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Help Bleeding Carby's?

Discussion in 'Hyosung 250cc' started by Rob1976, Dec 6, 2017.

  1. Rob1976

    Rob1976 Member Premium Member Contributing Member

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    Hi, I've just finished putting all the major parts back on my '08 gt250r just have the side fairings to put back on. The issue I'm having is the bike won't start. I have good compression and spark but I'm thinking it's the carby's needing bleeding. Any ideas on how to do this?
     
  2. Murdo

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

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    Open the drain screw in the bottom of the bowls and let run until fresh fuel comes through.
     
  3. Rob1976

    Rob1976 Member Premium Member Contributing Member

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    Thanks. Did that and the bast@#d still won't start
     
  4. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club

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    If the carbies are full of old fuel and it won't start, the best course of action is to clean out the bowls, jets, and and other small orifices (air jets etc).
     
  5. Rob1976

    Rob1976 Member Premium Member Contributing Member

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    Its only been a month since it was last started and it ran fine then. Would everything be gummed up after a month?
     
  6. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club

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    It depends on the fuel type and the conditions, eg E10 rubbish fuel and bike left outside... hot sun during the day, cold at night, will create condensation in the carbs. Ethanol is hygroscopic, like brake fluid, so it will take on the water and absorb it. This contaminates the fuel.
     
  7. Rob1976

    Rob1976 Member Premium Member Contributing Member

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    Cool thanks. So it looks like im pulling the carby's. Ive never done Carby's before.
     
  8. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

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    Before you do the carbs, pull the plugs out and check them
     
  9. Rob1976

    Rob1976 Member Premium Member Contributing Member

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    What am i looking for on the plugs? Im a noob at motorcycle maintenance.
     
  10. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

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    Just have a look at the colour , feel
    Free to post a pic
     
  11. Rob1976

    Rob1976 Member Premium Member Contributing Member

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    Cool. I will do that tomorrow after work.
     
  12. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

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    Whats the story with the your bike? ... did it run before?

    Could be many reasons it wont start ... but Ive started my FZR nearly always first attempt after its sat for months

    If its turning over but just wont fire then try all combinations ... choke , no choke , half choke , bit of throttle , no throttle , full throttle while u turn it over
     
  13. Rob1976

    Rob1976 Member Premium Member Contributing Member

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    Yeah i bought the bike as a runner and being an idiot i took it for a bit of a run on old tyres and dropped the bike. Not much damage, just scratches and decided to remove the fairings and repaint the bike. While i was at it i replaced the inlet manifolds as they were looking perrished. Tonight i put the freshly painted tank back on and fueld the bike up but it wouldnt fire up. It just turned over.

    I tried the choke options and throttle to no avail.
     
  14. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club

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    Fuel tap?
     
  15. Rob1976

    Rob1976 Member Premium Member Contributing Member

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    Hyo's fuel tap is vacuum opperated. I checked to make sure it was opening.
     
  16. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

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    As Murdo suggested , did u confirm theres fuel running into the bowls?

    Is there an inline filter? ... is it on the correct way with the flow direction?
     
  17. my67xr

    my67xr Well-Known Member Premium Member

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    Tried 'Start Ya Bastard' down the throat's of the carby's ?
     
  18. logan anderson

    logan anderson Member

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    I had this problem the other day, might not be the best idea but I just put a few ml's of gas down each carb and turned it over
     
  19. Rob1976

    Rob1976 Member Premium Member Contributing Member

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    Thats a yes to both.

    No, there not that easy to get to. Means removing the tank to get access to the air box.
     
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  20. Murdo

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

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    Sometimes a 'sniff' of starter spray into the air intake while cranking is enough to 'light the fires' in the cylinders.
    Have you checked that the plugs are firing?
     

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