Join Date: Jun 2018
Location: Hutchinson, KS, USA.
There is not enough info to diagnose your problem.
There is probably spark. But...
It could be fuel/air mixture (carburetor) which is the easiest fix. You will have to take the carbs off and poke the gunk out of the carb jets
Or it could be compression. (cylinders/pistons; and/or piston rings, rods or bearings)... How does the oil look? Any metal in the oil, filter, or screen?