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Help Bleeding Carby's?

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

  1. 2valve

    2valve Well-Known Member

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    May sound really stupid , but can this model bike turn over with the kill switch on ?.Just a thought !
     
  2. Rob1976

    Rob1976 Active Member

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    Yeah the plugs are firing

    No the bike doesn't turn over when the kill switch it on.
     
  3. Rob1976

    Rob1976 Active Member

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    Ok so after pulling the plugs and checking a few things i tried to start it again. The bike coffed a little trying to start for a brief second. Had a quick look and noticed the fuel filter 3/4 full of air. I pulled the fuel hose and the fuel is coming out as a trickle even with a forced vacuum on the fuel tap.
     
  4. Murdo

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

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    Sounds like a fuel blockage in the tap or filter in tank.
     
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  5. Rob1976

    Rob1976 Active Member

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    Yeah I'm going to replace the fuel filter and strip the fuel tap. Fingers crossed.
     
  6. logan anderson

    logan anderson Active Member

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    To be honest, before replacing stuff I'd pull the tank and drain the carbs to see if it's receiving and fuel first
    Most bikes should run.... 5ish minutes at idle on whats in the carbs
     
  7. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    The fuel tap filter screens are likely clogged. Tank off, dump the contents, take out tap, disassemble and clean. New seals if required and put it back together with fresh fuel
     
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  8. Rob1976

    Rob1976 Active Member

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    Yup doing that. New fuel filter too. At $10 I might as well.
     
  9. Rob1976

    Rob1976 Active Member

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    Well it fired up. After not touching it for a few days I decided to just give it one last go before resorting to playing with the carby's and first press of the starter bang right up to 8000rpm idle. I have found the problem just unsure on what caused it or how to fix it.

    The throttle has a sticky point in it. Turn the cam where the throttle cable goes on past the sticky point and its a beautiful, smooth idle. Take it to the point and you can feel the click as it goes past. And it wont return past that piont without assistance.
     
  10. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    There are usually 2 throttle cables, a pull to open and a push to close. The 2nd is a safety feature as butterflies can get stuck open (not a problem in 250's).

    First try cleaning and lubricating the throttle tube and cables, and if it's no better, remove the 2nd cable leaving only the pull cable to open the throttle and see if it improves.

    Also check that nothing is obstructing the throttle plate or sync screws
     
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  11. Rob1976

    Rob1976 Active Member

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    Well i officially fell like an idiot. When i installed the clamps that hold the carby's onto the intake manifolds i put one of them against a little arm on the rear carby. Moved that and problem solved. :headbang:
     
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  12. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    Yes that'd do it. Has happened to me with carby/airbox boot clamps hitting the throttle plane, exactly why I mentioned it.
     
  13. Rob1976

    Rob1976 Active Member

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    At least that was one fix that didnt cost me money
     
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