More Zenoah help wanted?

Hi all, I've recently acquired a Kalt/Zenoah G22, engine is fitted with NGK BPMR7A plug but with 2 washers fitted, I removed 1 washer but now plug fouls piston so I assume this isn't right plug! Anyone know what correct plug should be?

Regards Paul

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Probably a B7 instead of a BP7. The P means a projected center electrode.

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Paul McIntosh

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