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XJ750MK Chirpping bird...

Discussion in 'XJ Technical Chat' started by meaton03, Sep 27, 2007.

  1. meaton03

    meaton03 New Member

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    Hey Guys and Gals,

    This is my first post and hoping to find some help with my '83 Midnight Maxim. I love the bike and plan on refurbishing this off season. (Hard to ride in Chicago Dec - Feb).

    My little cruiser has started a chirpping sound. It is not all the time. It happens mostly when I start it. But it also happens after it has been running. It does NOT get worse if I rev the engine. It sounds like it is going around and around (if that makes sense)...Like something spinning is hitting it every so often.

    Like I said it does not do it all the time but when it does it is prominent.

    If anyone could offer a possible fix, I would greatly appreciate it.

    Be safe out there.
     
    meaton03, Sep 27, 2007
    #1
  2. Robert

    Robert Active Member

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    Welcome Mark! Did you happen to note whereabouts on the engine this sound is eminating from? Top end, transmission, final drive? I have a funny sound like the one you describe that sounds like a knock when my bike idles too low. I wonder if this is the same issue.
     
    Robert, Sep 28, 2007
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  3. Maan

    Maan Member

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    Most likely a Knock :oops:

    I learnt the hard way when i kept on running it & when went into fix it, found the 4th cyl bearings on top of each other, It actually had Spun.
     
    Maan, Sep 28, 2007
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  4. meaton03

    meaton03 New Member

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    Ok I rode it just a bit last Friday. It does speed up when I accelerate. I can not really tell where it is coming from. Somtimes it seems out of the primary cover, other times out of the engine compartment.

    Ok so if it is a knock what is the fix? I was planing on tearing the bike down this winter anyway but I wanted to wait until out Toys for Tots run first week of December. If I have to do it now I will.

    So any tips. I am not a mechanic by anymeans but I am mechanically inclined and can get around things with some intstruction and guidance. I do have the manual for the bike as well.
     
    meaton03, Oct 1, 2007
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  5. MiCarl

    MiCarl Active Member

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    Knock is way different than a chirp.

    Knock is something with too much clearance banging (crank against rod bearing or rod itself).

    Chirp is something rubbing - or a vacuum leak.

    Get yourself a piece of fuel line about 4 feet long. Hold one end to your ear - probe with the other end. Find the noise. Make sure to listen to all 4 intake manifolds and the fuel valve.
     
    MiCarl, Oct 1, 2007
    #5

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