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I have a 1999 mariner 9.9 and the sparkplug gap is 1.5mm (0.06in) according to the owners guide. It says to use spark plug NGK-r plugs partt#BPZ8HS.

I couldn't find those and was told to get champion marine plugs L78YC6 and got those. Havent gotten a chance to try them yet though. hope that helps!

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13y ago

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