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Champion J8C
Rj19lm
Autolite 258
An Autolite 258 is the recommended spark plug for a 6. 5 horsepower Tecumseh engine. A Champion RJ19LM also is recommended by the manufacturer.
Champion RN4C - Gap .030"
Use a Champion RJ19LM set to a 0.030" gap.
Spark plugs use SAE and not Metric. The one that fits it is the one that fits it.
18MM
5/8"
what plug size fits a 3.75 briggs and stratton,and a 19.5 briggs engine and what is the gap. thank you
18 mm
Most commonly a 13/16", but a 3/4" is possible.