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  1. #1

    Join Date
    Jun 2007
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    Raleigh, NC
    Posts
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    98 XL1200 carb jetting 44 Mikuni

    I have searched and read dozens of threads. I couldn't find anything specific to a 1998 XL1200 non-pv with respect to jetting. The patient is stock except for the F/A and primer conversion I will add to the otherwise stock setup.

    What is the best setup for these soon to be stock rebuilt SBN 44 Mikunis on this stock motor?

    I was quite surprised to see the stock set up. This is what was in there after dismantling. Is this normal (different pilot sizes)?
    Front Carb Middle Carb Rear Carb
    97.5 pilot 95 pilot 100 pilot
    1.2 N&S dull silver 1.2 N&S dull silver 1.2 N&S dull silver
    135 main 135 main 135 main

    From the vast carb jetting suggestion posts, I found two different suggestions but they are different models and years... Help-confused...
    For an 2005 XLT1200:
    110 Pilots
    125 Mains
    1.5 Needle and seat
    95 Gram Spring (dull silver)

    I have seen these suggestions for a GPR1200 several times:
    110
    125
    1.5
    95GRAM SPRING
    1 1/2 HIGHS
    7/8 LOW
    THATS WHAT I RAN ON MY 1200 AND IT WAS DEAD ON
    A GOOD STARTING POINT
    THIS WAS ALSO WITH FLAME ARRESTORS

    Thx!
    Last edited by PropOrJet; 07-28-2008 at 07:24 AM. Reason: non-pv engine


  2. #2
    Moderator OsideBill's Avatar
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    I moved to this to the old school section since this is a 65U 1200 npv motor in this ski. As for jetting I run the following in my SUV which is the same motor.

    1.5 N&S Gold 115gr spring
    100 pilot jets
    135 main jets
    chokes removed
    R&D power plenum F/A

    This has been a work horse for almost three seasons without an issue using this jetting.

  3. #3
    i went with Bill's suggestions on my 2 98 XL 1200's with the same mods and they are doing fine with perfect wash side note the xl 1200 non pv was only made in 98 so any others will be pv suggestions Z

  4. #4

    Join Date
    Jun 2007
    Location
    Raleigh, NC
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    55
    Thanks Again for all your help O & Z!
    Finally got 98 XL on the water with almost the exact settings you suggested. Wanted to reply with adjustments to hopefully provide some guidance to the next newbie's that try this and get some thoughts on results. Here is what I used:
    1.5 N&S silver spring that yielded 42# pop off
    100 pilot jets
    135 main jets
    chokes removed
    Riva F/A with the annodized adapters.
    Started with 3/2 turn out on the high adjuster and 1 turn out on the low adjuster. From idle to ~1/2 throttle there was a hesitation. I backed off 1/8 at a time and got rid of the hesitation at ~ 1/4 more. Ended up at ~ 1 3/4 out from stop on the low. From idle to 3/4 throttle was great. Pulled strong all the way up to about 53MPH. WOT would slow down to about 49 and could hear the bog. I started by increasing from 1 turn out on the high's to 1 1/4 turns out and it got a bit worse. I backed off to 3/4 turn out and speed went up slightly. I backed off to ~1/2 turn out on the high speed adjusters and the bog was gone. 98 XL1200 accelerates from idle to WOT smoothly and pulls really hard. Running great now! Thoughts on the final setting of highs out only 1/2 turn?

    Thanks!

  5. #5
    kinda a dead thread but all the different pilots came from the factory like that... my gp 1200 (same motor same carbs) theres three different pilot sizes from front to back. and it sreams and all three plugs look identical, want to check to make sure you stuff is running the same on all three cylinders...pull the head and check the wash...

  6. #6
    Good update!!! What is your top speed now?? 53? Z

  7. #7
    I wanna say i gps around 57-59 but i havent ridden it in 3 months, thats at sea level to, aftermarket prop and rideplate and special speed stickers

    dreamo meter had me at 63 but i know thats a lie, I have ridden up to 66 on a 250 that was bone stock, I was not in the 60's with the gp, no way

    Its about the best feeling to go flying past those bass boats that say there running 70 when you only doing mid 60's

  8. #8
    Quote Originally Posted by chritopherlloyd View Post
    I wanna say i gps around 57-59 but i havent ridden it in 3 months, thats at sea level to, aftermarket prop and rideplate and special speed stickers

    dreamo meter had me at 63 but i know thats a lie, I have ridden up to 66 on a 250 that was bone stock, I was not in the 60's with the gp, no way

    Its about the best feeling to go flying past those bass boats that say there running 70 when you only doing mid 60's
    I was out with my 2 1200 xl's last weekend ( they gps at 60) my boy and I walked past a jet boat! .. I don't think they found it as cool as we did

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