Forums 🚥 PIT STOP 🔧 Hyosung Technical Help 2008 GV125C headlight/running issue

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    • #1259
      Brent
      Member
      • Topics: 1
      • Replies: 1
      Joined:
      May 11, 2018
      @curryundies
      Clwyd
      GV125 Aquila
      Points: 35

      Bike runs fine with no lights or side/parking light on, but when headlight main beam turned on bike slows down or struggles to top 50mph. Was previously much worse (struggled to reach 40mph) until upgraded RR. Suggestions/help, please!

    • #1277
      Daniel
      Member
      • Topics: 3
      • Replies: 11
      Joined:
      May 11, 2018
      @daniel
      France
      Aquila 650 EI
      Points: 123

      Hi,

      Have you check your battery voltage ? At low regime, it must show 14 V. If not, either alternator or regulator might be damaged.

      • #1283
        Brent
        Member
        • Topics: 1
        • Replies: 1
        Joined:
        May 11, 2018
        @curryundies
        Clwyd
        GV125 Aquila
        Points: 35

        Battery voltage is fine and have replaced regulator.

    • #1284
      Daniel
      Member
      • Topics: 3
      • Replies: 11
      Joined:
      May 11, 2018
      @daniel
      France
      Aquila 650 EI
      Points: 123

      If you are sure that the new regulator works well, you should check the alternator. The battery is only use for starting and after, the regulator provide the power required for the operation of the engine and accessories.

    • #1293
      ♠️ MARCEL
      Administrator
      • Topics: 38
      • Replies: 290
      Joined:
      May 11, 2018
      @mf448kxn6
      North UK
      GTR
      Points: 3,423

      Hey,

      As Daniel says too, I have my suspicions on the regulator.  How about this, what i’m about to say is direct of the workshop book I have been reading…

      1. Start the bike, Rev to 2.5 – 3,000 rpm.  It “MUST” say  14.5 or over
        Any 13v readings whatsoever = The regulator needs inspecting/replacing.
        OEM rating = 14 – 15 (15v best)
      2. What lights do you have ? – main headlight bulb must be 55w max  (Some OLDER GV bikes need 35w instead)
      3. Depending on your model – If there is a “HYOSUNG” 30/20A relay on it, inspect that one too.   I know it’s on ALL GTR bikes to power their dual lights.
      4. Battery will be 12.8volts when bike is OFF (charged)
      5. Switch on the bike -> Don’t start -> Put All lights on.  The battery must not DROP by 1 volt.   (12.8 dropping to 12.6 is normal)

      Let us know how you get on!

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

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