Calling Matt and Mandriva, jetting spec?
pxctoday

» Log in

User Name:

Password:

Not a member yet?
Register Now!

» Find OEM Parts

» Jobs

» wallpapers

Results 1 to 10 of 10
  1. #1
    Top Dog Benflynn's Avatar
    Join Date
    Aug 2015
    Location
    Birmingham
    Posts
    1,835

    Calling Matt and Mandriva, jetting spec?

    Current set up
    r&d f/a, Spx water box, 180psi, runs awesome 6850-6900rpm(tiny tach)
    new set up adds
    rossier, microtouch ecwi, tru 40mm carbs w primers

    so, where do y’all think to start on jetting for the modified carbs, my guess is a lil lower pop off and lil bigger jets or maybe a turn or so.

    Also I have a RFI pimp and impeller to test and a slimline 17/25 since they are here.
    Last edited by Benflynn; 06-19-2019 at 05:01 PM.

  2. #2
    PWCToday.com Is My Home Away From Home Matt Braley's Avatar
    Join Date
    Dec 2011
    Location
    Niceville, FL
    Age
    45
    Posts
    3,122

    Re: Calling Matt and Mandriva, jetting spec?

    I'd go with 2.0 needle & seats with a pop off at 20ish, 75 lows, 145 highs. Let rpm determine where you turn your high speed needles. Start at 1 turn then open 1/2 to see if rpm goes up or down. Like Mr. Bill said give 50 rpm back. After achieving peek rpm crack the highs open a little make sure your on the rich side of the edge.

    With water injection on the Rossier pipe you can probably get away with a 100 jet under the 1/2 fitting, maybe even less if you want to push it.

  3. #3
    PWCToday.com Is My Home Away From Home Grumpy Old Guy's Avatar
    Join Date
    Dec 2003
    Location
    Sunny Fla
    Posts
    25,599

    Re: Calling Matt and Mandriva, jetting spec?

    Quote Originally Posted by Benflynn View Post
    Current set up
    r&d f/a, Spx water box, 180psi, runs awesome 6850-6900rpm(tiny tach)
    new set up adds
    rossier, microtouch ecwi, tru 40mm carbs w primers

    so, where do y’all think to start on jetting for the modified carbs, my guess is a lil lower pop off and lil bigger jets or maybe a turn or so.

    Also I have a RFI pimp and impeller to test and a slimline 17/25 since they are here.
    Impeller sounds kinna big ??

  4. #4
    Top Dog Benflynn's Avatar
    Join Date
    Aug 2015
    Location
    Birmingham
    Posts
    1,835

    Re: Calling Matt and Mandriva, jetting spec?

    I just happen to have it, I ran it once on a 657x and it was way lighter than that stock one, would pull harder but the 657 would blow it out if you didn’t til into it. Really want to see what it will do

  5. #5
    PWCToday.com Is My Home Away From Home Matt Braley's Avatar
    Join Date
    Dec 2011
    Location
    Niceville, FL
    Age
    45
    Posts
    3,122

    Re: Calling Matt and Mandriva, jetting spec?

    In a Skat swirl the 17/22 would be more appropriate but the Slimeline #'s are different. I think you will like the feel of the RFI better hopefully it will be as fast.

  6. #6
    PWCToday.com Is My Home Away From Home Grumpy Old Guy's Avatar
    Join Date
    Dec 2003
    Location
    Sunny Fla
    Posts
    25,599

    Re: Calling Matt and Mandriva, jetting spec?

    If its not a big hub prop your wasting your time with the RFI pump.

  7. #7
    Top Dog Benflynn's Avatar
    Join Date
    Aug 2015
    Location
    Birmingham
    Posts
    1,835

    Re: Calling Matt and Mandriva, jetting spec?

    Was going to try 17/25 is stock pump. It actually reads 7/20 but when I looked it up it was 17/25. I see no reason why the 657 should of been able to cavitate it if you jumped on it too hard, so I am dubious that it is 17/25. Rfi has the stock swirl in it. Figure I’ll swap in rfi once new set up is tuned, while rfi is in I’ll throw my mystery skat in the stock pump

  8. #8
    Top Dog Benflynn's Avatar
    Join Date
    Aug 2015
    Location
    Birmingham
    Posts
    1,835

    Re: Calling Matt and Mandriva, jetting spec?

    Took it out this morning with new b8es to get a smooth water run in and make sure it was 100% before I start swapping parts. Ran an easy 6930-6950.

  9. #9
    Top Dog Benflynn's Avatar
    Join Date
    Aug 2015
    Location
    Birmingham
    Posts
    1,835

    Re: Calling Matt and Mandriva, jetting spec?

    Do i have to use a spray bar for the water injection, i do not have one. If not do I jet that fitting, it’s a plug now

  10. #10
    PWCToday.com Is My Home Away From Home Matt Braley's Avatar
    Join Date
    Dec 2011
    Location
    Niceville, FL
    Age
    45
    Posts
    3,122

    Re: Calling Matt and Mandriva, jetting spec?

    It's better to have a spray bar because it directs the spray down stream. It's not a must though. Jet the fitting with a 125.

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