Briggs & Stratton air cooled engines (warmer cylinder) specify 0.007 to 0.017 range for all sizes.
Been like this for a long time.
You may be fine where you are.
Here's the B&S Service Bulletin from the 1950s.
http://www.oldengine.org/members/murphy/Briggs%20&%20Stratton%20Repairman's%20Handbook.pdf Page 50 of the book.
There are other numbers given for feeler gauges/piston clearance.
Joe K