Engine Dieseling - Options?

fuel level was a little high, adjusted down just under mid way of sight glass, carb has the vent diverter shields stock - carb gasket is about an 1/8-3/16 thick fiber gasket, 4 hole type

engine temp holds steady at 180/185ish on autometer gauge, stock gauge temp below 1/2 way mark, of course hottest day when running was probably high 60s at best