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    • #3616
      Josh D
      Member
      • Topics: 4
      • Replies: 4
      Joined:
      Dec 16, 2019
      @joshhyogt125r2015
      North wales
      Hyosung GT125R 2015
      Points: 62

      I have a problem when i put the choke on to warm up the bike, I then turn the choke off after about 5-10 mins the bike stays at 6k rpm.

      the choke switch feels a lot looser than usual and when i apply throttle the revs drop to about 1k-2k rpm then goes back up to 6k rpm and wont go back down. i did test ride the bike and rides fine apart from taking off and the top speed is maxing out around 60-70 mph and should be the top speed of 75-80 mph.

      i think it could be the return spring is jammed up or throttle cable.

      if it helps its a GT125R 2015.

    • #3622
      ♠️ MARCEL
      Administrator
      • Topics: 38
      • Replies: 383
      Joined:
      Dec 16, 2019
      @mf448kxn6
      North UK
      GTR
      Points: 4,349

      Let’s start with the carb so that this huge thing is out of the way,  we all dread going to it but needs must sometimes!
      – > check your gold discs inside carb mouths are fully shut when the throttle is shut or look out for possible “notching / grinding” feeling if you tried to force the carb throttle shut even more.

      If it doesn’t twitch if you tried to force the throttle shut, then gold discs should be OK. If the gold discs were not shut, even a small amount of air will leak in to the engine combustion ==> revs go up!

      Any situation concerning high revs is almost always mystery air entering the bike in some way

      So with the carb investigated, clean its jets , pilots especially make sure you can see the holes or shine a light thru.  The pilots can gum up easy when fuel is bad , so the revs again will shoot up   = leaning out effect because less fuel has entered the bike combustion cycle.

      Carb done ?  Be very very religious about your intake manifolds, make sure they have no cracks  and the “manifold” o rings haven’t looked crushed or old  (otherwise i’d recommend changing them if they are too old , they may sneak air in which leans out the fuel thats about to enter pistons.
      it’s these ones here.

      Intake Pipe O-RING (Inlet Boot Seals) x2 – GV125 GT125 RX125 GV250 GT250 Hyosung

      Next up, go inspect the airbox for anything suspicious that may sneak air in (eg. cracked mouth openings etc, filter not sat properly etc, loose clamps)

      On the choke side, check your carb rails where the choke slides across,  u will see the plunger come out (on)  and go back in fully (off)  , or else check cable isnt trying to pull it. riding on choke no good for piston rings , i might add.

      If we deal with the carb and intakes properly, then it will ride better ,   see how she runs then we go from there to attack other things .

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

    • #3623
      Josh D
      Member
      • Topics: 4
      • Replies: 4
      Joined:
      Dec 16, 2019
      @joshhyogt125r2015
      North wales
      Hyosung GT125R 2015
      Points: 62

      I sorted the bike now

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