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Re: Will gsxr 750 87 carb run on a gsxf 750 89 and do i...
No there not the same carbs the katana carbs are bst36ss. and the jetting is different Kats have 105 mains in carb 1,2,and 4 with a 110 in carb 3. 32.5 pilot jet
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Get the spec sheets from online for comparison. If they match then yes. If they don't then probably not without rejetting and sorting by a specialist. Whats wrong with the one on it? Can't you get another from a bike breaker?
87-89 was a fzr1000 genesis 89-90 was a early exup and nothing fits either bike exact the carb air intake on the 87-89 is 44mm the carb air intake on the 89-90 is 60mm to make the difference change the inlet manifolds to the 89-90 specs you will have to change the carb and air box as well but you should have the output of an exup the exup has its name because of the exup valve located on the collection box on the exhaust that is there so you can change the exhaust with out having to jet the carbs up all the time
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.
thats a new one. People dump the airbox all the time and run k&n air filters instead. The airbox doesnt make that much of a difference. in fact, some actually work better without it.
Pull out the slide then lower the clip on the jet needle one notch. Then try two notches. This will richen the mid range response. Give this a try before trashing the carbs.
Go to the site below and you can download a free service manual PDF. The one you want is 47th from the top of the Suzuki list. Yes, I know that it is for '93 to '95 models. It is the closest I could come to '89 and 90% of the data doesn't change and it is free. For an exact match Google " service manuals suzuki " or go to www.repairmanuals.com Also try your local library. Often guys will donate manuals to the library.
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