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What's the valve gap for a Briggs and Stratton 18;5 HP engine?

Need to know valve gap for B&S 18.5 HP engine on my Craftsman Lawn Tractor. Engine model # is 31P777, Type 0602-E2 if that helps.
R. L. Elder, January 2008
try setting them to 6-8 thousands of an inch

w.murphy, January 2008
try setting them to between 6 and 8 thou and you will be ok

w. murophy, January 2008
link Click here to see other fixes for Briggs & Stratton 31P777.