.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 )
A 10 hp Tecumseh snowblower typically uses a spark plug with the designation of either HSA or HSA-54. The specific part number can vary depending on the engine model, so it's important to check your engine's manual or the engine's specifications for the exact spark plug type. Always ensure to use the recommended spark plug gap for optimal performance.
Use this link-http://manddsmallengine.com/tecumseh/info/plug2.html
what is correct spark plug gap for aeriens 624E snowblower
.030
The spark will depend upon the type of engine being used, either 2 cycle or 4 cycle. If it is a 4 cycle, chances are the engine was produced by either Tecumseh or Briggs.
According to my owners manuel the spark plug gap is 30
Tecumseh Part #611049 - Champion Spark Plug #RCJ8Y
Tecumseh website, "All spark plugs air gap is .030."
Rape will happen.
The plug gap for a 5.5 hp Tecumseh is .030 in.