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rj8 is used for a 7hp Tecumseh that powers a 22" yardman snowthrower
Correct sparkplug is Champion RN14YC
.030
.030"
Replace one at a time.
My book for my John Deere snowblower , which has a 5 horsepower Tecumseh engine , shows to use the Champion RJ17LM spark plug
J19lm
According to my owners manuel the spark plug gap is 30
I have used a Champion RJ19LM or J19LM, both work fine.
Call any auto or small engine repair shop they will have books on that info!
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