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  1. #1
    pilo704's Avatar
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    gp1200 carb questions

    hey, im looking for the stock jetting on a gp 1200, i know its 135m but i forget the pilots...i found it before but i have been searching with no return...also when people refer to the carbs as carbs 1,2 and 3 which one is which...thanks alot


  2. #2
    since I didn't see what year craft u have go here http://www.yamaha-motor.com/waverunn...r_manuals.aspx

    and click parts , then your craft , then carburetors it will list the jetting and #1 is the front of craft carb

  3. #3
    pilo704's Avatar
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    yeah sorry its a 97 gp1200

  4. #4
    Well it appears as the Yami pinheads that compile the microfiche screwed up again! I don't see the pilots listed

  5. #5
    Moderator OsideBill's Avatar
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    92.5, 95, 97.5 carbs 1-3 respectively. #1 is the front or Mag carb, #3 is rear or PTO hope this helps.

  6. #6
    Dave Sharp dav_dman's Avatar
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    Bill I thought i remembered #1 being 100 pilot. 95 was the smallest one, center cyl.. do remember that..

  7. #7
    Moderator OsideBill's Avatar
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    could be Dave I put them all to 100 anyways and change the N&S to a 1.5 and gold spring.

  8. #8

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    Not trying to hijack but I am wondering why does the factory stagger the jetting on multiple carbs. I ran into the same thing with my 660 Raptor

  9. #9
    Not sure! and they have some well paid engineers! however I use underpaid Osides jetting in 2 of my 1200 crafts with very good results

  10. #10
    Marley Creek, MD
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    Quote Originally Posted by roost5o View Post
    Not trying to hijack but I am wondering why does the factory stagger the jetting on multiple carbs. I ran into the same thing with my 660 Raptor

    Believe the raptor does it to stagger velocity/timing of carb, but that is a very different setup as it is 2 carbs on 1 cylinder, basically to make it have smoother power, and different port size. Could be wrong but i think the raptor actually has 2 different bores on each carb. (btw: i can't wait til' it cools off outside for some trail riding on my rappy)

    No clue why they're different on jetskis though.... unless it might be from pressure drop across the fuel lines due to length/tees/fittings on hoses changes volume/pressure? dunno.

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