Question about 1999 Suzuki GSF 1200 Bandit S

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1200 bandit choking up under 3000rpm

1200 bandit been laid up for 3 years runs on three when stuck in traffic soon as i get over 3000rpm its fine again, when it was laid up i started it now and then which after a while it syruggled because it was getting choked up, now its on the road it has this problem, i have got new plugs and have run 2 tins of fuel cleaner through it, the carbs look spotless oh yes and the tube from the airbox pisses out petrol when i take the **** plug out, thanks for reading, any idea's

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  • grahamcottre Oct 25, 2009

    thanks for your help, I've now fixed it after it baffling alot of people, it turned out to be the little rubber o-rings on the float needle valves, they had perished and fuel was bi-passing them so the bike was constantly flooding.


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Sounds the pilot passages and or the needl jet air passages are blocked on the carb for that cylinder that is not fireing. The carb should be removed from the bike and disassembled and dipped in carb cleaner. What I think works best for cleaning carb is Yamaha's Carb Dip I mix it 50/50 with warm water. All the rubber parts must be removed as they will be swell and be damaged by the dip. After you dip the carb will need to verify all passages with spray carb clean to make sure the fluid will make it through the intended passage.

Posted on May 25, 2009

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