Forums 🚥 PIT STOP 🔧 Hyosung Technical Help Is it normal on GT250 if rear cylinder stil cold when front hot?

  • This topic has 4 replies, 2 voices, and was last updated 1 year ago by Zsolt.
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    • #4289
      Zsolt
      Member
      • Topics: 1
      • Replies: 2
      Joined:
      Apr 19, 2020
      @zsoltny
      Oxfordshire
      GT250

      When I start engine it has issues. Starts first, but stall and need to start again and then it’s fine. Leaving the bike running for a minute, the front cylinder get hot(I cannot even touch it) while the rear still coldish… Has definitely spark, recently changed the spark plug cap to NGK racing, see here in shop and made the start better and now waiting for the high performance ignition coils.

      Can anyone give me ideas or tell me if it is ok?

      It pulls amazingly btw during the ride.

       

      Thx

    • #4291
      ♠️ MARCEL
      Administrator
      • Topics: 38
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      Joined:
      Apr 19, 2020
      @mf448kxn6
      North UK
      GTR

      Hello,

      Do you think think you can upload a pic of the rear spark plug and front plug  (Use ADD MEDIA) in your reply box.

      Or visit IMGUR. Com ,  then upload there => Copy FORUM BBCODE => and paste link on this reply box so the site will download image automatically.

       

      This because we have to see whats going on with your carb (lean vs rich) and its easier for me to get a more accurate answer.

      We need to attack the following:

      • Carb Is dirty (Pilot Jets,  Enrichment Tube which cant be removed,  Main Jet unit , Slides and whole of carb)
      • Make carb upside down on the table.  Floats must be 7mm high each (height). It really matters. That controls how much fuel each bowl gets
      • I hope and hope the mixture screws are not played with. Its the abyss if someone doesnt know how to correct them.  Ill only discuss these if we need to. Plug pictures first and carb clean everywhere, every little hole (hard)
      • Maybe it is possible to have electric issues (Coils, Plugs are tired n useless, regulator issue, battery size/too old/not enough)
      • Filter for fuel is dirty or rotting lines inside the pipe => easy to clog the carb.
      • Air Intake manifolds loose or Intake O RINGS under the engine rotted?  >>> spray carb cleaner under airbox, under carb, under manifolds to engine heads.
      • The tiniest air leak makes it hard for the carb.  Will make 1 cylinder cold and other hot.   So if revs change when spray the areas above^^^ then you have another issue that spot.

      I really hope the coils can survive a bit longer because i am being let down by royalmail and the corona crap. So i will be delayed by extra few days to a week!😢😢

       

      While you wait , see if you can respond to every query i said above ^.   And update us. 👍

      // Meditation doesn't mean you have to sit still....

    • #4331
      Zsolt
      Member
      • Topics: 1
      • Replies: 2
      Joined:
      Apr 19, 2020
      @zsoltny
      Oxfordshire
      GT250

      Hi Marcel,

      The bike is GT250EFI, carb won’t be issue.

      I’ll keep you updated and upload pics about plugs when I install the coils.

      I’ll also try to see how the engine runs with 1 cylinder, what the difference is if only front or only rear works.

      Thanks

    • #4340
      ♠️ MARCEL
      Administrator
      • Topics: 38
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      Joined:
      Apr 19, 2020
      @mf448kxn6
      North UK
      GTR

      Hi Marcel, The bike is GT250EFI, carb won’t be issue. I’ll keep you updated and upload pics about plugs when I install the coils. I’ll also try to see how the engine runs with 1 cylinder, what the difference is if only front or only rear works. Thanks

      Ahhhhhhhh!!!!
      Its an EFI – Damn it, I hope the coils don’t trip up the ECU, i may have given you ones that are a bit too powerful for the ECU! – It may get shell shocked lol.

      But if you get the dealer codes activated on the bike by following the service manual in forum  (even 650 GT has same process to activate code numbers) , it should tell us if its nothing to do with the throttle parts  (injectors, sensors etc).   I do have some efi parts off my own donor 2009 EFI, if need be, i know they work.

      // Meditation doesn't mean you have to sit still....

    • #4373
      Zsolt
      Member
      • Topics: 1
      • Replies: 2
      Joined:
      Apr 19, 2020
      @zsoltny
      Oxfordshire
      GT250

      Hi Marcel,

      I have sent an email as well.

      The coils are not the same type. i have attached the pictures of the coil what I have on the bike.

      The bike is an EFI 2011 plate GT250.

      Please let me know.

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