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From what I can find the L8C is the equivalent of a NGK B6HS or Champion L82C.
From a motorized bicycle forum "NGK-BR6HS is the most widely used replacement plug for the Chinese crappy Z4C and the Z8C S/Ps."
I'd swing by Lowes or Tractor supply with the one you have and compare it to what they offer in the small engine department.
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Nick
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