Quote:
Originally Posted by askmrjesus
...If you've added a complete exhaust system, you may want to drop a couple of heat ranges to keep head temp down, but other than that- it's a spark plug- as long as a spark comes out one end, you're good....
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Spark plug heat ranges have almost no effect on the actual combustion temperatures unless the plug causes preignition or incomplete combustion.
You should use whatever plug is recommended by the OEM since fuel injected engines can control the A/F ratio in a much narrower range than a carb.