Question about 1999 Suzuki GSX-R 600

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99' Suzuki GXS-R 600.. Won't start unless you pull the "CHOKE" and stalls if you turn off the Choke. Also it sputters at idle, I drained the tank and put in fresh gas, replaced air filter... want to know what's been overlooked.

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Overhaul the carburetors or just take them apart and clean them you may have needles sticking and jets plugged, buy a kit, and or clean all pieces of carb inside and out with gum out carb cleaner and put back together blow all airs out with compressed air. When done screw in air fuel mixture screws all the way and turn counter clockwise out 3 full turns to fire it up then adjust accordingly.

Posted on Oct 11, 2010

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  • Mvp4eva Oct 11, 2010

    First of all thanks for your reply, One question I was asking myself if it had carburetors or is fuel injected.

    Its my friends bike and I have little to no knowledge about bikes.. I more inclined towards repairing automobiles.

    My prognostic was, maybe a dirty carb like you said but, I wasn't sure if it use carburetor, I thought maybe clogged or dirty injectors.
    ......This is the bike problems, it starts by turning on the choke, it sputters while idling and it back fires once or twice if you rev it up and let go of it and last but not least it stalls when you turn off the choke.

    I will do what you just told me, Oh, to let you know this bike was not driven for nearly a year..

    I'll keep you updated .....thanks again.

  • Mvp4eva Nov 10, 2010

    HI again. this is my first update, I know it took me a while but I was waiting for the parts to be delivered .. I bought the carb kit and replaced every seal and new jets, cleaned all pieces of carb inside and out...........

    The bike starts with its choke on and never on its own, but it runs smoother now...when I start to bring the choke down to about 1000 rpms I can't turn the choke any lower because it stalls..
    .........................when the bike is idling (1000rpm) I give it gas and it sounds that it wants to stall....is like gasping for gas when i hit the throttle.....I havent done anything to the air fuel mixer screw, is that the spring loaded screw in between each carburetor?

  • DillyWackSac
    DillyWackSac Nov 10, 2010

    Well, The running smooth part sounds promising, but your still lacking throttle response? So, the gas line coming into the carbs, make sure there is plenty of gas running through the line. Remove the line to check this, make sure no spark is around. If so, adjust air/fuel mixture screw as i mentioned in my earlier post. The screws are down low on the carbs facing towards the seat when mounted on the intake. Each carb has one screw. The screws that have springs are idle adjusters not air/fuel mixture you might turn those in to bump up the idle clockwise 1/4 turn, just a hair while adjusting the air/fuel. The air/fuel mixture screws may have caps on them and you may have to drill them out, just drill about 1/8-1/4 inch in careful not to drill the screw. Once adjusted to allow idling then should at least rev up normal if not you still have trash in the carbs if you never took out the air/fuel screw then you did not clean the carb properly. The must be disassembled completely and cleaned with gum out carb cleaner or something similar. Every hole blown compressed air through and looked through if possible and you should see daylight. Make sure you pull your spark plugs to make sure they are not black. If the are then they have been fouled and replace them. Hope this helps.

  • Mvp4eva Nov 16, 2010

    Update # 2. The bike still lacks throttle response, I checked the gas lines that goes to the carbs, there's plenty gas flow, then I adjusted the air/fuel mixture screw, It didn't make any difference, there still was no gas response, another thing, the bike starts with the choke On but the RPMs don't go over 2000 rpm with its choke On, I'm running out of ides, 1) should I Separate the carbs from each other and clean them again but this time one by one? or 2) disassemble the carbs to the last screw? I mean from my point of view the carbs look very clean inside out, did I missed something? Should I go back to basics? like a bad fuel pump lacking pressure or bad spark plugs ...maybe a sensor somewhere? This is the current problem now, it lacks throttle response, its sputtering and when I hit the throttle there is a delay , I hit the throttle then 2 or 3 seconds later it revs up , erratic idle , bike don't start unless the choke is on and the RPM stays low 2000.. it should be the opposite, when you first start the bike with its choke all the way On the Rpm should reach roughly 7000 rpms on a cold start.. What could be restricting the gas flow? Thank you for replying.

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