normaly it,s a short base, hot burning plug,
I set mine at 35 thousands,
The spark plug gap for a Murray 3.5 horsepower lawn mower should be set at .030 inches. A new spark plug will come with the gap preset and should need no further adjusting.
the spark plug gap is .025"
.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
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.
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