Hotter spark plug?

[beckoning]

My 2009 Merc 9.9 4-stroke is used only as a trolling motor, mostly at very low rpm, 800-1100 rpm. I motor out onto Lake Michigan using the 100hp, turn off the 100hp, then fire up the 9.9 to troll at 800-1100 rpm for 2-3 hours. Fouling spark plugs is a common occurrence. Would a hotter spark plug help stop the problem of fouling plugs? It doesn't burn oil, and all other systems seem to work fine. Sometimes, after 2-3 hours, it starts running on one cylinder. Using NGK standard 14mm plugs. Would like to try a hotter plug to help burn up more of the gas-air mixture at combustion. Suggestions?

 

[Texasmark]

Check out your other site posting.....answered you there. Had I pulled up this site first I would have answered it here.

 

[beckoning]

Thanks.

 

[racerone]

Beckoning.----What do you understand a " hotter plug " to be ???-------What is the idea of a hotter plug do you think ?