Re: Good solid runner till the other day...
Blow the coil area out with compressed air or spray with WD-40. take the plug out and turn the engine over to clear the cylinder. then attach the plug to the plug lead and lay the plug on the cylinder and turn the motor over and check for spark. If you get spark, install the plug and spray small amount of starting fluid in carb (not filter) turn motor over should at least fire a second or two. Then its a fuel issue.
Hope this helps!