Can anyone tell me what size the thread is in the cylinder head spark plug hole ? I have seen two sizes quoted 10mm & 12mm and I don't know which , if either of them is correct.
Can anyone tell me what size the thread is in the cylinder head spark plug hole ? I have seen two sizes quoted 10mm & 12mm and I don't know which , if either of them is correct.
Thanks for the helpful reply across the thousands of miles to Perthshire Scotland
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