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Carburettor overflow question

Discussion in 'XJ Technical Chat' started by markie, Feb 7, 2010.

  1. markie

    markie Member

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    My Mikuni BS32 rack seems to have two overflows, between 1 and 2 AND 3 and 4. Only one had an overflow pipe connected but I imagine they both should have?

    I checked the Yamaha parts diagram - it's not shown.
     
    markie, Feb 7, 2010
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  2. wizard

    wizard Active Member

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    Yes Markie, they should & make sure the tubes come straight up & over the back of the air box.
     
    wizard, Feb 7, 2010
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  3. markie

    markie Member

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    Is the idea that they are a vent - or an overflow? The one that was on mine exited the rack and went down next to the battery breather!
     
    markie, Feb 7, 2010
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  4. wizard

    wizard Active Member

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    Some Mikunis have both, but if they are overflows & point down, they tend to syphon, how many pipes you got in total?
     
    wizard, Feb 7, 2010
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  5. markie

    markie Member

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    3- like yours. The fuel supply is in the centre and the two overflows as I described between 1&2 and 3&4.

    Do you route yours over the airbox THEN down alongside the battery breather pipe?

    Thanks
     
    markie, Feb 7, 2010
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  6. wizard

    wizard Active Member

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    Yes the higher pair go up & over the air box & down the back.
     
    wizard, Feb 7, 2010
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