GS550 Carb Vacuum line issues
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GS550 Carb Vacuum line issues

This is a discussion on GS550 Carb Vacuum line issues within the Technical forums, part of the Caferacer.net Forums category; I have a GS550 with BS32SS mikuni carbs and I haven't been able to get a real answer from anyone as to why I'm having ...

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  1. #1
    Mr.
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    GS550 Carb Vacuum line issues

    I have a GS550 with BS32SS mikuni carbs and I haven't been able to get a real answer from anyone as to why I'm having this issue or how to fix but maybe you guys can help here.

    The bike had a leaky vacuum actuated petcock, so I decided to install a manual fuel valve and set the petcock to prime. I blocked the vacuum line that actuated the regular valve.

    Now that I have everything back together, there are two lines that I have been told by some are supposed to go to the ground, to the airbox, to the other carb vent, etc,.

    These lines are pretty peculiar though in a few ways:

    1. the line on the left side of the carbs doesn't seem to do much of anything when blocked
    2. the line on the right side makes the bike idle at around 4000rpm when blocked and slowly bog down and stall when open

    What the hell are these lines for, why do they make this happen, and WHERE DO THEY CONNECT???

  2. #2
    Senior Member hillsy's Avatar
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    They are the float bowl breather pipes. They should just be routed down towards the swingarm pivot area. Don't block them or connect them to anything else.

  3. #3
    Senior Member goldy's Avatar
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    How about some pictures?
    “And this you can know – fear the time when Manself will not suffer and die for a concept, for this one quality is the foundation of Manself, and this one quality is man, distinctive in the universe.”
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  5. #4
    Mr.
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    I'll grab some this weekend.

    I'm not a carb expert but it seems like the engine runs immensely better when I have the float bowl breather on the right plugged. It revs really high but doesn't bog when throttled.

    Can anyone explain why this happens? I know it's not my solution but I'm just curious.

    I think I also have a vacuum leak somewhere in the main airbox from incorrect reassembly and this could be causing the problems.

  6. #5
    Senior Member hillsy's Avatar
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    Blocking the breather is probably changing the fuel levels in the bowls - IE: you've probably got them set wrong.

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