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Neill "M": I'll back up what Harry is telling you about the carburetor. I'm working on a Model 149 that when I got it had so much fuel flowing that I couldn't keep the tank full. After replacing the clear plastic lines with rubber ones, and adding an in-line filter, the fuel's "free flow" abated, but the gas still seemed to disappear from the tank when sitting. However, the tractor would start and run until recently. 

 

In an effort to diagnose the problem I tried starting fluid. It would fire with the ether and run a little while, but I couldn't get it to stay running on the gas. 

 

I've now had the carburetor apart only to find problems with the float --one of the tabs was missing altogether, allowing the float to hit the bottom of the bowl, and possibly get hung up. The carb also probably had some trash in it as well (I've cleaned it). I'm waiting for a break in the weather to re-install and I'll let you know if it works.

 

Bottom line: As Harry points out, fuel flow TO the carb doesn't necessarily mean fuel flow THROUGH the carb.

 

Another possibility: If you've gotten water in the gas, and it is very cold where you live, its possible the carb is "frozen" even if the fuel flows. 

 

I hope you get it worked out. I feel certain that once you get it running, the Cub will ride, handle, and perform better than the OT tractor you mentioned.

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