Question about 1990 Suzuki GSX-R 750 L

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84 gsx750se starting problem!

I've just bought a 84 gsx 750se not running, the previous owner used to bump start it as the battery was dead, so i bought a new battery, changed the oil&filter and put new plugs in,cleaned the tank out and put fresh fuel in, it turns over but will not fire up, so i sprayed ether engine starter through the air intake and it started and rev'd but would not stay running on fuel! could it be a fuel pipe problem? should the tap be on ON or PRI to start? help before i take it to the dealers please!

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  • arranadair May 30, 2009

    thanks for the quick response! i will try what you have recomended and get back to you with the result!

  • arranadair Jun 03, 2009

    i unscrewed the carb drain plugs and fuel came out, so i drained that off and sprayed carb cleaner up them and into the bowl, i put everything back together and started it up, it fired up and was revving irregularly for about a minute then stopped and wouldnt start again.

    so theres fuel getting to the carbs but im not sure it was running off the fuel or the carb cleaner i sprayed into them!

    Any ideas on what i can try next please?? thanks..

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Hi and welcome to FixYa,

PRI setting allows fuel to flow from the tank to the carbs whether engine is running or not while ON requires that there is vacuum (engine running) for the fuel cut-off valve to allow fuel to flow (safety feature).

To determine if fuel is reaching the carbs, loosen the drain screw at the bottom of the carb's bowl. Fuel should leak out of the drain hose. For safety reasons, ensure no open flame and the fuel is collected in a suitable container. Another that could be tried is to turn off fuel from tank, temporarily remove the drain hoses from each of the carbs and spray the inside of the bowl through the drain hose nipple using carb cleaner. It would be easier to use the narrow tubelike nozzle that comes with the carb cleaner.

Good luck and thank you for using FixYa.

Posted on May 30, 2009

  • Louie  Role
    Louie Role Jun 03, 2009

    The irregular rev indicates it was burning the carb cleaner. Drain again and note the quality & quantity of fuel. The amount drained from each bowl should roughly be equal on all.

    Pls note, if you are on PRI, the fuel should continuously flow. If on ON, fuel would flow when cranking. Pls check both instances. This of course means that after loosening the drain screws, they temporarily need not be screwed back in for test/observation.


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