Discussion in 'Motorbike Technical Discussion' started by Gristle, Dec 21, 2006.

  1. Gristle

    Gristle Guest

    My son crossthreaded the sparkplug into the cylinder head. Is there a
    sparkplug repair kit available or will I have to re-tap and insert a
    helo coil? Can I do this without removing the cylinder head?
    Gristle, Dec 21, 2006
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  2. Time-sert and Heli-coil both make repair kits. I guess you might
    be able to chase the threads with the right size tap. Seems like
    pulling the head might be a good idea if you could figure out
    how to get the valve timing right when you reassembled it.

    Wonder if you could thread a tap or an extra long plug in from the
    inside out to clean the threads ?

    Rob Kleinschmidt, Dec 21, 2006
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  3. First try running a tap down the thread.

    In theory, you ought to remove the head. In practice, you *can* fit a
    thread repair with the head in situ if you're damn careful. A friend
    did it a while back. Once the job was done, he attached a pipe to a
    vacuum cleaner hose with a load of gaffa tape, and stuck it down the
    plughole to suck up any swarf that might have fallen in.

    The bike worked perfectly afterwards.
    chateau.murray, Dec 21, 2006
  4. Gristle

    GaZ Guest

    You can fill the chamber with oiled cotton string. When this is fished out
    most of the bits will be stuck to it. Set the cylinder on compression stroke
    so that both valves are closed. A good squirt with an air line too.
    GaZ, Dec 29, 2006
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