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I'd guess 13/16" if the sparkplug is a NGK B8ES or Denso W24ESU(could be wrong). Some bikes take a 5/8" socket for the smaller plugs.
 

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Zephyr 550 plug is NGK DR9EA Which is 18mm in the UK.

Where that comes out in old money is gonna be about 3/4" Sorta
 
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