha specification is for 11 psi or more at wide open throttle.
    Reply With Quote Reply With Quote
  4. M-D
    M-D is offline
    Member
    Join Date
    May 2012
    Location
    Indianapolis, Indiana
    Posts
    865
    #4 08-23-2019, 03:20 PM
    Thanks guys!!
    2004 Ranger 519VX
    Yamaha VMAX 200HP OX66
    Reply With Quote Reply With Quote
  5. 1bluemcm
    1bluemcm is offline
    Member
    Join Date
    Jul 2014
    Location
    Chesterfield VA
    Posts
    3,402
    #5 08-24-2019, 08:06 PM
    The reading may be partly due to the gauge. I switch from one gauge manufacturer to another, and am seeing a lower reading that with the previous gauge. I have no clue which one was/is more accurate now. Just another thing to keep in mind, the gauge itself could have an impact on the reading.
    Kevin | 2000 Champion 19​1 | 2000 Yamaha OX66 200hp
    Reply With Quote Reply With Quote
  6. M-D
    M-D is offline
    Member
    Join Date
    May 2012
    Location
    Indianapolis, Indiana
    Posts
    865
    #6 08-25-2019, 05:22 AM
    Quote Originally Posted by 1bluemcm View Post
    The reading may be partly due to the gauge. I switch from one gauge manufacturer to another, and am seeing a lower reading that with the previous gauge. I have no clue which one was/is more accurate now. Just another thing to keep in mind, the gauge itself could have an impact on the reading.
    Good point! Not all gauges are created equal.
    2004 Ranger 519VX
    Yamaha VMAX 200HP OX66
    Reply With Quote Reply With Quote
  7. 98skeeter202
    98skeeter202 is offline
    Member
    Join Date
    Aug 2012
    Location
    pickles gap ar
    Posts
    2,591
    #7 08-25-2019, 08:50 PM
    Never had any pressure at ilde, 12-16 on upper rpm.
    Reply With Quote Reply With Quote
  8. JoeFriday
    JoeFriday is offline
    Member
    Join Date
    Sep 2014
    Location
    Dallas, TX
    Posts
    1,104
    #8 08-25-2019, 11:33 PM
    5-25 depending on rpm.
    Reply With Quote Reply With Quote
  9. joexiong
    joexiong is offline
    Member
    Join Date
    Jul 2019
    Location
    Brooklyn Park, MN
    Posts
    108
    #9 08-26-2019, 01:59 PM
    5 @ idle. 25+ at WOT.
    50th Anniversary
    1998 Skeeter Zx195C
    200 V MAX
    Reply With Quote Reply With Quote
  10. Menacer
    Menacer is offline
    Member
    Join Date
    Apr 2019
    Location
    Hamilton, NJ
    Posts
    545
    #10 08-26-2019, 03:27 PM
    I have a 2005 at idle usually no pressure although recently it will climb at time untill i pop the gas a touch. WOT 10-20.
    2006 Stratos 294 Pro XL.2005 Yamaha 200 VMAX 3.1L. 8" Hydro Dynamics Rapid Jack. Ultrex 112 I-Plot link. 2 Helix 10 Chirp Mega SI GPS G2N.
    Reply With Quote Reply With Quote
  11. JoeFriday
    JoeFriday is offline
    Member
    Join Date
    Sep 2014
    Location
    Dallas, TX
    Posts
    1,104
    #11 09-05-2019, 10:00 PM
    For the guys with 0 pressure at idle, I had the same thing until I changed out the pump housing. I don’t know if the old one was warped or there was a redesign, but after I changed that, I got much better pressure.
    Reply With Quote Reply With Quote
  12. M-D
    M-D is offline
    Member
    Join Date
    May 2012
    Location
    Indianapolis, Indiana
    Posts
    865
    #12 09-06-2019, 06:33 AM
    Got it out this past weekend. New water pressure gauge, 0 psi at idle but as soon as I give it any throttle, it jumps up. Saw 10-20 psi when running.
    2004 Ranger 519VX
    Yamaha VMAX 200HP OX66
    Reply With Quote Reply With Quote
  13. joexiong
    joexiong is offline
    Member
    Join Date
    Jul 2019
    Location
    Brooklyn Park, MN
    Posts
    108
    #13 09-06-2019, 10:42 AM
    Quote Originally Posted by M-D View Post
    Got it out this past weekend. New water pressure gauge, 0 psi at idle but as soon as I give it any throttle, it jumps up. Saw 10-20 psi when running.
    50th Anniversary
    1998 Skeeter Zx195C
    200 V MAX
    Reply With Quote Reply With Quote
  14. Triton420
    Triton420 is offline
    Member
    Join Date
    Aug 2016
    Location
    Mount Dora FL
    Posts
    381
    #14 09-15-2019, 02:03 PM
    mine never showed pressure at idle until I replaced the poppet valve and replaced the T-stats that had minor debris in them.
    2002 Tr-19 200 ox66
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »