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My escaping spark plugs..

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    #1

    My escaping spark plugs..

    My plugs are working themselves free (at least to the point of compression leaks) and quickly, in less than a half hour of engine power... the holes don't feel stripped, and I have been cranking them in about 1/4-1/3 turn past *tight* as it is..

    I'm now carrying a socket wrench set with me at all times, for as soon as I turn the bike off I'm having to readjust them if I ever hope to get moving again... *hard to start out in first with compression leaks in 2-3 of 4 cylinders*

    what should I do? how can I keep these slippery b@st@rds in place?

    --

    btw, if looking from left to right, cylinders numbered 1243, cylinders 124 are slipping... I tested compression in 4 & 3, but got distracted by housework before I finished... they were both at something like 135-150psi.
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    #2
    Try and get some new crush gaskets for each one and use a torque wrench when installing. Other than that I suppose just a dab of BLUE locktite on the threads would work.

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      #3
      loctite

      I don't now if Loctite would do any good that close to the heat....Mike

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        #4
        Does the bike vibrate badly? If threads are stripped, it can blow a plug out, but compression does not distribute any rotational force to a plug.
        Compression force PLUS vibration would cause them to loosen and turn out.

        Earl
        Komorebi-The light filtering through the trees.

        I would rather sit on a pumpkin and have it all to myself than be crowded on a velvet cushion. H.D.T.

        Comment

          #5
          Do you have the right plugs?

          You might want to use a torque wrench to make sure they're at the right tightness.

          I agree that the crush gaskets might be the problem, but I've never seen it, even on plugs I've removed and reinstalled many times. Nevertheless, perhaps you could try a new set of plugs.

          If the threads on the cylinder head are worn, you could have helicoils installed. Maybe a machine shop could check the threads to make sure they're still within tolerance limit.

          If the threads are corroded or dirty, the plugs may feel like they're tight, but maybe not. Maybe some cleaning and a little oil will allow the plugs to seat tighter.

          Comment

            #6
            I've never seen plugs come loose unless there is already a helicoil or timsert (sp?) that is coming loose. If the threads were bad, the plug would be spinning by now rather than tightening. BTW, from left to right the cylinders are 1234.

            Comment

              #7
              Originally posted by Don Lobacz
              I've never seen plugs come loose unless there is already a helicoil or timsert (sp?) that is coming loose. If the threads were bad, the plug would be spinning by now rather than tightening. BTW, from left to right the cylinders are 1234.
              Just an additional note, 1243 is the firing order. bangka bangka bangka bangka

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