Results 1 to 7 of 7
  1. #1

    Would a bad water regulator cause low power?

    Bought a 97 gsx 787. PO stated it bogged. Checked compression before I bought it, 150 both cylinders. Before I ever rode it I replaced all fuel lines, fuel selector, fuel filter, rebuilt carbs, set pop off, cleaned raves, etc. I dont think any of these fixed it. Boat seems to have low power throughout the whole rpm range. Got it back home tonight and saw the screw on the clamp for the bellow inside the regulator came off and the bellow was off, water was shooting out of it. Could this cause my problem?


  2. #2
    Waterluvr's Avatar
    Join Date
    Mar 2015
    Location
    Northern Indiana
    Posts
    478
    +1
    70
    The water regulator clamp and bellows are suspect on any 787 at this point of age if they haven't seen new service parts. It will certainly affect rpm transition if it's not adding or restricting water as needed, good chance by now the clamp band has made a hole in the bellows where the screw joins it together.

  3. #3
    This is how I run a jetski shop in the desert nmpeter's Avatar
    Join Date
    May 2008
    Location
    Elephant Butte New Mexico
    Posts
    9,986
    +1
    2,636
    that's exactly right. don't lose the band or the screw, they have a high oem replacement cost.

    I use a spring from a rave valve instead of the wire clip that always puts holes in the bellows.

    what does your pump look like?..poor power thru the entire rpm range may actually be a less then optimal jetpump

  4. #4
    I have a spare water regulator off of a GSX I bought to part out. It looks to be in great shape. I have visually inspected the pump, could use a new wear ring but it doesnt look horrible.

  5. #5
    Waterluvr's Avatar
    Join Date
    Mar 2015
    Location
    Northern Indiana
    Posts
    478
    +1
    70
    Quote Originally Posted by Chucked View Post
    I have a spare water regulator off of a GSX I bought to part out. It looks to be in great shape. I have visually inspected the pump, could use a new wear ring but it doesnt look horrible.
    I keep rebuilt regulators on hand as an everyday service part, I never advocate being a parts changer before due diligence and making a diagnosis for fault but that's one of those parts that might look serviceable and just isn't from a rock hard bellows after 15 years of mineral rich river water exposure ect.

    Swap that over and see what happens, anyone running a 787 with an old regulator should show it some love and rebuilt it before it robs them of a weekend on the water they fail with predictable regularity at this stage of use.

  6. #6
    Where can I buy the parts to rebuild it?

  7. #7
    Waterluvr's Avatar
    Join Date
    Mar 2015
    Location
    Northern Indiana
    Posts
    478
    +1
    70
    Quote Originally Posted by Chucked View Post
    Where can I buy the parts to rebuild it?
    I use WSM parts (primarily bellows) to service them or you can order OEM parts right off the link at the top of the site page here: http://partsfinder.onlinemicrofiche....artsfinder.htm

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. 1999 XLT 1200 D-plate caused low power?
    By galderman0110 in forum Yamaha PWC Performance (2-stroke)
    Replies: 12
    Last Post: 07-26-2011, 10:54 AM
  2. would low volts cause low rpm's ?
    By gtoconv in forum 4-Tec Performance
    Replies: 3
    Last Post: 05-30-2007, 07:23 AM
  3. Water regulators?
    By SeanCucf in forum 2-Stroke Performance
    Replies: 2
    Last Post: 01-24-2007, 11:13 PM
  4. Water ingestion with Riva power filter?
    By Lurker in forum 4-Tec Performance
    Replies: 11
    Last Post: 06-07-2006, 07:09 AM
  5. Rxp cavitating badly, water in hull
    By kenshin89 in forum 4-Tec Performance
    Replies: 5
    Last Post: 05-21-2006, 12:13 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •