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The water neck fitting attaches to the "main suspension fork", not the drive !
I fully agree… this is a very likely suspect.
Yes. With NGK the lower the number the hotter the plug.
From the NGK site
My generator is a Kohler Model 7.5A27; Serial number 490638 at 1800 RPM. The volts drop down to 900 or below when hot water heater , stove or AC is on,
Have u tried saltaway, Has compression check been done?? Compression gases in cooling system causing cooling issues!!
New problem? Old problem? How old plugs and wires?