1. Where can I get the rubber plugs that cover the hole the pilot jet is in? I tried Bike Bandit with no luck.
How serendipitous, I was just working on my carbs recently and had to deal with this same thing. The plugs are in fact still available from BikeBandit. I just looked, they are number 8 on they're schematic.
2. Is the air screw supposed to have a spring under it? Mine have o-rings, but no spring.
Oh yes. And there's suppose to be a washer too.
Those are no longer available. Or maybe I should say Suzuki never made them available. I stood at the local Suzuki Parts counter looking with the counter guy for nearly a half hour for the same thing. The wierd thing is that the o-ring, washer, and spring are available the first year the 600 bandit was made. I ordered sets of those but haven't received them yet. All of us at the counter were pretty confident they would work, we'll see.