It is probably a Briggs & Stratton engine. You will need to supply the model number from the engine to get a correct gap.
.030 is the correct gap.
.030"
The correct gap for the spark plug of a Briggs and Stratton 6.75 Lawnmower engine 0.030. Most new plugs come with that gap, but it is best to check to make sure.
The spark plug should be gaped at .030"(76mm)
You will need to get the spark plug from the manufacturer. You can find out this information by calling them or looking through the users manual.
0.35
normaly it,s a short base, hot burning plug,
The correct plug gap for my Toro GTS 6.5 horse mower is 0.035
You may do serious damage to the lawnmower if the wrong spark plug is installed.
I set mine at 35 thousands,
35 thousands, of an inch, if its a short base plug , 60 thousands, if its a long base plug,
Per Champion spark plug applications chart, the gap for 6hp Tecumseh engine is .030