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  1. #1

    Are my carb numbers right?

    I am in the process of going thru my '93 650. Everything is stock and it has triple 38mm Mikuni's. I have them cleaned and all apart right now. On many of the threads, I see carb jet numbers like 180, 177.5 etc. With my magnifying glass, my 64 year old eyes read:

    main fuel needle valve inlet of 1.5
    Main jet 77.5
    Pilot jet 77.5

    Are these numbers right? If so...what are the numbers i read on all the posts? I plan on keeping everything stock except for adding a three outlet fuel pump and possible new F/A's (because I cant reach any adjusting screws with the stock one on!)


  2. #2
    Polarisitis loonatik's Avatar
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    Quote Originally Posted by ltmark View Post
    ...
    main fuel needle valve inlet of 1.5
    Main jet 77.5
    Pilot jet 77.5
    ...
    Yes those numbers are correct for your ski.
    Be sure to count number of turn(s) it take to close each adjuster, in 1/8 turn increment, before removing them for cleaning. If you missed that part, then here're the stock settings:
    Hi = 7/8 Mag | 3/8 Cen | 5/8 PTO
    Low = 1/4 (all)
    Pop off = 10-18 PSI

    Other numbers you see are for different ski models, they don't apply to yours.

  3. #3
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    You're the second guy this week to mention 1.5 needles and seats. i thought ALL mikuni carbs came with 2.0 NS combos. I have to look into that one....


    Yes, the jets are 77.5 for both.

  4. #4
    Polarisitis loonatik's Avatar
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    Quote Originally Posted by xlint89 View Post
    You're the second guy this week to mention 1.5 needles and seats. i thought ALL mikuni carbs came with 2.0 NS combos. I have to look into that one....


    Yes, the jets are 77.5 for both.
    I'll be the 3rd, that's what mine was.

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