Quoting Removed, click Modern View to seeI have been inside 33, 341, 580, but not 428, so I can't be sure on 428, but you should e-mail Gary. I have seen other M/S carbs where jet is incorporated into the nozzle.....not saying your is like that, however. I can see how the 33/241 carbs could run without a main jet, since the Main Power Adjust is in simple series with the main jet....not sure it would run "right" but run. I'll send you Gary's e-mail in an e-mail to you.
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