Use a Champion RJ19LM set to a 0.030" gap.
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Champion J8C
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"
Chanpion RJ19LM
Rj19lm
what is the champion cross reference for a briggs and stratton spark plug 691043
Spark plugs use SAE and not Metric. The one that fits it is the one that fits it.
Spark plugs are hidden under the plastic engine cover. You have to remove the ignition module as well which fits over the four spark plugs.
what plug size fits a 3.75 briggs and stratton,and a 19.5 briggs engine and what is the gap. thank you
I was unable to locate the number you specified. Tecumseh typically used an engine number and a spec number. As for what it fits, that is impossible to answer. Typically engines are customized by the manufacturer to fit the application. So, if you can bolt it on and the output shaft can be adapted to your application, it fits. Sounds like a smart alec answer but it is truly the best answer you will find.