Yes! The motor says its 12.5 hp but that's b.s it's the exact same thing as an 11hp Briggs and Stratton, cept they have a different style carb
The torque sequence for a single cylinder Briggs and Stratton engine horizontal shaft head is increments of 2's for hp and 1's for head bolts. That makes 11 head bolts for an 18 hp.
Most likely 3/4" diameter, though it's possible it's 5/8". Although, I have never even once heard of a 3.5 hp mower with a horizontal shaft.
It turns clockwise.
On most of those engines it is 1in" But it could also be 7/8"
how to Change oil on a Briggs and Stratton 6.75 HP
Clean the carburetor with special attention to the high speed jet and fuel passage.
12.5 hp Briggs And Stratton blows fuse when u crank it
220 in-lbs
Your flywheel key might be sheared
Roughly 16.5 HP
Turn the flywheel to BDC (bottom dead center) as you continue to turn the flywheel into the combustion stroke, it will be the first valve to move.