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Tecumseh provides dealers with a 0.012" air gap guage, but 0.010 - 0.014" will do.
Set the spark plug gap to .030"(.762mm).
The plug gap for a 5.5 hp Tecumseh is .030 in.
.030 inch ( on my 24 year old 5.0 horsepower Tecumseh engine )
This is a Tecumseh engine. According to the Tecumseh web site all small engines have a 0.030 gap
Champion RN4C - Gap .030"
Tecumseh website, "All spark plugs air gap is .030."
Use a Champion RJ19LM set to a 0.030" gap.
go to B&S site they have all gap setting for every engine they have made.
.030 in. or .076 mm gap
The gap should be about .0125 in. (.3175 mm.) or the thickness of heavy paper.
The Answer to your question RJ19LM spark plug set at 20 thousand of an inch.