88 650sx only wants to go after a jump/get air
pxctoday

» Log in

User Name:

Password:

Not a member yet?
Register Now!

» Find OEM Parts

» Jobs

» wallpapers

Page 1 of 3 123 LastLast
Results 1 to 10 of 23
  1. #1
    PWCToday Newbie
    Join Date
    Aug 2008
    Location
    mpls mn
    Posts
    34

    88 650sx only wants to go after a jump/get air

    Been trying to sort out a 88 650 I got that didn't want to go, always felt like it was only half throttle

    Then sometimes it goes fine

    Lately I've been able to reliably repeat this if it's running slow but I get the pump out of the water for a sec off a wake etc then it spins up and the ski will rip until i get sick of proposing and let off again

    Also it's taking on water, haven't found any leaks yet, anyone ever have problems with a electric bilge taking on water through the hull fitting ? Thought about adding a check valve or loop

  2. #2
    Attention ***** PWCToday.com Is My Home Away From Home JonnyX2's Avatar
    Join Date
    Jun 2006
    Location
    Sin City USA
    Age
    57
    Posts
    30,354

    Re: 88 650sx only wants to go after a jump/get air

    pop off is set wrong
    Quote Originally Posted by Firebird A/C&Heating View Post
    OMG.....Rules for 550 vintage ski class...550 ski riders do not conform to any kind of rules. That is why you are riding a 550 ski in the first place. Rules suck....
    PS...the rule book will be in my 550 pump
    Quote Originally Posted by WB1994
    Listen , stop your cryin' , its only an X2.

  3. #3
    PWCToday Newbie
    Join Date
    Aug 2008
    Location
    mpls mn
    Posts
    34

    Re: 88 650sx only wants to go after a jump/get air

    ive found confilcting info on what the pop off should be, i rebuilt the stock carb and tested pop off around 32psi, used a sbt rebuilt kit which im now told is not good? this ski ran good for a trip or two after the rebuild.

  4. #4
    PWCToday Newbie
    Join Date
    Jul 2020
    Location
    CT
    Age
    46
    Posts
    18

    Re: 88 650sx only wants to go after a jump/get air

    I have basically the same issue ... and while I'm NO expert on these things I truly believe it to be crank seals. I had the same issue back in the mid-90s and now again it happened last weekend to my 87.

    Blow out the cooling lines, check the exhaust hoses and make sure the carb is tuned first, of course

  5. #5
    PWCToday Regular N.Penley's Avatar
    Join Date
    Aug 2017
    Location
    Boone Lake, TN
    Age
    35
    Posts
    51

    Re: 88 650sx only wants to go after a jump/get air

    I had a 550 that ran the exact same way after a SBT motor swap. I never got it sorted out and sold it. This was my only experience with SBT.


    Sent from my iPhone using Tapatalk

  6. #6
    Attention ***** PWCToday.com Is My Home Away From Home JonnyX2's Avatar
    Join Date
    Jun 2006
    Location
    Sin City USA
    Age
    57
    Posts
    30,354

    Re: 88 650sx only wants to go after a jump/get air

    What carb? Stock or A/M flame arrestor? I am still betting on pop off too high
    Last edited by JonnyX2; 08-24-2020 at 05:33 PM.
    Quote Originally Posted by Firebird A/C&Heating View Post
    OMG.....Rules for 550 vintage ski class...550 ski riders do not conform to any kind of rules. That is why you are riding a 550 ski in the first place. Rules suck....
    PS...the rule book will be in my 550 pump
    Quote Originally Posted by WB1994
    Listen , stop your cryin' , its only an X2.

  7. #7
    PWCToday Newbie
    Join Date
    Aug 2008
    Location
    mpls mn
    Posts
    34

    Re: 88 650sx only wants to go after a jump/get air

    stock carb, stock intake, westcoast pipe. the ski had the carb rebuilt when i got it, and the pop off was set way low like opened at 1-2psi

    i put a new spring it and set it at 19psi

    then i rebuilt the carb and its opening about 32psi

    it worked randomly or for the first few minutes on water at 19 and 32
    Last edited by 7808; 08-25-2020 at 07:24 PM.

  8. #8
    PWCToday Newbie
    Join Date
    Aug 2008
    Location
    mpls mn
    Posts
    34

    Re: 88 650sx only wants to go after a jump/get air

    is there a way to test the external fuel pump? what jets should i be using?
    Last edited by 7808; 08-25-2020 at 07:24 PM.

  9. #9
    Attention ***** PWCToday.com Is My Home Away From Home JonnyX2's Avatar
    Join Date
    Jun 2006
    Location
    Sin City USA
    Age
    57
    Posts
    30,354

    Re: 88 650sx only wants to go after a jump/get air

    The difference between 19 and 32psi pop off is day and night difference. When you rebuilt the carb did you use the spring in the kit or reuse the old one?
    Quote Originally Posted by Firebird A/C&Heating View Post
    OMG.....Rules for 550 vintage ski class...550 ski riders do not conform to any kind of rules. That is why you are riding a 550 ski in the first place. Rules suck....
    PS...the rule book will be in my 550 pump
    Quote Originally Posted by WB1994
    Listen , stop your cryin' , its only an X2.

  10. #10
    PWCToday Newbie
    Join Date
    Aug 2008
    Location
    mpls mn
    Posts
    34

    Re: 88 650sx only wants to go after a jump/get air

    i used the spring in the kit.

    i got the ski with a spring that had almost no hold back pressure, 1-2psi. i replaced it with a spring from the hard ware store cut down then it was at 19 pop off. rebuilt using spring in kit now pop off is around 32

Page 1 of 3 123 LastLast

Thread Information

Users Browsing this Thread

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

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Powered by vBadvanced CMPS v4.2.0