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GSX250 cutting out at high speeds.

Discussion in 'Suzuki 250cc Twins' started by Jasper Hunter, Jan 2, 2015.

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  1. Jasper Hunter

    Jasper Hunter Active Member Premium Member

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    Update, I cleaned the carbs, changed sparkplugs, changed inline filter, cleaned tank, cleaned the petcock and cleaned the airbox.
    It's turned out a little bit better.
     
    • Like Like x 1
    Jasper Hunter, Jan 8, 2015
    #21
  2. Jasper Hunter

    Jasper Hunter Active Member Premium Member

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    Fun fact it was the engine all along. it just doesn't have the power anymore.
     
    Jasper Hunter, Jan 16, 2015
    #22
  3. Murdo

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

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    Why would that cause it to cut out?
     
    Murdo, Jan 17, 2015
    #23
  4. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    Jasper, how did you find this out?
     
    Frankster, Jan 17, 2015
    #24
  5. Jasper Hunter

    Jasper Hunter Active Member Premium Member

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    After I cleaned the carbies it smoothed out and stopped cutting out on me , instead it heavily struggles on hills and slopes requiring me to go extremely slow up them
     
    Jasper Hunter, Jan 17, 2015
    #25
  6. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Is it bogging down? It could be the fuel or a leak in the petcock, too much fuel getting through. Grasshopper had a bogging issue while running 95. It hauls arse on 91 though
     
    Linkin, Jan 17, 2015
    #26
  7. Jasper Hunter

    Jasper Hunter Active Member Premium Member

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    It's not bogging unless I push it to 85-100km/h. the only other thing I have noticed is that exhaust fumes seem to be coming out from where the exhaust and muffler are connected together.
     
    Jasper Hunter, Jan 17, 2015
    #27
  8. Jasper Hunter

    Jasper Hunter Active Member Premium Member

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    The exhaust also seems to have a white tinge to it.
     
    Jasper Hunter, Jan 17, 2015
    #28
  9. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    That seems to indicate it's running lean at that rev range, I'm no expert through
     
    Linkin, Jan 17, 2015
    #29
  10. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Leaky joints arnt going to help your cause .... pull the muffler and check also for holes or wateva and get it back on with a decent seal and tight

    Make sure the headers are sealed at the engine also
     
    GreyImport, Jan 17, 2015
    #30
  11. Jasper Hunter

    Jasper Hunter Active Member Premium Member

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    Turns out they were just about sitting there, most of the bolts weren't even tightened.
    any way it's running a bit better now still not a lot of top end power though.
     
    Jasper Hunter, Jan 19, 2015
    #31
  12. Willrcr15

    Willrcr15 Well-Known Member

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    Check the inlet rubbers or whatever parts connect the carby to the engine, could be sucking air through perish cracks in the inlet manifold or under the mating face seal/o ring or what ever it has.
     
    Willrcr15, Jan 20, 2015
    #32
  13. Jasper Hunter

    Jasper Hunter Active Member Premium Member

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    Ok so I've found out that the problem was partly because I was not at a high enough rpm, since changing that it's been going a hell of a lot better yet it will still cut out if I push it really hard for a long amount of time.
     
    Jasper Hunter, Jan 22, 2015
    #33
  14. Willrcr15

    Willrcr15 Well-Known Member

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    Be careful not to blow the thing up, over revving on the stand without any load isn't good especially if she's got a bit of age, worn bearings, rings etc.
    Were all still guessing, sounds like it could be low fuel in the bowls, check that the floats are set at the right height, there's been some improvement after you cleaned the carbies which suggests it could be them. I think you said you changed the fuel filter ?
     
    Willrcr15, Jan 23, 2015
    #34
  15. Jasper Hunter

    Jasper Hunter Active Member Premium Member

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    I have replaced the fuel filter.
     
    Jasper Hunter, Jan 23, 2015
    #35
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