Small Engines (Lawn Mowers, etc.): 6.75 B & S motor set valves, engine model type, engine numbers

Question
How do you set the valves on motor .
Do you half to put cycler at top
thank

Answer
What is the engine model, type and code numbers?  Briggs sell several engine confugurations with a 6.75 hp rating.  You may have an OHV, L-head or Intek series engine.  I need to know the engine numbers because the different engine series call for different procedures.
Let me know.
Eric