Yes you can buy/change heat ranges of plugs. But, depending on on how and time of year you run the engine, you could cause problems or even burn a piston. The manufacture's install/sell a "general heat range" that cover all temperatures/areas/waters. Sense they don't really know where the engine will be used. yada yada yada.
So, if your plugs are fouling, you could go to a hotter range and see if that helps. ( As long as your fuel delivery system is working correctly) If you idle more you would want a hotter range. If you do alot of WOT (wide open throttle) you want a colder heat range plug. If that makes sense. There is a large heat range most plugs are available in. To cover all conditions. Going 2 heat ranges away from stock, would be a bad idea unless you know what you are doing.
Which spark plugs are the best?
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