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I suspect the push rod for your throttle isn't pushing the throttle lever down on the carb. When you move the lever up on the handle bar then it should move the lever down on the carb. The push rod my be bent, broke or rusted in place.
Sounds like your carb needs the fuel/air mix adjusted..uses all the gas at high speed but has excess at low speeds...find your adjusting screw and at med throttle slowly screw it clockwise until the engine starts to sputter then back it out until it starts to sputter again then continue to do this until you reach ideal mix where it runs the best it can..then go slowly through the throttle up and down..when set..unjust your idle speed screw to your ideal idle speed..if this dies not fix ..carb will bed cleaned or rebuilt. Good luck.. Note always push or pull your throttle handle slowly to position avoids gas load up causing sputter and backfire.
Normally when you move the throttle control on the handle, all that is happening is that governor spring tension is increasing or decreasing pull on the linkage /governor arm. With engine off and plug wire removed, look for a small shaft coming out of the engine with an arm attached. Attached to the small arm will be linkage to the throttle on carb.. So when you move the throttle on the carb with your finger the arm moves also. There should be spring connected to opposite side of governor arm connected to throttle control at the handle or small lever or metal tab. When you incease pull on the spring, the engine will speed-up. Adjust as needed. Good luck
Check the governer, its a lever that pulls the throttle plate from the engine side. Try manually overriding it (twist it open as the engine's running) and see if that does it.
One possible cause for this problem is debris,sticking,or frozen linkage between the governor and the throttle butterfly. Depending on the make and model of your engine it will either be a mechanical governor that has a arm that goes down into the case or a air vane governor that is behind the recoil shroud of the engine. Move all the linkage that connects between the governor and throttle and speed lever to make sure it doesn't bind or sticks. If it does pray a little silicone or wd 40 spray on it to help reduce friction. Also on air vane governors they can become stuck from debris that inhibits it from moving make sure there is nothing in the way of the governor. If all of the linkage is working properly and you still have the issue try adjusting the the fuel mix screws and the high rev. settings on the throttle lever (if equip.).
Spring goes from throttle air valve to plastic lever under flywheel. Cooling fan on flywheel provides pressure to open/close throttle. As engine (fan) speeds up, pressure on lever causes throttle to close. As engine slows, throttle will open. System achieves an equilibrium very quickly.
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