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I understand that one should goto a colder spark plug if the current ones are running too hot, but how do i tell if it is too hot? Surely it cant be as simple as just the temperature that the engine runs at? Which is affected by the cooling system!
Mine has a 4 core rad, no heater matrix, is a 1380 and runs always below the white temperature marker, which suggests the engine itself is cool enough, if indeed the spark plug temperature is in relation to the engine temperature
Is it just trial and error? Should i get some 7's? Currently using 6's