Best spark plug????
I run a J17LM in my Jiffy model 30. The difference between plugs are= The R is a resistor style plug=only for radio interference which they want you to run in Canada. In the USA i use a NON-Resistor plug. The J17LM plug runs Colder then a J19LM plug. that is the difference. A spark plug is designed to remove heat from the engine like.
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