On Tue, 12 Jan 2016 12:04:14 -0700, Don Y
wrote:

A friend is having trouble with a small (5-7HP) engine.
Not starting. Aside from checking for spark (after
ensuring no "old" fuel present), I can't think of any
easy tests that he can perform...?

Squirt a little gas right into the carb throat and see if it runs a
few seconds