Results 1 to 6 of 6
  1. #1

    Join Date
    Oct 2006
    Location
    Central Florida
    Posts
    3

    Searched - Piston Wash Questions

    Question for the tuners out there - How long does it take after a jetting change for the piston wash pattern to reflect the new mixture?

    And do you check wash paterns like a plug chop at full throttle? Does the wash represent full throttle mixture, or just an overall average?

    Finally, the jetting on both carbs (OEM38s on a 2000 SuperJet 701) is identical, but there's significant variance from one cylinder's wash pattern to the other. Normal? (Professionally ported BTW).

    Thanks.


  2. #2
    Moderator RX951's Avatar
    Join Date
    Apr 2005
    Location
    League City, Texas
    Posts
    16,066
    +1
    23
    Welcome to the forum Skidaddy.
    Someone should be able to answer your specific question shortly

  3. #3
    Duke's Avatar
    Join Date
    Jul 2006
    Location
    Florida
    Posts
    10,004
    +1
    406
    Skidaddy, In my experience it takes several tanks of gas to
    develop a solid wash. However the new wash is usually visable
    on top of the old wash within a couple of passes. Chopping the
    throttle doesn't effect wash but when you idle in it tends to
    put wet fuel on the piston making it a little harder to see with
    the borescope due to the reflection.
    As far as the difference on the 701 it is not unusual to have to
    tune each cylinder individually due to pipe characteristics and
    exhaust manifold designs. What pipe do you have?

  4. #4

    Join Date
    Oct 2006
    Location
    Central Florida
    Posts
    3
    It's a Factory Pipe Limited "B" Pipe, stock waterbox (waterbox is fairly dried out).

  5. #5
    Duke's Avatar
    Join Date
    Jul 2006
    Location
    Florida
    Posts
    10,004
    +1
    406
    SkiDaddy, contact Tim Judge. I think he was instramental on developing
    this pipe.
    Eveyone else seems to be obsessed with having a section of the forum
    dedicated to themselves.
    I am not a top level tuner by any means but hope I helped!
    Most of the time the forum is more helpful.

  6. #6
    All hail the Chief! fullboogie's Avatar
    Join Date
    Nov 2005
    Location
    Texas
    Posts
    3,156
    +1
    44
    First of all, Pistonwash is a low-down, dirty scoundrel. He still owes me money from MB1. Second, he'll eat $80 worth of food at dinner then tell you he left his wallet at home. Then there's the whole "Jergens and tube sock" fetish.

    Wait a minute, is this post about Mike or what?

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. piston wash question.
    By zacc300 in forum Yamaha PWC Performance (2-stroke)
    Replies: 3
    Last Post: 11-01-2012, 08:55 PM
  2. Piston Wash Question SL750
    By skigolfnut in forum Polaris Open Discussion
    Replies: 5
    Last Post: 04-11-2010, 10:31 PM
  3. Piston Wash Question
    By kl7741 in forum Polaris Open Discussion
    Replies: 9
    Last Post: 04-13-2009, 08:57 AM
  4. Piston wash question
    By CanadianGPR in forum Yamaha PWC Performance (2-stroke)
    Replies: 3
    Last Post: 10-28-2008, 08:28 PM
  5. piston wash questions...
    By gorilla03 in forum Polaris Open Discussion
    Replies: 35
    Last Post: 07-03-2007, 11:09 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
  •