Is anyone familiar with this dual plug cylinder head?

Started by 61rover, February 15, 2024, 04:12:32 PM

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61rover

Came on a 175 motor I purchased.  Were these common?

John Crouse
74.5 Jackpiner 175

Doug Knight

Spare plug or for a compression release. I have a 125 Six-days that had one.

61rover

John Crouse
74.5 Jackpiner 175