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Spark Plug Thread Repair kit

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  • Spark Plug Thread Repair kit

    The tap gradually cuts the 14mm thread, slightly wider so that the thread is cleaned up, and you can fit the machined aluminium insert into the spark plug hole. If you have a cross threaded 14mm x 1.25mm spark plug in an Aluminium head, then this is the perfect little kit to rectify it.

    These look like an alternative to the Helicoil and possibly a cheaper and easier to fit option. I did ask the seller about how the insert is fitted (no insertion tool is included) but it seem you just tap out the old hole with the tap provided and screw in the insert in with a spark plug with a drop of Locktite. Kits are available for 8mm 10mm 12mm & 14mm plugs

  • #2
    I had one of these (fitted by a previous owner) blow out of the cylinder head on my Silverstone rep on the run down to Cascades (as was) at Oulton Park. That was in practice and fortunately I had a spare 'head with me so I still got out to race.
    Colin Sparrow

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