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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
Use a Champion RJ19LM set to a 0.030" gap.
Rj19lm
.030
Set the spark plug gap to .030"(.762mm).
My book for my John Deere snowblower , which has a 5 horsepower Tecumseh engine , shows to use the Champion RJ17LM spark plug
.030 inch ( on my 24 year old 5.0 horsepower Tecumseh engine )
J19lm