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Help Hey, need help with my 1997 GSX250f

Discussion in 'Suzuki 250cc In-line 4's' started by Chris-gsx250, Oct 22, 2015.

  1. Chris-gsx250

    Chris-gsx250 Member

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    It doesn't look like any type of filter I've seen. Sort of looks like a thread inside. So maybe to restrict flow?. But the bike starts and runs when fuel pump is disconnected( until carby is empty) . If I connect fuel pump it'll turn over but won't start
     
  2. kiffsta

    kiffsta Senior Member

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    Your fuel pump is the correct Across one, can you replace the fuel line so it feeds the carbs directly with no filters
     
  3. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    A free flowing simple filter should just be between the tank and the pump .... and make sure the filter is the correct way ... should have an arrow on it for flow direction.
     
  4. Chris-gsx250

    Chris-gsx250 Member

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    The flow direction is good
     
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  5. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    That is a small cleanable filter. You can unscrew the end to clean it. They usually give good flow, so I don't think replacing it will help your problem.
    You seem to be having an electrical problem and the first thing I would look at would be the relay to the pump. Why does it pump ok with engine running, then engine cut out when connected? Sound like a short, something to do with that relay.
     
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  6. Chris-gsx250

    Chris-gsx250 Member

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    What's the process for it to pump? When carby float goes does is there some sort of pressure or vacuum to activate the relay to activate the pump?
     
  7. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Most of these low pressure pumps have a pressure switch to stop the pump when the carbs are full.
     
  8. Chris-gsx250

    Chris-gsx250 Member

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    Pressure switch is in the fuel pump?
     
  9. Chris-gsx250

    Chris-gsx250 Member

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    Would a 1992 gsx250 carb fit straight onto a 1997 gsx250? I do know 91-94 is different bike. But is it the same carby?
     
  10. kiffsta

    kiffsta Senior Member

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    Are you looking at the ones on ebay ?
     
  11. Chris-gsx250

    Chris-gsx250 Member

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    Lol yup. I was talking to a friend and it sounds like my understanding of a carb was wrong. Mine doesn't have the float valve (the arrow shapes valve connected to the float to stop/allow fuel to go into bowl) and I thought it just meant it went out th overflow. My friend says the carby is basically a gravity fed system, so without that float valve it's forcing more fuel into carby and out the overflow. So flooding the carby big time which is why it works without fuel pump relay.
     
  12. Chris-gsx250

    Chris-gsx250 Member

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    Is my last statement true?
     
  13. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Sort of. What happened to the valves? You could just buy the new needle and seats (float valves) and fit them to your carbs.
     
  14. Chris-gsx250

    Chris-gsx250 Member

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    Hey guys/girls. I fixed the bike. :D :D Some cowboy worked on the carby's and totally ****** everything up, put bits back wrong and everything. I Put a different set of carby's on it and Now she purrs like a kitten. Here's a pic of the old ones. (Notice the 2 breather ports joined into each other? Lol). Cheers for your help

    image.jpg
     
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  15. Chris-gsx250

    Chris-gsx250 Member

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    Thanks for everyone's help so far but.... Next issue. She runs beautifully except starting cold. It rarely electric starts cold, it turns over but doesn't start. If it's warm it starts fine. HOWEVER, if it's cold and not electric starting it will push start beautifully. Easily starts on a push start. Battery is fully charged
     
  16. Pygmygod

    Pygmygod Well-Known Member

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    Using the choke whilst on cold start?
    Sometimes a tiny bit of throttle helps.
     
  17. Chris-gsx250

    Chris-gsx250 Member

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    I've tried choke, no choke, small throttle, Lots of throttle, tried a bunch of different combos. The only thing that is helping is adjusting to a higher idle + tiny throttle, then turn the idle back down once it's running
     
  18. Simon

    Simon Well-Known Member Premium Member Contributing Member

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    ..left sitting on the bike does 1 and 4, right does 2 and 3..possible as your on a 'wasted spark' ignition system is that the cylinder will fire on the wasted spark as opposed to the actual spark..valve timing overlap means it will pretty much fire both ways but if it bogs down, wants to stall (especially when hot) then incorrect HT wiring or a more likely coil problem, if so dyna coils are a permanent fix but not cheap Dynatek - DC1-1 - Coil, 12v/3 OHM is a direct fit and will sort it out, all Suzuki's, 4cyl 16v (carb) are wired the same, from the katana through the gsxr250, 400, gsxf 600 750, gsxr 750 and 1100 of that era..timings good at 16 pins for the across mate!!!!!
     
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  19. Chris-gsx250

    Chris-gsx250 Member

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    -Leads are correctly in.
    -Timing is 16 pins as it shows in the manual
    -what's HT?
    -if it is coil how much is dyna coil? I'm assuming it shows me in the manual how to test coil?
     
  20. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    HT = high tension = spark plug leads

    Coil resistance can be tested .... should be in the manual
     
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