Results 1 to 9 of 9
  1. #1
    my ski has thrust vectoring......does yours??? killcraft's Avatar
    Join Date
    Jul 2009
    Location
    chesapeake Va.
    Posts
    270

    how to tell when to rebuild carbs??

    hey got a question for you guys. visually looking at carbs is there a way to tell if they need to be rebuilt? if they do exactly what are you changing? maybe i really just need a lesson on carbs. when i went through aviation maintenance school if i remember correctly there were two types of carbs pressure and float. which type is on jet ski engines?


  2. #2
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
    Join Date
    Oct 2006
    Location
    Cleveland OH
    Posts
    17,329
    +1
    31
    Often just age would require rebuilding from a preventative maintainence point. But any dry or cracked diaphragms, worn or distorted needles, corrosion, dirt, or rust inside the carbs.

    There are no floats inside a ski, so I'd say pressure.

  3. #3
    my ski has thrust vectoring......does yours??? killcraft's Avatar
    Join Date
    Jul 2009
    Location
    chesapeake Va.
    Posts
    270
    Quote Originally Posted by xlint89 View Post
    Often just age would require rebuilding from a preventative maintainence point. But any dry or cracked diaphragms, worn or distorted needles, corrosion, dirt, or rust inside the carbs.

    There are no floats inside a ski, so I'd say pressure.
    ok good to know also did some research on my own and yes they are pressure carbs due to the fact that in a roll over you would have fuel all in your hull from the float bowl emptying out through the filter
    good stuff

  4. #4

    Join Date
    Jul 2009
    Location
    Nova Scotia
    Posts
    112
    If you store the craft on the offseason it is good practice to clean and inspect your carbs every year prior to riding. Old gas turns to varnish and can plug up carbs and cause lean out conditions and potential engine damage. Gives you a good opportunity to inspect diaphrams for cracks and age and adjust needle seat arms, and do a pop off test.
    Using fuel stabilizer during off season helps but I dont risk it.

  5. #5
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
    Join Date
    Jul 2007
    Location
    Cedar Rapids,Iowa
    Posts
    6,381
    +1
    23
    Here's your carb rebuilding lesson.
    http://shopsbt.com/pdfs/mikunisbn.pdf

    Here's your Mukuni Carb Manual.

    http://5039699694860829161-a-1802744...2dYaTajXCsE%3D

  6. #6
    my ski has thrust vectoring......does yours??? killcraft's Avatar
    Join Date
    Jul 2009
    Location
    chesapeake Va.
    Posts
    270
    ok thanks for the good info. but if i were to replace the needles what sizes would i use (785)

  7. #7
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
    Join Date
    Oct 2006
    Location
    Cleveland OH
    Posts
    17,329
    +1
    31
    Stock came with 2.0 (push in type)

  8. #8
    my ski has thrust vectoring......does yours??? killcraft's Avatar
    Join Date
    Jul 2009
    Location
    chesapeake Va.
    Posts
    270
    both high and low speed needles were 2.0?

  9. #9
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
    Join Date
    Jul 2007
    Location
    Cedar Rapids,Iowa
    Posts
    6,381
    +1
    23
    3 different things,the low,and high speed needles(the ones you screw in and out)normally don't need to be replaced.Xlint is reffering to the needle and seat that shuts of fuel(that the diaphram opens and close)can wear out.The diaphram acts like/replaces the float in a carb.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. How to rebuild Mikuni SBN 38 Triple Carbs
    By BlueFishCrisis in forum Polaris How To & FAQs
    Replies: 30
    Last Post: 06-20-2016, 05:23 PM
  2. When to rebuild carb or clean
    By golferdude in forum Open Discussion
    Replies: 1
    Last Post: 06-18-2014, 10:19 AM
  3. Anyone live in Southern Cal that can teach me how to rebuild my carbs on 1200xl ltd
    By Rookiepwc in forum Yamaha PWC Performance (2-stroke)
    Replies: 3
    Last Post: 09-11-2013, 04:47 PM
  4. How to rebuild stock 99 ultra carbs?
    By screamindemon in forum Kawasaki PWC Performance (2-stroke)
    Replies: 16
    Last Post: 08-03-2011, 09:44 PM
  5. Manual on how to rebuild Carb?
    By TomToro in forum 2-Stroke Performance
    Replies: 4
    Last Post: 07-27-2008, 06:51 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
  •