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Idling issue

Discussion in 'XJ Technical Chat' started by cappy1983, Nov 22, 2012.

  1. cappy1983

    cappy1983 New Member

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    Hi Guys,
    New guy here. I just picked up an 82 maxim 550 a couple of weeks ago and i have an issue with it. The bike didn't run when i picked it up so i cleaned the carbs, cleaned the gas tank, new fuel filter, new plugs and now it starts up almost effortlessly and sounds pretty good. Only issue i am having is it only idles with the choke. It doesn't idle too high, about 2000 rpm and even stays running at half choke. Revs up fine also. But as soon as i take off the choke it dies. Could this be a vacuum leak? Any other ideas?

    Thanks
     
    cappy1983, Nov 22, 2012
    #1
  2. MN-Maxims

    MN-Maxims St. Paul Minnesota

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    Check for vacuum leaks with raw propane around those carb manifolds. If the rpms pick up you have a leak.

    MN
     
    MN-Maxims, Nov 22, 2012
    #2
  3. tabaka45

    tabaka45 Well-Known Member

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    I assume that you tried adjusting the idle with the idle adjusting screw (the big knob between the # 2 and #3 carbs. If so and you find no vacuum leaks then I would pull the carbs and go over the pilot system again. When you check for leaks be sure to check for leaks around the intake boot gaskets--that's where mine was.
     
    tabaka45, Nov 23, 2012
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  4. cappy1983

    cappy1983 New Member

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    I couldn't check for vac leaks today because i didn't have any propane, tomorrow i will do this. I did mess around with the idle screw but what RPM should it idle at both on and off choke?
     
    cappy1983, Nov 23, 2012
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  5. sega_saturn

    sega_saturn New Member

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    I used WD40 to check for leaks on my bike!
     
    sega_saturn, Nov 23, 2012
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  6. maverickbr77

    maverickbr77 Member

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    Idle should be 1050 (or there abouts). Idle on choke is irrelevant and variable.
     
    maverickbr77, Nov 23, 2012
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  7. Bjarvis

    Bjarvis Member

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    Idle should be at 1050 plus or minus 50 rpm ( off choke)
     
    Bjarvis, Nov 23, 2012
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  8. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    NO it shouldn't.

    It's a 550. Idle speed for the 550s is 1200 RPM.

    There's more to cleaning the carbs than just cleaning the carbs.

    You need to accurately wet-set the float levels, and do a good bench sync.

    Then once your VALVE CLEARANCES are in spec, you'll need to do a running vacuum sync with the YICS blocked.

    Until you do it won't idle right or respond to throttle correctly, no matter how much you fiddle with adjustments. The Mikunis reward precision.
     
    bigfitz52, Nov 24, 2012
    #8

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