Originally Posted by Illegal B16
what would happen if i used a plug that was TOO cold? Nothing? What gaps do you guys use/ I use 45.
your motor might run too rich and you'll get black "sooty plugs" because the plug firing-end does not reach it's self cleaning temprature (usually between 400-450 degrees C). Mind you, it's better than running lean with a too hot of a plug, but this just shows how important it is to choose the right plug.
it can be minimzed with a good a/f tune, but bottom line is you're not getting maximum efficiency out of the motor (and the plugs will wear out faster).
My advice is to start with one step colder (NGK 7) and go from there. Also be aware, that some companies denote their temprature range differently. For example a higher number could mean hotter for one company, where as it could mean colder for another company.