The screws beneath the caps in the carbs...

[jvitzu]

What are these called on the later models? (the ones with two capped screws on each carb)

And how should they be set when rejetting a carb? Just tighten them snugly?  My bike is stock air, stock exhaust w/ 20/132.5/60 & 2 shims/needle.

Any advise is appreciated - thanks

[scottpA_GS]

IF they are the ones under the brass caps that you drill out and pop off

Never tight!.. They are (mixture screws) and mostly are at about 2.5 turns out w/ factory parts.. you have to set them based on your aftermarket exhaust/filte/jet combo

[jvitzu]

OK, noted.  When I took out the caps, these screws were tightened down, so I was a little confused about why all the FAQs talk about "3 turns should be good".  I thought maybe they mean the Idle air screws in the float bowls, but that clarifies - thanks.

[scottpA_GS]

They were tight when you took the caps off I duno about that.. I would think it would not run at all like that 

Maybee someone else knows something I dont. What year is your GS?

[Suzuki Stevo]

When I took out the caps, these screws were tightened down

You may have touched them inadvertently with the drill...running them in as a result?