Question about 1983 Honda GL 1100 Innerstate Gold Wing

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How much vaccuum, should i have from the suction line from carb to spark advancer ...83 interstate.

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  • peter dettmann May 03, 2010

    hi. the vacuum at the carb take of ,is very weak at low revs [ none actually] . but will cling to finger at higher revs ,not that great though . i can hear unit clicking when i **** on the tube on the advancer.........i had a friend rev the engine while i watched with the cover off the advancer........no movement untill 2----------3 k revs can the outlet from carby be blocked on the inside. pd.

  • peter dettmann May 03, 2010

    the bike knocks badly when reved quickly from idle, if i set the idle at 12 to 14 hundred revs it does not knock.

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Hi,
There should be SOME vacuum at the spark advance unit. Not enough to **** a dimple in your thumb, but some, pulsing on intake strokes, particularly with the throttle off. The vacuum hose is connected to one of the carbies. It would probably be dropping a cylinder with engine at idle speed if the hose became disconnected. The easiest way to check that you have the correct reading here is to put a timing light on the bike and see if the timing advances and retards with blips of the throttle.
What problem are you having with the bike?
regards robotek

Posted on May 02, 2010

  • 1 more comment 
  • Graeme Ross
    Graeme Ross May 02, 2010

    Adding a little more to the story....


    The vacuum advance should continue to hold vacuum. It is common for these to fail, where the unit leaks,and will not hold the vacuum sufficiently for the unit to work correctly. This part is now no longer available from Honda, but the bike will run ok so long as vacuum takeoff from the carb is blocked off, to prevent air bleed into the intake manifold leaning out that cylinder.
    regards
    robotek

  • Graeme Ross
    Graeme Ross May 03, 2010

    It may be a few things causing the problem.


    • I would be checking the way the timing varies with a timing light. The advance you may be witnessing is the mechanical advance/****** kicking in. The vacuum advance may not be working at all, or stuck with timing too far advanced.

    • check that you are not running lean in the low speed circuit on one or more carbs... does it still knock with the choke on? Also make sure that sync is good.

    you really need to check timing with a timing light to see what is happening. I DO suspect the vacuum advance is faulty.


    regards
    robotek

  • Graeme Ross
    Graeme Ross May 03, 2010

    oh....and i do not suspect that there is a problem with the vacuum from carby being blocked. If it is a carby problem, expect the air/fuel mix slow speed side of things to be causing it to run lean. Check for vacuum leaks about the carby that the vacuum take is. spray carby cleaner about the intake manifold and throttle plate shaft bushes for air leaks leaning it out, or to a degree reducing vacuum... though it would not be enough to cause the problem you have.

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