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Thread: keihin jet direction

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    Member safayan's Avatar
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    keihin jet direction

    absolutely dumb question incoming. have a new 72 CL350, the carbs came separated from the bike and they didn't have primary or secondary main jets. So I bought a set of jets with o-rings not installed on them, and I'm now realizing I don't know which space on the jets to put the o-ring on and thus which way the jets go directionally in their seats. I realized this after I installed them as pictured. is this correct? I'm mostly sure this is correct because you can see the size of the jet the way they're currently installed, but who knows







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    Last edited by ancientdad; 11.13.22 at 9:50 AM.

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    Administrator LongDistanceRider's Avatar
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    The O-ring goes on the other groove. The tapered nozzle end groove is for the jet holder.
    Jim O'Brien
    1979 CM400T aka the Roadbike, 1978 CB400T1 semi restored, 1972 CL350K4 restoration and the 1971 SL350K1 disaster zone.
    Plus 2 SL350K0's , 2 SL350K1's, 1 CL350K0 and 1 CL350K1 waiting for space and time
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    The way you have the o-ring in your pictures looks correct;you can read the jet# size from the bottom,and the black steel spring holder goes into the wide groove at the bottom with the jet #.

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    Member safayan's Avatar
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    keihin jet direction

    ah, the ol' back to back pieces of contradictory advice... lol.

    https://www.dimecitycycles.com/keihi...00f-cb550.html

    this makes it appear that I have them installed correctly.


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    Quote Originally Posted by safayan View Post
    ah, the ol' back to back pieces of contradictory advice... lol.

    https://www.dimecitycycles.com/keihi...00f-cb550.html

    this makes it appear that I have them installed correctly.


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    Yes,the way you have it .

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    Quote Originally Posted by LongDistanceRider View Post
    The O-ring goes on the other groove. The tapered nozzle end groove is for the jet holder.
    So I just found some extra stock CB550F jets lying around and they have the o-ring in the same groove as I have them installed for these jets: the o-ring installed on the end of the jet with the shallow hole, meaning the end with the deep hole in the jet is facing down into the carb bowl. Are your 350 jets different?





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    Last edited by ancientdad; 11.13.22 at 2:53 PM.

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    Administrator LongDistanceRider's Avatar
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    OK, I just looked at the jets for half a dozen 350 carbs I'm working with. The jet number stamped on the side is the end for the jet holder. The other end gets the O-ring which is where the taper section inside is.
    So your O-ring placement in the pictures is correct, my reply was wrong.
    Jim O'Brien
    1979 CM400T aka the Roadbike, 1978 CB400T1 semi restored, 1972 CL350K4 restoration and the 1971 SL350K1 disaster zone.
    Plus 2 SL350K0's , 2 SL350K1's, 1 CL350K0 and 1 CL350K1 waiting for space and time
    Contact: 408-239-9580 or [email protected]

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    Member safayan's Avatar
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    Gotcha, thanks for confirming. Now we know


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    And this little exchange is exactly why I read and participate in VHT. People just working out an answer, no bs, no chest pounding.
    Bob
    1967 CB450K0 Black Bomber project, lots of scooter experience.

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