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Cold starting sound

Discussion in 'XJ Technical Chat' started by yrnomad, Nov 19, 2008.

  1. yrnomad

    yrnomad New Member

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    Location:
    Vancouver, WA
    I've got an '82 xj750 (touring style with the factory fairing) with 30k miles on it. The last month or so, I've had a noise like a metalic hum, almost like a ringing or horn sound right when it turns over after sitting at least a few hours. It lasts maybe 2 seconds and is gone. The bike does start, but I'm worried something might be rubbing that shouldn't.
    I've got to tear down the carbs this winter, so I'm wondering if there is something else lurking inside that needs attention.
    Any ideas?
     
    yrnomad, Nov 19, 2008
    #1
  2. MiCarl

    MiCarl Active Member

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    The sound you hear is the engine pushing the starter.

    When the oil is cold (thick) the starter clutch is slow to disengage. You might want to go to a 10w30 for winter if you have something heavier in there.

    My 650 did the same thing.
     
    MiCarl, Nov 19, 2008
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  3. asphaltgecko

    asphaltgecko Member

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    I had that exact same bizaare noise !!! trust me , as youve seen its VERY hard to describe ! LOL

    it has almost completly gone away with 3 things i did,

    1. added weather stripping between radiator and radiator cover sides.
    2. did complete crancase cleanout ( filled with disel fuel and let sit over night then drained it all out and did it agian over night, drained it and then
    replaced it with new oil, ran engine for about 3 mins, drained oil agian
    and replaced with new...
    man what a difference ... that engine is smooth as a sewing machine now..

    3. had carb boots all replaced, several were cracked and whistling...


    now that weird metal hum noise is almost completly gone at cold start and is all gone at warmed up...

    i think the other guy was right it has something to do with clutch mechanisim but not sure what part...
     
    asphaltgecko, Nov 20, 2008
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  4. kd5uzz

    kd5uzz Member

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    FILLED up with fuel, or used the same volume as an oil change?
     
    kd5uzz, Nov 20, 2008
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  5. Ass.Fault

    Ass.Fault Active Member

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    im in the same boat, sounds like ringing yet its not to cold here
    well, im off to change that pesky oil
     
    Ass.Fault, Nov 20, 2008
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  6. yrnomad

    yrnomad New Member

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    MiCarl
    Ah, good idea, I've been running straight 30weight.

    asphaltgecko
    How long did you run the bike with the diesel in it?

    Thanks everyone, sorry it took me a while to get back in here.
     
    yrnomad, Nov 26, 2008
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  7. Galamb

    Galamb Member

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    I don't think he would run the bike with diesel in it, instead of oil. Running straight 30 weight is too heavy in the winter time.
     
    Galamb, Nov 26, 2008
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