.30
My book for my John Deere snowblower , which has a 5 horsepower Tecumseh engine , shows to use the Champion RJ17LM spark plug
If that is a 5 horsepower Tecumseh engine - ( .030 inch )
Chanpion RJ19LM
Champion J8C
Rj19lm
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Autolite 258
Use this link-http://manddsmallengine.com/tecumseh/info/plug2.html
An Autolite 258 is the recommended spark plug for a 6. 5 horsepower Tecumseh engine. A Champion RJ19LM also is recommended by the manufacturer.
what is correct spark plug gap for aeriens 624E snowblower
Champion RN4C - Gap .030"