Results 1 to 7 of 7
  1. #1

    Since there is RAVE valves....

    hey since there is rave valves does that mean the 800 does NOT need reeds? the rave is a form of rotary and would control the intake and exhaust? sorry for a crappy question, im new and trying to learn a lot before the spring.


  2. #2
    I was looking a little at yamahas and there "power valves" which seem to be the same concept as a rave valve but yamahas also have reeds and seadoos don't need reeds? if anyone could clear it up it would be great

  3. #3
    Mod less, ride more! troyheb's Avatar
    Join Date
    Jul 2007
    Location
    Nederland, Texas
    Posts
    8,725
    +1
    1,267
    The rave valves only have an effect on the exhaust.
    The rotary valve controls the intake.

  4. #4
    GGG's Avatar
    Join Date
    Sep 2009
    Location
    Jersey Shore
    Posts
    2,830
    +1
    258
    Reeds and Rotary valves control the intake air like a check valve. Air goes in but cant come back out. RAVE and Power Valves control the exhaust port timing therefor giving the engine a variable power band and the potential to make more power than an engine without an exhaust valve

  5. +1 by:


  6. #5
    Mod less, ride more! troyheb's Avatar
    Join Date
    Jul 2007
    Location
    Nederland, Texas
    Posts
    8,725
    +1
    1,267
    Quote Originally Posted by vincent vega View Post
    I was looking a little at yamahas and there "power valves" which seem to be the same concept as a rave valve but yamahas also have reeds and seadoos don't need reeds? if anyone could clear it up it would be great
    Yes. Power valves are basically the same as the rave valves.

    Seadoo used a rotary valve to air fuel going into the motor.
    Yamaha used reeds to control the air fuel going into the intake. I do not think a rotory valve would work on a 3 cylinder motor.
    But basically, it is 2 different ways, to get the same result.

  7. #6
    if one was to remove the springs from the seadoo 951 rotary valve would this cause a bog down low? i ask because i purchased a 951 and the springs are missing.

  8. #7
    Cliff's Avatar
    Join Date
    Jan 2006
    Location
    Middle Tennessee
    Posts
    207
    +1
    24
    There is no rotary valve on the 951. There are RAVE valves and if the spring is left off yes it will bog at low end.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. What is this on water box... Looks like Rave Valve?
    By dochere195 in forum 2-Stroke Performance
    Replies: 8
    Last Post: 07-28-2015, 04:02 PM
  2. RAVE valves oil soaked? Is this normal?
    By CAVPILOT in forum 2-Stroke Performance
    Replies: 3
    Last Post: 08-25-2014, 07:36 PM
  3. Rave valve / Pressure regulator? How to make sure it is working?
    By chrisracerx in forum Yamaha PWC Performance (2-stroke)
    Replies: 0
    Last Post: 06-26-2011, 03:05 PM
  4. RAVE valve is ticking with exhaust on a 951
    By sea-one in forum Sea Doo Open Discussion
    Replies: 4
    Last Post: 05-27-2011, 11:23 PM
  5. wide rave valves
    By jetski_waxhead in forum 2-Stroke Performance
    Replies: 16
    Last Post: 02-08-2007, 08:37 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
  •