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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.
Even though an Intek is not shown, it would be the YouTube video below.
scotts intek 6.5 starter cord replace
SAE 30
0.030
For a Briggs & Stratton Intek engine "PH8170"
0.030"
Try this site: http://outdoorpowerinfo.com/repairs/
It needs at least 70 psi to run.
48 oz oil capacity
try .030 unless it is an Intek OHV and then 0.020"
In many product descriptions I'm seeing 8.5tp engines as replacements for 5.5hp engines.