Results 1 to 8 of 8
  1. #1
    jbryzek's Avatar
    Join Date
    Aug 2013
    Location
    Green Bay, Wi
    Posts
    132
    +1
    6

    Can I shim a spark nozzle to get more bow up

    Guys,

    I looked around a bit and did not find anything on GH about this. (it could be out there but I missed it)

    Anyone have any experience permanently shimming the exit nozzle on a spark (or i guess any other sea doo) to get more bow up.

    We have the engine in another application and are looking to bring the nose up a bit on the boat to help with high speed steering. Boat is running very flat with lots of hull in the water. Anyone have any experience or reference to this? I have not dealt with custom modifications on any of these products before as we just tend to you off the shelf and stock components on our builds.

    Looking for any guidance. (please note no room for vts etc.) this would be on stock spark pumps with manual reverse bucket packages installed.


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
    Join Date
    Jul 2007
    Location
    near Toronto, Canada
    Posts
    36,599
    +1
    1,276
    What you are looking for is often called a 'pump wedge' that fits just in front of the jet pump main exit nozzle. The wedge changes the exit angle of the pump and forces the rear downwards, causing a lifting effect at the bow.

    I do not know if there is an exisiting pump wedge for the SeaDoo Spark.
    http://www.4-tecperformance.com/inde...ath=18_214_227

    If you cannot find what you need, the advent of 3D printing makes it possible to have them custom made. And you can experiment with the amount of angle to find the optimal combination for your hull.

  3. #3
    jbryzek's Avatar
    Join Date
    Aug 2013
    Location
    Green Bay, Wi
    Posts
    132
    +1
    6
    thanks k447. I have also heard reading another forum about some guys spark porpoising that you can switch the venturi from bow down position to bow up position by changing or swapping the bushings? He referred to part 710 and 720 I think.
    http://partsfinder.onlinemicrofiche....TEM---EXTERNAL

    I have a full pump assembly in the shop right now and was going to take a look at it.

  4. #4
    jbryzek's Avatar
    Join Date
    Aug 2013
    Location
    Green Bay, Wi
    Posts
    132
    +1
    6
    Quote Originally Posted by jbryzek View Post
    thanks k447. I have also heard reading another forum about some guys spark porpoising that you can switch the venturi from bow down position to bow up position by changing or swapping the bushings? He referred to part 710 and 720 I think.
    http://partsfinder.onlinemicrofiche....TEM---EXTERNAL

    I have a full pump assembly in the shop right now and was going to take a look at it.

    Looks like they come from the factory in the bow up configuration. Reversing the 720 bushing gives it more bow down angle on the nozzle.

  5. #5
    JeffSki's Avatar
    Join Date
    Nov 2006
    Location
    Florida 33410
    Posts
    218
    +1
    4
    Mine came in the bow down position (3up ski). Tried both ways, does make a diff.

  6. #6
    Meen66's Avatar
    Join Date
    Dec 2013
    Location
    Huntsville, ontario
    Posts
    224
    +1
    42
    http://www.greenhulk.net/forums/show...=223805&page=6

    Refrence comment 53 by Water Pig

    Is that what you where talking about (only flipping it for bow up)

    As Water pig has olbviusly done this might wanna shoot him a message.

  7. #7
    jbryzek's Avatar
    Join Date
    Aug 2013
    Location
    Green Bay, Wi
    Posts
    132
    +1
    6
    Quote Originally Posted by Meen66 View Post
    http://www.greenhulk.net/forums/show...=223805&page=6

    Refrence comment 53 by Water Pig

    Is that what you where talking about (only flipping it for bow up)

    As Water pig has olbviusly done this might wanna shoot him a message.

    Yes, that is what I was referring to. It seems as thought the few packages we have gotten have the bushing turned into a bow up position from the factory. I took one in the shop apart yesterday just to see how it worked and it seem flipping it 180 does in fact give it some down angle. Unfortunetly I am looking for some up angle.

    Stock it seems as though its at a "level" angle and can only really be adjusted down. Not up...unless I am missing something.

  8. #8
    EH Team Water Pig's Avatar
    Join Date
    Oct 2007
    Location
    St. Catharines, Ontario, CANADA
    Posts
    773
    +1
    66
    That is true ... reversing the bushing 180 only provides a down bow or basically level...

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. 01 virage no spark...where to get ohm specs?
    By polarisjunky in forum Polaris How To & FAQs
    Replies: 2
    Last Post: 06-13-2011, 01:06 AM
  2. can any give me advice where to get theres parts
    By dobbo in forum Kawasaki PWC Performance (4-stroke)
    Replies: 2
    Last Post: 04-22-2010, 06:16 AM
  3. How to get more speed from your RXT!!!
    By Jetsam in forum 4-Tec Performance
    Replies: 18
    Last Post: 07-15-2008, 01:14 AM
  4. Help!!!! How to get undercarriage lined up...
    By Ford550 in forum Polaris How To & FAQs
    Replies: 7
    Last Post: 11-21-2007, 03:28 AM
  5. How to get more speed from 250x
    By jimhart in forum Kawasaki PWC Performance (4-stroke)
    Replies: 31
    Last Post: 02-09-2007, 10:31 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
  •