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I regret that I cannot help you with plug adaptors, But like Rich, I would especially mention plug caps. Modern plug caps more often than not have resistors built into them, and are not suitable for magneto ignition. Modern plug cables may also have a high resistance. I will again especially also stress the importance of correct plug electrode gap
(ca. 0.020″ – 0.022″ (0.5 – 0.55mm). When you buy new plugs they will have a much larger gap (ca. 0.8 – 1 mm). Lodge CB-3 plugs ore its equivalent Champion 7-Com-L are regrettably no longer available.