Forums 🚥 PIT STOP 🔧 Hyosung Technical Help Carb Mixture Screw Settings Helo – GT125

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    • #6645
      Peter
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      Nov 16, 2021
      @ziltoid891
      Oldham
      Gt125r comet

      Can anyone please tell me what the factory air/fuel mixture screw settings are as mine have been messed with they’re currently at 3 turns at the front and 4 at the rear

    • #6646
      ♠️ MARCEL
      Administrator
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      Nov 16, 2021
      @mf448kxn6
      North UK
      GTR

      Korea did not reveal the turns to discourage owners tampering with them , and due to the fact  125cc and 250cc  , GV  and GT,  have slightly different turns from each other  based on what model the bike is and the jettings used.

      So your profile says GT125R  (a carb with a jet pump attached to the rear float bowl),  use around 2 and 1 quarter to 3 full turns max.      Rear being slightly richer as it’s the hottest cylinder.

      1/8 of a turn does make a difference, so i would encourage a carb ultrasonic cleaner and dead-on adjusted clearances  & lastly a religously clean intake system that’s also leak-free including how far the airbox swallows the carb, and intake manifold orings changed.

      You will find that if any of the above ^ is not done, the mixture messing will be a nightmare to get it spot on.

      Sometimes tools to anaylize the heat of the exhaust pipes also helps  , even as much as reading the air/fuel ratio that’s coming out of the tail pipe.  Clean & new spark plugs will be a good hint after a short run.

      Show us the plugs when done.  (though , it can be expected to go through 1 or 2 plugs , as per typical “plug chopping” process)

      I hope this reply helped.

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

    • #6647
      Peter
      Member
      • Topics: 1
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      Nov 16, 2021
      @ziltoid891
      Oldham
      Gt125r comet

      Thank you your a star I’ll give it a go tomorrow also the gt125r has 5 gears not 6 is this right?

    • #6648
      ♠️ MARCEL
      Administrator
      • Topics: 38
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      Nov 16, 2021
      @mf448kxn6
      North UK
      GTR

      Thank you your a star I’ll give it a go tomorrow also the gt125r has 5 gears not 6 is this right?

      Correct even 250’s have 5 gears ,  they don’t need 6 gears for what they are to be fair. Although 6th be a little nice overdrive haha.

      It took 6th gear for a Yammy YZFR125 to hit the 80s ,  hyo does that in 5th.

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

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