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Chanpion RJ19LM
Champion J8C
Rj19lm
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Autolite 258
An Autolite 258 is the recommended spark plug for a 6. 5 horsepower Tecumseh engine. A Champion RJ19LM also is recommended by the manufacturer.
Champion RN4C - Gap .030"
Use a Champion RJ19LM set to a 0.030" gap.
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)
Most commonly a 13/16", but a 3/4" is possible.
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