Go buy a can of carb cleaner, take off the float bowl and shoot it through every passage you see.The passages are very small and it doesnt take much dirt or varnish to clog them up. Buy some Rolaids also because what you see whats in the bottom of the float bowl might make you sick :scream: Carb work is simple if you understand how they work.Air rushing by draws fuel from the float bowl up through small precise passages.If the passage is clogged no fuel is supplied to the engine.This is a cheap check and might not be your engines problem but carb cleaner costs 3.00 Good luck By the way you have to hold the throttle open while turning the idle adjust screw in because the idle screw just holds the slide up.