Page 1 of 4 1 2 3 ... LastLast
Results 1 to 10 of 35
  1. #1
    Kelly_A's Avatar
    Join Date
    Dec 2009
    Location
    Central Oklahoma
    Posts
    660
    +1
    17

    Questions about Riva adjustable nozzle and Riva rideplate for FZ

    Currently running a unmodified VX plate shimmed .06 front and rear. I'm willing to give up a little speed to decrease the porpoising I'm experiencing at WOT. At 82, the porpoising is so bad w/ trim neutral that I'm actually afraid to open it up in all but the smoothest water.

    Has anyone switched from the VX plate to the Riva plate? Wondering how much speed loss I'll get and how the Riva plate performs in the low 80mph range.

    Also, the Riva adjustable nozzle includes three reduction rings, 81, 82 & 83mm. I'm assuming the 82mm most closely approximates the stock FZ nozzle? What's approximate RPM drop per mm of decreased ring diameter?

    Thanks for the help,
    Kelly


  2. #2
    My buddy is geting rid of the Riva ride-plate becasue it wont stay hooked up in the water. I recomend the R&D Ride-plate. Im currently in the stages of trying a works ride plate. I raced closed corse, and hear good things, but the long of the short, is the R&D stays hooked up, and you might gain more speed...

  3. #3
    you can also PM STANGBANG. He has personal experence with the Riva Ride plate. He could guide you in the right direction

  4. #4
    Kelly_A's Avatar
    Join Date
    Dec 2009
    Location
    Central Oklahoma
    Posts
    660
    +1
    17
    Thanks Coby, I appreciate the info.

  5. #5
    Site Admin Green Hulk's Avatar
    Join Date
    Apr 2005
    Location
    Morgan City, LA
    Posts
    36,398
    +1
    2,524
    Quote Originally Posted by Kelly_A View Post
    Currently running a unmodified VX plate shimmed .06 front and rear.

    Kelly, try removing the shims from the front of the plate and putting .030 shims at the back of the plate. This should prevent the porpoise.

    Quote Originally Posted by Kelly_A View Post
    I'm assuming the 82mm most closely approximates the stock FZ nozzle? What's approximate RPM drop per mm of decreased ring diameter?

    Thanks for the help,
    Kelly
    Stock nozzle is 83mm. Each 1mm is 80 to 100 RPM

  6. #6
    Kelly_A's Avatar
    Join Date
    Dec 2009
    Location
    Central Oklahoma
    Posts
    660
    +1
    17
    Thanks, I'll give that a shot - eventually...

    I believe I blew my motor yesterday, rod went through the block, I'm guessing.

    There's water in the oil and oil in the hull. Not sure the extent of the damage until I get the motor out. Sort of devastated and numb at the same time - I'd just gotten it dialed in and running great. Looks like a long and expensive rebuild in the works.

  7. #7
    Banned User
    Join Date
    May 2006
    Posts
    1,329
    +1
    152
    That really sucks, what mods do you have done and how many hrs.

  8. #8
    Addicted Member 5001craig's Avatar
    Join Date
    Jul 2007
    Location
    Northeast Indiana
    Posts
    2,924
    +1
    11
    Quote Originally Posted by Kelly_A View Post
    Thanks, I'll give that a shot - eventually...

    I believe I blew my motor yesterday, rod went through the block, I'm guessing.

    There's water in the oil and oil in the hull. Not sure the extent of the damage until I get the motor out. Sort of devastated and numb at the same time - I'd just gotten it dialed in and running great. Looks like a long and expensive rebuild in the works.
    Definitely need more info!!!

  9. #9
    gmoeller's Avatar
    Join Date
    Nov 2007
    Location
    Hermosa Beach, Calif
    Posts
    1,450
    +1
    9
    Quote Originally Posted by Kelly_A View Post
    Thanks, I'll give that a shot - eventually...

    I believe I blew my motor yesterday, rod went through the block, I'm guessing.

    There's water in the oil and oil in the hull. Not sure the extent of the damage until I get the motor out. Sort of devastated and numb at the same time - I'd just gotten it dialed in and running great. Looks like a long and expensive rebuild in the works.
    WTF?
    Sorry to hear.

  10. #10
    Kelly_A's Avatar
    Join Date
    Dec 2009
    Location
    Central Oklahoma
    Posts
    660
    +1
    17
    I'll tear into it this weekend. Only had 45 hours on the ski. Will post more info when I have it.

    Mods are: Riva air intake, Riva through hull exhaust, Riva waterbox, Riva manifold upgrade, JD IC on dedicated pump line, foam inserts removed, tubes removed, hull ventilation, VX ride plate (shimmed .06 front & back), TMB intake grate (chip removed - foil in least aggressive position), Skat Swirl 13/21 (true) prop, R2 ECU, Powershot, ETech low boost wheel (14.1 @ 8600), Macc sponsons.

    It's not like I was really pushing the edge of the envelope or anything.

Page 1 of 4 1 2 3 ... LastLast

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Question about Riva IC and a boost guage..
    By Carbonic in forum Yamaha PWC Performance (4-stroke)
    Replies: 6
    Last Post: 12-13-2011, 08:20 PM
  2. Question about riva and CP piston standard and oversize
    By otoss in forum 4-Tec Performance
    Replies: 8
    Last Post: 06-09-2011, 08:45 PM
  3. Questions about some RIVA parts for FZS
    By lukygomes in forum Yamaha PWC Performance (4-stroke)
    Replies: 14
    Last Post: 06-28-2010, 08:06 AM
  4. A few more questions about Riva's Stage III
    By RXPED in forum 4-Tec Performance
    Replies: 9
    Last Post: 10-09-2006, 07:57 AM
  5. Question about Riva Results on there stage II Kit? Did they
    By Water4fire in forum 4-Tec Performance
    Replies: 8
    Last Post: 04-10-2006, 12:50 PM

Posting Permissions

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