Zenith 11475B is an aftermarket replacement carb, and the adjustable main jet is an integral part of the calibration. Do not replace it on this carburetor.
And 32vid - thanks for the recommendation, but carbking is too busy in the manufacture of kits to rebuild carbs. Have not done one in almost 4 years. The kit business keeps me busy.
But if it were my own carb, and I didn't wish to do it myself, I would send it to Classic Carbs in Phoenix, AZ. Of all those mentioned in this thread, they are probably the most expensive; but I have seen the work of most mentioned, and Classic is THE best! If you send it to Classic, be prepared for a LONG wait. I am not the only one that thinks they are the best.
Jon.
