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The TSX-241B has sealed float bowl and a "back suction economizer". The TSX-33 has a float bowl open to the intake horn and no economizer. The back suction economizer leans out the mixture under conditions of light load and high manifold vacuum. In theory, this saves fuel as the thrify farms putts about from one field to the next. It has no effect on full power output or on operation at idle. In practice, the economizer can result in objectionable hesitation as the throttle is rapidly advanced, and can interfere with smooth idle, particularly if the idle speed is set higher than 400 RPM. The feature can be, and often is, entirely defeated by cranking out the main mixture screw in an attempt to cure the hesitation. As Marvel-Schebeler went from the 241A to B to C, they were changing the economizer passages and jets to try to find the right balance -- the feature never quite worked optimally. Some folks incorrectly call the "main fuel limiting" jet at the bottom of the fuel bowl the "economizer jet". Perhaps this is because that big screw on the top of the carb does have a large impact on the amount of fuel the tractor uses, particularly at high power. But the economizer jet in the TSX-241 is mounted higher up, meters air and not fuel, and serves to limit the amount of manifold vacuum the float bowl is subjected to, and thus the amount of "back suction". Your tractor will not be "hurt" by the TSX-33. It is a slightly simpler carburetor with one less thing to go wrong.
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