Practice question

What is the significance of the heat range rating of a motorcycle spark plug?

It defines the maximum ambient weather temperature the plug can withstand
It measures the temperature of the spark itself during discharge
It refers to the plug's ability to transfer heat away from the firing tip into the cylinder head
It determines the timing advance of the ignition coil

Answer: C — It refers to the plug's ability to transfer heat away from the firing tip into the cylinder head

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