Sounds like carbs need a good clean out. The 1991 model GSXR was not Electronic Fuel Injected. A model this old may also be subject to the carbs being worn out and letting in unmetered air around the screws etc, which may be keeping the revs up at idle and causing a lean idle.
Applying load will source fuel from the next jet and hide the problem. Applying choke holds back some air which will help as it sounds like too much air at idle. This will not help as much when bike is warm.
Bottom line is your carbs need a good clean and service and maybe if they are leaking air they might need to be replaced.
SOURCE: choke on a suzuki gs1100 gk /mikuni 34mm carbs
cables too tight , poor lubrication of choke and or throttle cable
SOURCE: Carburetor isues? 2007 kymco people 50 2 stroke
Oil lite on ,no reson I see for it,sinthetic oil full only 4,000 miles on oil change!
SOURCE: 90 gsxr 750 wont start, Exhaust seals?
the exhaust gaskets really should have nothing to do with whether your engine will not start. However I assume that by not starting it is turning over smoothly like it should when you try to start, having covered that most motors will not start because no fuel, no spark, or no air not withstanding some major mechanical failure in the valve train or timing or piston, cranks et al..
Trying checking for the obvious first fuel, spark, air flow. then go from there hope this helps
SOURCE: GSXR 750 Slingshot wont rev past 5000rpm, with or without choke
I have seen this before a few things to do too make sure. First take the air filter out and shine a light use your fingers to move the slides up and down I suspect the springs that go on the slide is not seated in center you can tell from the slide going halfway and hanging up. Next, the boots on the slides only go on 1 way there is a notch on the carbs for them. I would guess this would fix you up if not we can get deeper into it with air-fuel mix screw settings.good luck
SOURCE: 95 gsxr 750 when revved rpm's stick then creep back to idle
Yes, could be dirty carbs, but it sounds like a bad throttle cable to me. Check your throttle cable. It should operate with no binding, and it must freely spin back to closed when released from any position, especially full throttle. Try this procedure several times (with the bike turned off), while turning the handlebars to both stops and testing this freeplay. The throttle should operate freely throughout the entire left/right travel, including at both stops. The cable can/should be lubed, if needed. Your user manual should list a procedure for that. Also, put some penetrating lubricating oil (I prefer ProLong super lubricants myself) on all the throttle linkages, too. They tend to bind up with age. If it still sticks, you might get lucky and get away with using a high-quality fuel system cleaner to help free up the carb float response. Otherwise, you probably will need to have them disassembled and cleaned. As long as you're in there, get 'em synched, too. Good luck!
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