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There is no "main" jet, because there is only one jet per carb.
I have no idea what may be sticking, but it wouldn't surprise me that the jet has just become stuck with time.
You really need to pull the carb. apart and clean, clean, clean.
The only way to access the jet to clean it is by removing the bottom cover of the carb. You will not be able to clean the bearing surface from the top side of the car. My first guess would be that it is only a problem of gum and varnish on the outside surface of the jet and the bearing it rides in.
Just replacing the jet without cleaning the bearing would be a waste of time in my opinion. I mean you would have it all apart at that point.
It is easiest to do this with the carb off the car since you need to access the bottom.
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'60 PV544, '68 220, '70 145, '86 745T
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