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Carburetor has foreign matter in it that doesn't belong there. Pointing it down hill may have caused a small puddle of water that was just sittig there in the sump{that is supposed to drained from time to time} to migrate to the high speed orifice area. Cleaning the N carburator. The problem may well be the presence of moisture in one or more places in the fuel system. Water likes to go to the bottom of gasoline and the bottom of the system is at the bottom of the carburetor. The best thing to do is to take the carburator off and take it inside the shop and then take it apart. Remove the big high speed jet needle from the front of the carburetor first or it will be damaged when the carburetor is split. It will be facing down and angled to the back slightly. There are three screens in the N fuel system and all of them must be open so fuel can flow. The first is in the tank on the top of the fuel valve/bowl. The second is in the top of the fuel bowl. The third is in the elbow that attaches to the carburetor where the fuel enters the carburetor. To see if you have enough fuel flow to allow the engine to operate right you should open the carburetor drain plug that is the small 1/8” pipe plug in the bottom of the carburetor bowl and allow it to drain for at least a full minute. There should still be a good flow of fuel after the one minute is up and not just diminish to a drip. Be very cautious about the gas in a closed area and have no source of ignition so you don't set yourself of fire with the gas. The bottom of the bowl needs to be cleaned good and then blown out with compressed air. If you have the right tool to do it you need to remove the high speed fuel nozzle. That is the brass thing in the venturi (throat) of the intake that is pointing down and toward the front. It takes a long socket of the right size and don't try to get it out with a pair of pliers or you may get it so it can never be removed and cleaned. There will be several little holes in the jet that come into the bore from the sides and they all need to be opened with a needle of the right size. The best thing to use is a welders tip cleaner as it will have an assortment of different sizes and one will fit. Always use the biggest one you can get to go into the hole, Be absolutely sure that the orifice in the bottom of the carburetor just below the point that the high speed needles sits when assembled is absolutely clean and free of all foreign material.
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