I am not understanding this jet issue. Are you taking about the fuel shut off valves. Any ones I have ever changed come with a viton tip and they are matched to the seat that threads into the base of the carb. Changing them in a pair you should have no issue unless the float needs to be reset with the new parts installed. With the carb held upside down the float should be parallel with the base. If it's not that might be the fuel not shutting off issue. 
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149,682,1641,1711 with a 12hp in it 1 8" brinly plow 1 10" brinly plow 451 snow blower,H-48 International snow thrower 42" york rake with fold down grader blade.
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