Results 1 to 6 of 6
  1. #1

    Carb rebuild GP1200

    I decided to tear-down the carbs this past weekend and do complete rebuilds and go with pod arrestors. The ski is completely stock besides what will be the arrestors. I'm putting in the 1.5 N&S. I need to go down to the 95g spring, correct? What jet sizes do I have to move to though? Stock is 135 main and various pilots, have I read correctly in other posts that if I went to 100's for all the pilots and kept the mains at 135, I'd be OK? Just need this info before I submit my order.

    Thank you.

    Jason


  2. #2
    Diznasty's Avatar
    Join Date
    Jul 2011
    Location
    ERIE-sistable
    Posts
    140
    Check the FAQ's section. Osidebill has a write-up for what needs done. You will need t-handles too and your tamper caps drilled out.

  3. #3
    Yamaha artisan Cutlass's Avatar
    Join Date
    Oct 2010
    Location
    Madison, WI, USA
    Posts
    2,500
    +1
    55
    Quote Originally Posted by Diznasty View Post
    Check the FAQ's section. Osidebill has a write-up for what needs done. You will need t-handles too and your tamper caps drilled out.
    This guy has a GP not GPR so he won't need to worry about tamper caps.
    There is a Sticky for homemade T-handles for these old school GPs also.

    Quote Originally Posted by JayGP1200 View Post
    I decided to tear-down the carbs this past weekend and do complete rebuilds and go with pod arrestors. The ski is completely stock besides what will be the arrestors. I'm putting in the 1.5 N&S. I need to go down to the 95g spring, correct? What jet sizes do I have to move to though? Stock is 135 main and various pilots, have I read correctly in other posts that if I went to 100's for all the pilots and kept the mains at 135, I'd be OK? Just need this info before I submit my order.

    Thank you.

    Jason
    I have a 97 GP1200. I have Riva cone flame arrestors, choke plates removed (primer installed) and it has stock compression and stock ports.
    My carbs are set up like this: 135 main jets, 100 pilot jets, Low speed screws out 1 1/4 turns, High speed screws out 1 1/2 turns. 1.5 N/S with 115 gram spring. All three carbs are set up exactly the same. Runs perfect.

  4. #4
    Yamaha artisan Cutlass's Avatar
    Join Date
    Oct 2010
    Location
    Madison, WI, USA
    Posts
    2,500
    +1
    55
    Another thing to add. You should use genuine Mikuni rebuild kits and genuine Mikuni needle and seats. There have been several posts recently of people having bad luck with aftermarket kits. Another plus is that the mikuni kits already come with the 115 gram springs so you won't have to buy those separately.
    Last edited by Cutlass; 06-20-2012 at 08:37 PM.

  5. #5
    Cutlass.. I can't seem to find the sticky about the homemade T handles. Can you point me in the right direction? Is the "main" jet also known as the High speed jet and pilot -> low speed jet.

    I am taking your advice and ordering the Mikuni parts today.

    Thanks.

  6. #6
    Yamaha artisan Cutlass's Avatar
    Join Date
    Oct 2010
    Location
    Madison, WI, USA
    Posts
    2,500
    +1
    55
    Yes main=high and pilot=low
    Here's the T-handle sticky:

    http://www.greenhulk.net/forums/showthread.php?t=144929

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. New-to-me 1999 GP1200 carb rebuild/first questions
    By willg in forum Yamaha Open Discussion
    Replies: 2
    Last Post: 12-22-2014, 09:42 PM
  2. top end rebuild/carb rebuild on gp1200...need advice
    By yamafreak in forum Yamaha Open Discussion
    Replies: 50
    Last Post: 06-17-2013, 06:17 AM
  3. 99 GP1200 Carb Rebuild
    By Speedline in forum Yamaha PWC Performance (2-stroke)
    Replies: 8
    Last Post: 04-27-2013, 12:43 PM
  4. GP1200 Carb Rebuild
    By JayGP1200 in forum Yamaha PWC Performance (2-stroke)
    Replies: 4
    Last Post: 06-22-2012, 08:54 PM
  5. 1998 GP800/GP1200 Carb Rebuild
    By DTV in forum Yamaha Old School Skis
    Replies: 7
    Last Post: 06-29-2007, 12:32 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
  •