1986 Honda VFR burnt wire

Discussion in 'Mechanics Garage' started by gwan2cruz, Oct 9, 2022.

  1. gwan2cruz

    gwan2cruz New Member

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    I have a 1986 Honda VFR 700 that someone soldered the wires for the burnt stator to R/R connector. They soldered the green and red and a black wire all in one "clump". Should I separate them individually and solder them? The black wire was added in there as well and not sure why it is in the "clump" or is it needed at all as it is completely burned.

    Thank you
    Gary
     
  2. Terry Smith

    Terry Smith Member

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    upload_2022-10-10_10-5-53.png
    This is the picture from the service manual. Sounds like you have a different RR fited with different wire colours.
     
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  3. gwan2cruz

    gwan2cruz New Member

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    Thank you Terry for the diagram, this will help to see what colors were changed.
     
  4. squirrelman

    squirrelman Member

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    the RED (hot) wire MUST NOT be connected to either green or black wires (grounds) or disaster will result. :(
     
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  5. gwan2cruz

    gwan2cruz New Member

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    Thank you squirrrelman for the information, the previous owner twisted both the red wire and green wired all together with the black wire and the black wire is completely fired. I guess I will have to start with the regulator and work toward the battery. I am concerned the stator is probably fired as well. The bike has just 22,xxx miles on it.
     
  6. gwan2cruz

    gwan2cruz New Member

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    Update squirrrelman, I was mistaken the red wires were NOT soldered with the green ones, however the the green ones were spiced together and soldered as one big "clump" with a black wire. They were also soldered after the stator and before the plug in adapter which is still in place and not melted at all. Thanks for all the help.
     
  7. airwalk

    airwalk New Member

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    Some black wires(most) on reg/react are voltage sensing & consequently should be connected to a 12V source somewhere on the bike, often the ign switch. Other RR types have black as a ground connection so you need to know what kind is on there in order to hook up right, standard very 700 setup didn’t even have a black sensing wire as per earlier provided diagram...
     
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  8. gwan2cruz

    gwan2cruz New Member

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  9. Terry Smith

    Terry Smith Member

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    Sounds like you have a non-OEM RR; this is not necessarily a problem except the wire colours don't correspond to the service manual. I have atached the Electrosport fault finding document which has some useful info on the various wire colours and how to test.
     

    Attached Files:

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  10. gwan2cruz

    gwan2cruz New Member

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    Thank you for the diagram, it looks like this black wire was an after thought and was put on by mistake to the wrong post of the battery and got fried.
     
  11. 50th VFR

    50th VFR Insider

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    Below is link to VFR750 86/87 manual.

    Will help with stator checks etc

    This covers rest of world RC24. US got a sleeved down 700 engined version as import restrictions banned import of larger engined motorcycles to protect (at time) ailing domestic motorcycle industry.

    https://www.carlsalter.com/download.asp?p=1872
     
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  12. gwan2cruz

    gwan2cruz New Member

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    Thank you 50thVFR , that will be helpful.
     
  13. Captain 80s

    Captain 80s Member

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    The VFR700F was not "sleeved down", it was de-stroked. Both motors share a 70mm bore. Doesn't really matter in this conversation, I know. And it wasn't a ban, it was a hefty tariff. You could still buy 750cc and larger machines.
     
  14. Terry Smith

    Terry Smith Member

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    Clever work by Honda. I think they just changed the crank (shorter throw) and rods (longer) to make the 700. I owned a couple in the 80's and they weren't noticebly different from the 750 to a road rider.
     
  15. Captain 80s

    Captain 80s Member

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    What's also interesting is that the pistons are different even tho they are both 70mm. I read somewhere a while ago that some club racers were putting 700 pistons in their 750s for a compression ratio bump.
     
  16. Terry Smith

    Terry Smith Member

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    Actually that makes sense. If the combustion chambers were the same size, the compression ratio on the 700 would be lower ,as the swept volume is smaller due to the reduced stroke. So to keep the CR up, the combustion chamber would need to be smaller on the 700, and using the same piston in a 750 would give a CR boost. I was bored so I did the maths, the 700 piston in the 750 would give a CR that rose from stock 10.5 up to 11.24.

    And now back to your scheduled programming...
     
  17. Captain 80s

    Captain 80s Member

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    Yeah... Sorry OP
     
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  18. squirrelman

    squirrelman Member

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    brilliant ! :cool:
     
  19. 50th VFR

    50th VFR Insider

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