What is the spark plug gap for a Yardman Model# 11A-549R729 332-839 Briggs & Stratton engine?

I have a Yardman 21" mulching lawn mower model # 11A-549R729 332-839 with a Briggs & Stratton engine. I have the model 549 owners manual in pdf format but can not find the information regarding the measurement for the spark plug gap.