Carburetor is not supplying fuel to the engine correctly. There probably is a foreign object partially plugging the metering jet inside the carburetor.
SOURCE: Yard Machine rear tine 6hp tiller that wont start.
Ok, what's happening, is your carburetor metering hole is plugged. When you place your thumb over the carb, it draws fuel through the primer circuit to feed the engine instead. What you need to do, is clamp off the fuel line, take the nut off the bottom of the carburetor bowl, and clean that nut. Look closely at it; there is a hole that goes down the center of it, and a hole that goes through it side to side towards the bottom. These make a "T" shape inside the nut. You need to make sure that these are completely clear and clean. The one at the bottom is very small, and plugs easily. You usually need a small piece of wire to clean it, such as a single strand from a wire brush. You can use carburetor cleaner to loosen it up a bit, but the important part is to clean that hole out. You also need to make sure that the float moves freely up and down while you're in there. If it sticks in the up position, it will starve fuel as well. Also look closely at the gas that came out when you did this. Was there any water in it? If so, let a bit drain out before putting it all back together.(unclamp the fuel line). Hope you have it back online soon.
Testimonial: "Nut was clogged. Now it starts but acts as it is in choke position, dont think there is a choke. Engine reves, falls, reves falls but stays going."
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