Question about 1993 Suzuki GSX-R 600

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GSXR600 wont rev up when throttle is cranked

I have a 92 GSXR600 it will idle but when the throttle is twisted it revs up and down if I turn it slowly idle raises fine and when I get to around 4500 I can crack the throttle and it works normally. Any idea what would cause this? josh

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  • josh_xak May 28, 2009

    I am going to change the plugs tomorrow so I have not checked them I will let you know what color they were. But the fuel needles in the carbs are black in spots and slightly ruff not smooth like the rest of the needle. Do you think this could cause it to hang up? Otherwise I have torn the carbs down and they look good. Also most the parts in the carbs were replaced before I got it but the needles and jets were for sure not touched.

    Josh

  • josh_xak Jun 01, 2009

    Okay I put new plugs in the bike same problem. The old plugs were not to bad looking. I think I adjusted the air fuel. That's the screw under the plug on the bottom of the carbs right? It revs up good now not much hesitation but it cuts out when it hits about 8500 rpm. Any more good Ideas.

    Josh

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Hi and welcome to FixYa,

Offhand, it would appear to be a carb issue. Initial suspect would be that the sliders (plungers) are not rising fast enough. This could be caused by:

  • varnish like coating / buildup impeding smooth movement;
  • poor vacuum;
  • leak on the diaphragm area;
  • clogged jet(s);
  • restricted air intake.

Incidentally, what is the color of the sparkplug ends?

Good luck and thank you for using FixYa.


Posted on May 28, 2009

  • Louie  Role
    Louie Role May 28, 2009

    The delay in RPM pickup (hesitation) is an air/fuel issue. The color of the plugs will tells us if the mix is lean or rich. It would be if lean; very light brown to almost whitish (most likely) or the exact opposite sooty black (least likely)

    Looking forward to your updates.

    Cheers.


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