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.030
My book for my John Deere snowblower , which has a 5 horsepower Tecumseh engine , shows to use the Champion RJ17LM spark plug
J19lm
The correct spark plug for a 5 hp. Tecumsen 4-cycle motor is Champion J-8 (RJ17LM). The plug gap is 0.030 in. (0.76 mm)
Per Champion spark plug applications chart, the gap for 6hp Tecumseh engine is .030
According to my owners manuel the spark plug gap is 30
Set the spark plug gap to .030"(.762mm).
An Autolite 258 is the recommended spark plug for a 6. 5 horsepower Tecumseh engine. A Champion RJ19LM also is recommended by the manufacturer.
.030"
rj8 is used for a 7hp Tecumseh that powers a 22" yardman snowthrower
Call any auto or small engine repair shop they will have books on that info!
Champion J8C