2008 GV125C headlight/running issue

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This topic has 4 replies, 3 voices, and was last updated 8 years, 4 months ago by ♠️ M77.

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- Jun 14, 2018 at 8:59 PM #1259
  
  Brent
  Participant
  
  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!
- Jun 15, 2018 at 5:59 PM #1277
  
  Daniel
  Participant
  
  Hi,
  
  Have you check your battery voltage ? At low regime, it must show 14 V. If not, either alternator or regulator might be damaged.
  - Jun 16, 2018 at 2:43 PM #1283
    
    Brent
    Participant
    
    Battery voltage is fine and have replaced regulator.
- Jun 16, 2018 at 4:42 PM #1284
  
  Daniel
  Participant
  
  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.
- Jun 16, 2018 at 9:25 PM #1293
  ♠️ M77
  Keymaster
  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!
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Posts

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FORUM ARCHIVE: Boards are now read-only as archives. For bike service manual downloads, parts shop, or to read more about the forum changes, tap here to read more....

This topic has 4 replies, 3 voices, and was last updated 8 years, 4 months ago by ♠️ M77.

Viewing 3 reply threads

Author

Posts
- Jun 14, 2018 at 8:59 PM #1259
  
  Brent
  Participant
  
  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!
- Jun 15, 2018 at 5:59 PM #1277
  
  Daniel
  Participant
  
  Hi,
  
  Have you check your battery voltage ? At low regime, it must show 14 V. If not, either alternator or regulator might be damaged.
  - Jun 16, 2018 at 2:43 PM #1283
    
    Brent
    Participant
    
    Battery voltage is fine and have replaced regulator.
- Jun 16, 2018 at 4:42 PM #1284
  
  Daniel
  Participant
  
  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.
- Jun 16, 2018 at 9:25 PM #1293
  ♠️ M77
  Keymaster
  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!
Author

Posts

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