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    • #4718
      Alan McLean
      Member
      • Topics: 3
      • Replies: 6
      Joined:
      Jul 21, 2020
      @macker
      Orihuela Spain
      Aquila GV125
      Points: 159

      Hi All, as you may have seen I recently purchased a 2010 GV125 with less than 2k kilometres on the clock and the bike looks almost new.

      However I do have a small issue in that there is no power in the lower rev range, for example if I come out of a corner and accelerate the bike almost dies 😞

      I guessing it’s a fuelling issue taking into account the mileage on the bike it obviously hasn’t been ridden much so I’m guessing the carb’s need a good cleaning.

      I have read some thread’s on removing the carb’s on these and sound’s like a pig of a job, so here are my questions 1) can the carb’s be successfully cleaned in situ? 2) If not any suggestions on how to remove them? 3) If I have to remove them I will probably take the opportunity to rejet them, given I’m in Spain were temperatures are 25c – 30c what size Jets should I go for and lastly 3) Given the temperature’s here should I use a cooler running plug?

      Sorry about the long post, but looking forward to your help and advice.

      Cheers.

    • #4727
      ♠️ MARCEL
      Administrator
      • Topics: 38
      • Replies: 366
      Joined:
      Jul 21, 2020
      @mf448kxn6
      North UK
      GTR
      Points: 4,200

      Hey,

      it is not ideal to work on the carb while it is resting on the manifolds because the rubber is very easy to crack and it is very hard to order new ones since Hyosung stopped making them (discontinued).     Even the engine can be lowered down to have more room to remove the airbox.

      I would rather hold the carb very tight with my hands while forcing the airbox out of the bike.  strange design yes it is but thats Korea lol

       

      Carb jetting  = there is a [Tutorial]  already on the forum , check it out.  for GV125 i would use 90 front mains and 92.5 rear mains. Thats more than enough even for summer heat.  you dont want the bike too rich it will start bogging down unless you have powerful electrics , freeflowing leovince pipes.

      92.5Front and 95 rear would be extreme but a limit!  thats a 250cc bike jetting!

      The pilot jets = never changed. And also never mess with the mixture screws too, it would be the abyss if you do hence its usually discouraged by the OEM maker too.

      Standard CR8E or Laser NGK is more than enough.  Hyosungs like the size 8 plugs.  they run weird with others. Denso is not good for hyosungs either.

      You are better off by improving the oil cooler system to a 250cc one, ngk laser plug, better ngk caps as they handle heat better, coils,  slightly richer carb.

      Also check (Slide Mod) on this forum which helps the bike speed up around 4k-8k revs (mid range tune)

       

      Hope this info helps, lets see how you do 🙂

       

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

      • #4728
        Alan McLean
        Member
        • Topics: 3
        • Replies: 6
        Joined:
        Jul 21, 2020
        @macker
        Orihuela Spain
        Aquila GV125
        Points: 159

        Thanks Marcel, I have read both those very informative tutorials you have done, so it looks like the carb’s are coming out (as I thought and best practice) can you recommend where I can get the two main jets I need!

    • #4734
      ♠️ MARCEL
      Administrator
      • Topics: 38
      • Replies: 366
      Joined:
      Jul 21, 2020
      @mf448kxn6
      North UK
      GTR
      Points: 4,200

      Thanks Marcel, I have read both those very informative tutorials you have done, so it looks like the carb’s are coming out (as I thought and best practice) can you recommend where I can get the two main jets I need!

      You can PM me as i have some ebc ones stocked.  should be cheap airmail also.

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

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