Manco never made anything larger than a 150 engine and used the same carb as on all other 150 gy6 engines, so it will not work. Talon made by carter in the later years had a 250 and 300 but those carbs will not work either. You will need a carb with a flange mount. I have but one time worked on a 300 trail master but it wasn't a carb related problem. I have called in the past 3 trail master dealers for advise on jets or carb replacement. All 3 have told me they have no source for jets and they have yet to find a flange type carb that will bolt up to the intake. The only other vehicles I have ever seen with the same type intake as you have are the old CT style Honda engines used in the 50cc, 70cc, 110,cc buggies/dirt bikes and they will be too small and will not line up with bolt holes. You will either have to get another stock carb with the proper metric drill bits to drill the jet out or fabricate a new intake and go with a slide carb. Answer to your opening question, EPA.
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