No power 1990 VFRF 750 RC36

Discussion in '3rd & 4th Generation 1990-1997' started by berbalov, Oct 7, 2018.

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  1. berbalov

    berbalov New Member

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    Hi Guys,

    I bought this bike 3 weeks ago with 33.000 miles on the clock. It got a new battery when i bought it and since then i drove like 300 miles with it. Today i drove it and after 5 mins of driving it there was no engine power, it went off. Now when i try to start it, the startermotor tries but it only gives a sound of working for half a second, and then it stops. There is power on the battery, horn, lights and all electrics function. '

    My dad says its a problem with the dynamo but i have litteraly no clue.

    Anyone familiar with this?
     
  2. Terry Smith

    Terry Smith Member

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    Maybe have a look at the 30A main fuse, could be corroding or melting. I'd also look at the battery connectors and the earth strap and check they are clean.
     
  3. squirrelman

    squirrelman Member

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    connections under the starter relay plug need checking too as they sometimes go bad from corrosion and heat.

    12-1-17 098.JPG
     
    Last edited: Oct 7, 2018
  4. berbalov

    berbalov New Member

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    Those look fine but maybe this color of the right wire is a problem? Looks toasted or something. I also tried with a different 30a fuse and the same happens when trying to start the engine.
     

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  5. berbalov

    berbalov New Member

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    This is the sound i get when starting:

     
  6. squirrelman

    squirrelman Member

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    yes, the right side wire looks like a repair was attempted, extra crimping is a sign.

    you can bypass it with a jumper cable for testing. hook jumper between that terminal and starter motor terminal.
     
    Last edited: Oct 8, 2018
  7. berbalov

    berbalov New Member

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    I tried to start the engine with the jumper cables connected to the car. Then it starts fine. I leave it running, but then when i take the jumper cables off, it dies in a second.
     
  8. squirrelman

    squirrelman Member

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    the wire you bypassed needs replacement or cleaning at both ends.
     
  9. berbalov

    berbalov New Member

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    I found the cause. The voltage regulator was totally blown out of shape. Now the only question i have left is if the stator is hurt because of it:Eek:
     
  10. squirrelman

    squirrelman Member

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    ez to test stator AC output.
     
  11. berbalov

    berbalov New Member

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    will try tomorrow. Thanks a lot for all the help for now :D
     
  12. berbalov

    berbalov New Member

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    Stator was still in good shape. Installed the new stator rectifier, it needed a good charge but she's running again.
     
  13. Blackslide

    Blackslide New Member

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    Rectifier, rectifier and once again, rectifier.

    Since they all seem to be totally dodgy, one might think Honda 'shoulda, woulda, couda', fixed their wiring/connectors and installed a beefier rectifier, in a better spot... Like, in the nineties, not 2010 and onwards :/

    Riding on the storm
     
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