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    • #13584
      Chopper_Whitewolf
      Member
      • Topics: 7
      • Replies: 12
      @chopperwhitewolf
      Glasgow
      2008 Hysoung GV650 EFI Anniversiery Edition

      I have tried adjusting the TPS but I still have low speed lag and stutter after getting the engine up to temp. The issue is most notable when coming to a complete stop after exiting the motorway or when stuck sitting in traffic. While sitting still after the bike is up to operating temperature, the idle will be so low it is not uncommon for the engine to cut out. Each time I have adjusted the Throttle Position Sensor it runs a bit better for a day or so then the issue returns.
      This is my first electronic fuel injected bike. I have decades of experience with carbs but am at a complete loss with these electronics. I’ve been pondering sending my ECM off for a flash tune.

      Please advise

      --==I have come to comfort the disturbed and to disturb the comfortable==--

    • #13586
      ♠️ MARCEL
      Admin
      • Topics: 45
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      @mf448kxn6
      North UK
      GTR

      Is halfords near you?  Get a bottle called WYNNS FORMULA GOLD PETROL  ,  strictly this bottle only as i rave about it all the time. Redex is just junk.
      Pour the whole bottle inside.
      Make sure there is about max half a tank inside  (less diluted if the tank is full) , ride until you reach 1 or 2 bars as long as you are within proximity of the service station to refil.

      Use e5 fuel only.  They don’t like E10 at all.

      Use fresh CR8E spark plugs from halfords during this.

      Report back and let us know if the “soft cleaning” has helped your entire fuel system  (incase there is debris all over the fuel system from tank pump right down to injectors)   , yes a pump that’s bad will make a bike run very rough , vise versa to the clogged injectors too.

      If not,   are you able to download the service manual on this forum that corresponds to the year of your bike, and follow the instructions to trick the ECU to output any error codes  (past or present that may be stored in the ECU)

      Externally,  remove the “GOLF BALL” that is near the airbox system with 3 or 4 pipes sticking out of it going from airbox to the throttle bodies , this is your “Idle Speed Controller Valve” (ISCV) , it is what controls idling when the bike is at closed throttle  (neutral) ,  sometimes this object needs replacing.  There is a few versions ,  so take pictures ,  i may have spare ones on ebay of these ISCV’s

      Check your regulator is 14v idling (13.5 absolute minimum) to 14.5v max and the voltage doesn’t drop when revving to about 5,000 rpm ish

      If it does,  replace the regulator ,   unstable voltages will make the whole EFI system haywire , unlike carb bikes that can still chug on , but EFI likes the electrics delivered pretty consistently

      Keep an eye on this topic too, it may relate to you a little bit i hope

      GT650R Fuel Pump Fault

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

    • #13598
      Chopper_Whitewolf
      Member
      • Topics: 7
      • Replies: 12
      @chopperwhitewolf
      Glasgow
      2008 Hysoung GV650 EFI Anniversiery Edition

      Excellent.
      The chain conversion kit should arrive tomorrow or Tuesday. As soon as I’m able to get to Halfords I’ll start going down the prescribed list of fixes. Hopefully it is just a gunked up system from the previous owner having left it sitting for several years and the WYNNS FORMULA GOLD PETROL will set me to rights.

      Thank you

      --==I have come to comfort the disturbed and to disturb the comfortable==--

    • #13601
      Chopper_Whitewolf
      Member
      • Topics: 7
      • Replies: 12
      @chopperwhitewolf
      Glasgow
      2008 Hysoung GV650 EFI Anniversiery Edition

      These should hopefully arrive in the next couple of days too.
      I’m a big guy and by myself, without any bags or pillion I’m 115kg. Unfortunately, I don’t have a garage but at least my flat has a private parking lot. Fingers crossed for good weather. Next, after recovering from recent expenditures, I’m going to get rid of that craptastic cheap can. Not only is it an ugly cheap knock-off not rated for 650cc, it doesn’t even have an adjustable baffle

      --==I have come to comfort the disturbed and to disturb the comfortable==--

    • #13608
      ♠️ MARCEL
      Admin
      • Topics: 45
      • Replies: 1,880
      @mf448kxn6
      North UK
      GTR

      beautiful girl ,  really like the limited edition red frames & the cherry wheels,  don’t divorce it 🙂

      as you have guessed , Scotland is a bit colder than Texas!  – So indeed, keep it as clean as you can, this island is wonderful for its green orgasmic sceneries but not the weather!

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

    • #13631
      Chopper_Whitewolf
      Member
      • Topics: 7
      • Replies: 12
      @chopperwhitewolf
      Glasgow
      2008 Hysoung GV650 EFI Anniversiery Edition

      I’ve clearly got to get some mechanical issues sorted, but this winter I’d like to start addressing the frame rust and flaking paint. I’m also going to delete that unnecessary hunk of plastic attached underneath rear fender.
      Do you happen to know where I might paint match for touch ups? I can’t seem to find the Hysoung paint codes for the 30th anniversary edition
      (#86 of #1000. Yeah, bit of a brag)

      --==I have come to comfort the disturbed and to disturb the comfortable==--

    • #13635
      ♠️ MARCEL
      Admin
      • Topics: 45
      • Replies: 1,880
      @mf448kxn6
      North UK
      GTR

      I’ve clearly got to get some mechanical issues sorted, but this winter I’d like to start addressing the frame rust and flaking paint. I’m also going to delete that unnecessary hunk of plastic attached underneath rear fender. Do you happen to know where I might paint match for touch ups? I can’t seem to find the Hysoung paint codes for the 30th anniversary edition (#86 of #1000. Yeah, bit of a brag)

      Hyosung doesn’t usually say the exact codes as they use inhouse paint.   Maybe a local body shop can closely match it for you and mix in a spray can if you desire ?

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

    • #13646
      Chopper_Whitewolf
      Member
      • Topics: 7
      • Replies: 12
      @chopperwhitewolf
      Glasgow
      2008 Hysoung GV650 EFI Anniversiery Edition


      https://www.manualslib.com/manual/406876/Hyosung-Gv650fi-Parts-Catalogue.html#manual

       

      Found this, but haven’t yet been able to locate an OEM parts manual specifically for the anniversary edition. This site does seem to be a treasure trove for OEM manuals

       

      --==I have come to comfort the disturbed and to disturb the comfortable==--

    • #13652
      ♠️ MARCEL
      Admin
      • Topics: 45
      • Replies: 1,880
      @mf448kxn6
      North UK
      GTR

      The codes in the books are used by dealers to tell Hyosung which panels to send if rider has a crash or needs replacing  ie.   For  Black rear panel,  we would say send us “12435HG12345-SBK”   =  SBK  Black code for some GT bikes.

      On the Hyosung GT bikes, the red is different , and the closest car we found is Hyuindai Electric Red  (not 100% but almost there) , took years and 1 guy took a gamble to share with us all.

      So i am not sure which Korean car would use the same paint as your frame.

      Bodyshop was the way to do it.  They needed the bike with them to match paints (or try to)

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

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