Results 1 to 7 of 7
  1. #1
    AaronC's Avatar
    Join Date
    Aug 2006
    Location
    Sacramento, CA
    Posts
    457
    +1
    4

    Need some help with adjust a thrust

    I know this is the seadoo forum but there are a lot of experienced and knowledgeable folk over here. I've tried the kawi section but I've had no replies in 3-4 days. My question is in regards to boring an exit nozzle on a pump. My stock exit nozzle diameter is 82mm. While tuning the adjust a thrust I found I ran my fastest WITHOUT a shuttle. In fact 1.2 mph faster than the shortest shuttle and shortest bolt and I also had MUCH better acceleration without the shuttle. Without the shuttle in I gained a total of 2-2.5 mph from the impeller. So now I'm trying to figure out how to get the use out of my AAT. How much should I bore so I can get the low end of a big exit nozzle and use a shuttle to provide the top end? I was thinking of going big because I currently run best without a shuttle and have tons of room to grow by adding the shuttles in to provide the top end thrust. Is 3 mm too much? Where should I go to have the work done? A machine shop? Any opinions and comments are appreciated.


  2. #2
    Resident Jicky Jack Jeff C's Avatar
    Join Date
    May 2005
    Location
    Twin Cities, MN
    Posts
    1,153
    Aaron:

    Just keeping this towards the top for you.

    Nobody must know how to help you apparently

  3. #3
    cheatin' piston popper addicted's Avatar
    Join Date
    Jul 2006
    Location
    north jersey
    Posts
    6,188
    +1
    176
    I love my AAT's. But, I have never used one on a kawi. Call bruce. He is a great guy and will work with you every step of the way. # at bottom of page
    http://www.wetwolf.com/kaw/

  4. #4
    I like Boobs. wetwolf's Avatar
    Join Date
    Nov 2005
    Location
    The NSA know's that I'm in Spokane, WA
    Posts
    805
    +1
    106
    Aaron, any machine shop should be able to bore the nozzle. I would start at 2mm and see what happens.

  5. #5
    AaronC's Avatar
    Join Date
    Aug 2006
    Location
    Sacramento, CA
    Posts
    457
    +1
    4
    Thanks for the feedback. I will bore the nozzle and retune. In general how many rpm's does 1 mm give you? Or is it different for every situation?

  6. #6
    Been there and back! BDNJ's Avatar
    Join Date
    Jul 2005
    Location
    Silver Bay, Toms River, N.J.
    Posts
    1,536
    On my RXP, 1mm equals between75-100 rpm. The larger you go, the harder the hit off the line. But you obviously sacrifice top end a little. Set it for what you want most. Most try to find a happy medium. With the RXP/T we have to deal very carefully with the rev limiter or the ecu will shut it down, so be careful not to overrev your ski.

    Hope this helps.
    Last edited by BDNJ; 10-10-2006 at 02:58 PM.

  7. #7
    AaronC's Avatar
    Join Date
    Aug 2006
    Location
    Sacramento, CA
    Posts
    457
    +1
    4
    BDNJ-

    Thanks, that's good info. I took the nozzle to a machine shop and they're taking out 2mm. Even though I can't find any specific info on a kawi, the info I've searched for and replies I've gotten in this forum will most definitely help forecast the end results. I will post up how things went when I get it back on the water. Thanks a bunch guys!

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. I need some help with carb bolts!!!!!!!
    By Ramps in forum Yamaha How To & FAQs
    Replies: 4
    Last Post: 09-15-2008, 07:42 PM
  2. need some help with minor hull repair
    By stingray152003 in forum Yamaha Open Discussion
    Replies: 15
    Last Post: 02-01-2008, 07:52 AM
  3. Need some help with gas valves
    By Robsauto2 in forum Yamaha PWC Performance (2-stroke)
    Replies: 21
    Last Post: 08-13-2007, 11:54 PM
  4. Need some help with a 650 LX
    By utahnewbie in forum Yamaha How To & FAQs
    Replies: 0
    Last Post: 05-04-2007, 11:59 PM
  5. I Need Some Help With My Shark !!!!!!
    By sleblanc in forum Polaris Open Discussion
    Replies: 9
    Last Post: 12-20-2006, 03:17 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
  •