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The TSX-241 series is a TSX-33 with a "back suction economizer" added. The float bowl is sealed and there is an extra drilled passage including a threaded jet connecting the throttle plate area to the float bowl. The 241a, 241b, 241c designations refer to a series of minor internal changes off the TSX-241 base attempting to improve the off-idle throttle transfer characteristics of the carburetor. The needle/seat, gaskets, choke plate, throttle plate, idle needle, venturi, float, and throttle packing are the same in all of them. The jets may be different between the different models. The TSX-241 has an economizer jet not used in the TSX-33. One generic rebuild kit works for all of them. In fact, any of the carbs will work on any of the engines. If your carb kit includes jets, there is probably an excess of them. You will have to choose the ones corresponding to what is in your carb now. You can use a numbered drill bit set to do this. You can probably just eyeball it if you have to. I believe the TSX-33 carb is correct for the 39-41 9N. I'm not sure exactly when the TSX-241 began to be used in the 2N/8N.
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