Hi Norm,

I had a look at a 10 /11 hp briggs and the stator bolt is the same as the bolt that holds the coil.

I don't have a thread gauge that goes that fine ,best guess is it's 5/32 bolt 32 TPI
and (1 inch long measured under the head to end)

Usually if I'm not 100 percent sure I'd buy a bolt that size and try it and if it's right
buy the tap.

Cheers
Max.