Results 1 to 9 of 9

Thread: Loss of RPMs

  1. #1

    Loss of RPMs

    I have a 97 GTX that will not rev over 6550 in the water.I've cleaned the RAVE valves,and even took the springs out and tried it.Before it was turning up to around 6950.The compression is the same on both cylinders,and it runs fine just won't rev all the way up over 6550.Has any one else ever had this problem?


  2. #2
    96XPSS's Avatar
    Join Date
    Feb 2006
    Location
    Warner Robins, GA Home of the 2007 All-Star Little League World Champions!
    Posts
    4,361
    Did you run it with the seat and RAVE caps off to verify they are fully opening?

    If so, then the water regulating valve on top of the waterbox could be bad, allowing too much water into the midpipe at high rpm.

  3. #3
    Thanks,I'll try that.

  4. #4
    Is there any way to check the water regulator?

  5. #5

    Join Date
    Feb 2008
    Location
    Perth, Western Australia
    Posts
    227
    Quote Originally Posted by DTH357 View Post
    Is there any way to check the water regulator?
    I would like to know this also.

    Can anyone offer some help? Thanks

  6. #6
    96XPSS's Avatar
    Join Date
    Feb 2006
    Location
    Warner Robins, GA Home of the 2007 All-Star Little League World Champions!
    Posts
    4,361
    Remove the top of the regulating valve. Pull up on the bellow, if it slips out of the housing with the plastic shaft included (about 7/8" in diameter), then it is bad. The plastic should stay stationary inside the housing. Only the SS center shaft should move.

    Older versions of WRVs were bad about his happening.

  7. #7

    Join Date
    Feb 2008
    Location
    Perth, Western Australia
    Posts
    227
    Quote Originally Posted by 96XPSS View Post
    Remove the top of the regulating valve. Pull up on the bellow, if it slips out of the housing with the plastic shaft included (about 7/8" in diameter), then it is bad. The plastic should stay stationary inside the housing. Only the SS center shaft should move.

    Older versions of WRVs were bad about his happening.
    Thanks for that. I pulled the top of the regulator and pulled diaphragm up and it would only move about 10mm and nothing came apart. Looked like it was in tact in there.

  8. #8
    Quote Originally Posted by 96XPSS View Post
    Remove the top of the regulating valve. Pull up on the bellow, if it slips out of the housing with the plastic shaft included (about 7/8" in diameter), then it is bad. The plastic should stay stationary inside the housing. Only the SS center shaft should move.

    Older versions of WRVs were bad about his happening.
    Thanks for the info, cause mine's been loose for years. I'm going to glue it back in, heck even an o-ring should work.

  9. #9
    96XPSS's Avatar
    Join Date
    Feb 2006
    Location
    Warner Robins, GA Home of the 2007 All-Star Little League World Champions!
    Posts
    4,361
    Although I haven't tried it on this yet...I bet a small amount of Gorrila Glue would be a permanent fix too.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Loss of rpms
    By rxp05 in forum 4-Tec Performance
    Replies: 10
    Last Post: 07-07-2007, 01:18 AM
  2. Loss Of Rpm's
    By bling_bling_420 in forum 4-Tec Performance
    Replies: 10
    Last Post: 08-01-2006, 08:41 AM
  3. Loss of RPMS! Help
    By Chrisrokc in forum Yamaha PWC Performance (2-stroke)
    Replies: 10
    Last Post: 06-06-2006, 06:04 PM
  4. Skat Trak SS wear ring/double bearing pump mod loss of rpms
    By Enufpwr in forum 4-Tec Performance
    Replies: 11
    Last Post: 06-29-2005, 08:11 PM
  5. Jerry - Loss of rpm - loss of speed
    By RXPDAVID in forum 4-Tec Performance
    Replies: 5
    Last Post: 06-13-2005, 03:47 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
  •