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spark plugs

if you use the denso be sure to use the a/c copper washers. I had some come loose using the washers that came with them, cylinders ran so hot the valve seats came loose. Never had a problem with any other plug. Also the Denso seems to resist rust better.
NGK makes a "W" series plug that's 18mm, they work great in old snowmobile and farm tractor engines, and wouldn't be a bit surprised with excellent results in other applications. The higher the number, the colder the plug, "9" are used in two stroke snowmobile engines running WOT most of the time.