What is the air gap setting on a coil for a 19 H.P. Kohler engine?

Need the air gap setting for a Kohler 19 H.P. motor on my lawn tractor.|||turn the flywheel till the coil and the steel plate line up then slide in a business card and let the magnet pull the coil up tight . tighten up the bolts and remove the business card. works good every time.|||It's often stamped on the coil itself, and is probably 0.010", but will, according to the service manual, have a tolerance and be okay at 0.008 - 0.012".