If it only runs with the choke cuttin' off your intake air, you have one of two problems. Either the carb can't supply enough fuel to mix with unrestricted inlet air, or you have air leaking in after the fuel is introduced at the carb.
Can't hurt to check the carb to manifold and manifold to head connections to make sure they're tight. It's so easy and takwes so little time, I'd do it first. A mechanical check should be good, but you could follow up by spraying a little carb cleaner around those connections with the engine running. If she speeds up in response, you've got some more tightening to do or might need to replace the gaskets.
Where you've been at the fuel bowl, though, I suspect more strongly the fuel supply is at the root of your problem. Start at the top and work your way down. Get rid of any clutter and stuff in the tank that might cover the inlet to the sediment bowl. With the valve in the open position, blow out all the passages on the sediment bowl and clean the screen. Blow out the line from the bowl to the carb. Pull the inlet elbow into the carb, the one the fuel line attaches to. It should have a very fine cylindrical screen on the carb end. Flush and blow that out.
Beyond that point, you'll need to have a carb rebuild kit in hand. You'll likely need it for the bowl gasket anyway, and your problem may very well be with the float needle, which is in the kit, too. Clean things up and blow them out while you're into it, paying spceial attentino to the critical passage that the float needle closes off and check your float level.
There's other things you can do/check/replace while you have the carb apart, but those basic things ought to get you running reasonably strong.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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