@joekohler , Joe, remove carburetor and disassemble using rags, carb cleaner, fine copper wire strand, and compressed air, clean carb with carb cleaner out side first then inside thoroughly, probe all passages/ports etc with wire, then carb cleaner and blow out the passages. The links below 1st is your manual showing exploded veiw of your carb and parts pg 23 and 2nd link shows disassembly and cleaning. Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
http://outdoorpowerinfo.com/repairs/kohler_walbro_whg_adjustable_carb.asp
http://www.kohlerengines.com/onlinecatalog/pdf/sm_20_690_01.pdf