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Which is a colder spark plug for harley-- 5R6A or RN12YC?

The 5R6A spark plug is colder than the RN12YC spark plug. This is because the 5R6A spark plug has a longer insulator nose which helps to dissipate heat away from the spark plug tip. The RN12YC spark plug has a shorter insulator nose which means that it will transfer more heat back into the engine head compared to the 5R6A spark plug.
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