a 92 is a carb model & yes it should have an idle control set up. several different carbs on these.. look at your ports.... do you have a 3+1? a 3+2? all the different setups are posted here, you just need a little more info to work from.
There is an older thread in this forum called Desperately need tuning help that will give you a lot of info. on pretty much anything Suzuki. Older models that is it doesn't get into the newer stuff.