Cub dies at higher rpm

[bricemosher]

Hey Gang, I am new to the forum and also quite new to Cubs. I have a '47 cub, I bought it last winter and used it almost daily thru the summer with no problems. In the fall it began to have issues when running at near full throttle, it would spit and sputter and eventually stall if the throttle was not backed off. I have changed points, condenser, rotor, plugs and replaced the carburetor with a new one. Timing has been checked, The tank has been inspected, the fuel line replaced, and sediment bowl /shut off unit was removed from tank and has been thoroughly cleaned. After all this it is still having the same issue. Can someone please give me any clues on what to check next? I was debating on changing the coil,
but it does start right up and idle fine... Thanks in advance.

[Bill V in Md]

You might get more responses if you repost this question in the Farmall Cub Forum.

I would check the air cleaner. Not sure of your location, but I wonder if there could be some moisture in the fuel that could be freezing.

[Bob McCarty]

Do you check the float level (height and drop) on the new carb? Also, did you adjust the carb to governor linkage when you put on the new carb? And welcome to the Forum.

[John *.?-!.* cub owner]

Remove the p0lug from the bottom of the carb and drain dirty gasoline out of it.