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  1. #1
    StevoH@O's Avatar
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    Aug 2013
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    Keihen Carb question

    I am rebuilding my dual carbs. I decided to remove all of the remnants of yellow gasoline found in the system. I went to blow out the bronze connector (on the right side of the carb body). It appears to be a passage to the bottom of the needle valve assembly. So when I'm blowing over 100 PSI through the brass inlet, I estimate only about 1/10 of the air is passing through to the opening by the base of the needle valve. Is this appropriate? It seems like air should be passing much more readily through that passage. Any comments or suggestions? Should I try a wire or pipe cleaner through the passage?

    See picture below:


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    Also, I have a oil pump that was meant for a single carb (One line to the single carb) . I am switching to a dual carb. Can I simply split the single line with "Y" junction and supply both carbs with enough oil?

    Thanks for the suggestions.

    Stevo


  2. #2
    casey67's Avatar
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    That looks like the front carb-the carb without the fuel pump. That would be the "fuel return" fitting/line to the tank, therefore it will have the fuel return restrictor built into the carb body. It will be restricted but still needs to be check or cleaned out.
    In the picture, the hose from the rear carb should be the fuel feed hose.

    The oil pumps/fitting are calibrated to deliver so much oil per cylinder. The arm is adjustable, but not sure if you could double the output inorder to feed 2 cylinders with one hose. Safer to use a 2 outlet oil pump.

  3. #3

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    Quote Originally Posted by casey67 View Post
    That looks like the front carb-the carb without the fuel pump. That would be the "fuel return" fitting/line to the tank, therefore it will have the fuel return restrictor built into the carb body. It will be restricted but still needs to be check or cleaned out.
    In the picture, the hose from the rear carb should be the fuel feed hose.

    The oil pumps/fitting are calibrated to deliver so much oil per cylinder. The arm is adjustable, but not sure if you could double the output inorder to feed 2 cylinders with one hose. Safer to use a 2 outlet oil pump.

    Safest to premix. When in doubt, premix, I think 40:1 or 32:1 is right, I don't recall.

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