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Help Hard to start and flat spot at low rpm.

Discussion in 'Hyosung 250cc' started by Rob1976, Feb 25, 2018.

  1. Rob1976

    Rob1976 Active Member

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    I need some help here. I'm not sure what i have done here but I took the bike for a 400km ride a couple weeks ago and it ran fine, didn't miss a beat. Fast forward to just a few days ago and the bike is getting harder to start cold, now requiring full choke and around 1/4 throttle to get it to fire up and a few seconds held at that position while the revs slowly make it to 1500rpm. When warm the bike almost refuses to move from a stand still and has a noticeable flat spot till around 3000 rpm. The bike had only done around 1300km since its last service, I havent touched anything since the service and have run premium fuel.
     
  2. Wozza

    Wozza Active Member

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    Check for air leaks..may also pay to check coils ,plugs and leads
     
  3. Frankster

    Frankster See the World before you leave it Staff Member Premium Member Ride and Events Crew

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    Clogged air filter? If your bike has carbs, check idle jets are not clogged.
     
  4. Rob1976

    Rob1976 Active Member

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    Just a quick update on this. I pulled off the fairings to start looking for air leaks. Turned the key and hit the starter and it started first pop. Flat spot is gone too so im starting to think that a bit of muck might have found its way into the carby and has either dislodged or worked its way through.
     
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