Reply To: Sparkplug Neptune 15B2

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August 3, 2024 at 8:16 am #289593
GARY
Participant

    US Member

    Well,Champion was making a”J63” plug in 1920,before Johnson started outboard production.It was a 18mm plug,semi aircraft style and was early motorcycle plug.The AC regular metric version was the Johnson factory installed plug in the early A models.