Looking to find out what the stock main jet sizes are for the primaries and secondaries. Also, has anyone had any luck with different sizes?

 

for what year and market? Mazda had slightly different jetting over the years, and between CA and federal.

and i'm not sure what you mean by luck either, power is basically dictated by airflow, and the jetting will have a really small effect. if you were trying to pass smog, or squeeze and extra MPG out of it, that would be doable.

 

1985 carb on an 83 car with a stock 12a (non-ca)

 

It looks like I have a 92 and a 100 if I read them accurately. Would 100 be the secondary?

 

92 and 160 is what you have. The little stamps can be a bit small, as you can('t) see.

 

Unless you modify the rest of the carb, messing with the jets is a waste of time and money.

 

Not desiring to mess with the jets. Again, my concern was that the jets installed (92, and 160) are the correct size for the stock Nikki. I hope someone knows! Thanks guys

 

They are correct. They are factory matched to the carb's airflow in order to work correctly with the cats for emissions purposes. In other words, they must keeps the cats alive.