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What is proper spark plug for a 4hp Briggs and stratton?

Champion RJ19LM spark plug is the proper spark plug for a 4hp Briggs and Stratton engine. It is a resistor-type spark plug with a heat range of 19. This means it is designed to operate in a high-temperature environment, and it will resist fouling. The RJ19LM spark plug has a 5/8-inch reach, and it is threaded 14 millimeters.