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Even though an Intek is not shown, it would be the YouTube video below.
Valves 21 hp Briggs and Stratton Intek V Twin can be adjusted by increasing the torque on screw band with a right rotation. This can eliminate some leaking problems.
scotts intek 6.5 starter cord replace
SAE 30
0.030
For a Briggs & Stratton Intek engine "PH8170"
120 is nominal
0.030"
Try this site: http://outdoorpowerinfo.com/repairs/
It needs at least 70 psi to run.
Intek Pro, Vanguard, and I/C engines are for heavier duty Industrial/Commercial applications. The cylinder has a cast-iron sleeve insert. Standard Intek and Powerbuilt have an aluminum cylinder wall. These are for general and consumer use. Diamond refers to a Diamond Bore cylinder, a special preparation of the cylinder for better wear and oil consumption.
I believe a straight 30 weight oil will suffice.