1985 VF500F - Making it Run Again - Need advice!

Discussion in '1st & 2nd Generation 1983-1989' started by Tee-Dub, Oct 9, 2021.

  1. Captain 80s

    Captain 80s Member

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    Which "seals"? If they had the right crankcase off they might have disturbed the Pulsar Coils. I guess popping the Alternator cover off might be worth it too to eliminate. Plug wires routed to correct cylinders?
     
  2. Tee-Dub

    Tee-Dub New Member

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    I am confident that the wires were routed correctly as it idles ok.

    I will add to my list of things to check. Is that a wet compartment?
     
  3. Captain 80s

    Captain 80s Member

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    You'll get some drips / dribbles when you remove the cover. Normal. It has some passages around the crank area.
     
  4. Tee-Dub

    Tee-Dub New Member

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    OK so I don't need to drain the oil?

    Out of curiosity, what is the electrical cable that comes out of what I think is the clutch housing?
     
  5. squirrelman

    squirrelman Member

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    wires are for pulse generator coils. lean the bike against the right side and no oil will spill.
     
  6. sixdog

    sixdog New Member

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    Just out of curiosity did you check the jet sizes in carbs? Needles ( shimmend or not ) ... choke operation ?
     
  7. Tee-Dub

    Tee-Dub New Member

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    I mean on the right side.
    Yes I did. The main jets and needles are the stock sizes. Installed without shims, if that is the question...
     
  8. sixdog

    sixdog New Member

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    That is the question. hmmmm
    Fuel flow is good from the petcock?
     
  9. Captain 80s

    Captain 80s Member

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    If you are talking about removing the RIGHT crankcase cover with out draining the oil, yes you can. The side stand puts just about right. You can
    roll the bike on to a couple 1" chunks of wood for insurance.
     
  10. Tee-Dub

    Tee-Dub New Member

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    I have been using a funnel and spare fuel line. Fuel level up at the clutch lever height.
     
  11. squirrelman

    squirrelman Member

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    why not try a hot compression test ?
     
  12. Tee-Dub

    Tee-Dub New Member

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    That is on my list... THX
     
  13. Tee-Dub

    Tee-Dub New Member

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    OK been back at it. New battery for bike.

    I removed the coils to check them. They seem to be on the mark. I did notice the #3 plug wire cap didn't measure right. I disassembled/reassembled and it did measure good then.

    I truly believe that I have a float valve that is not closing all the way - or just leaking somehow. All the fuel left my funnel supply and I definitely didn't burn it. Went to turn it over and it felt locked up (like fuel filled the cylinder). Bike otherwise seemed to have more pop when it tried to start earlier.

    All that said, when I was putting the coils back together on the bike, and have some questions.

    1. Do both plugs fire at the same time on a coil?
    2. The coils have no + and - on them. Is there a positive and negative on the coil - B/W and Blue?, B/W and Yellow

    I have
    Top coil pair going to 1 and 3.
    Bottom coil pair going to 2 and 4.

    Black and white going to the rearward tab on the coils. Yellow on top, blue on bottom on the "front" spade connectors.

    Thanks, I am getting closer!
     
  14. squirrelman

    squirrelman Member

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    check for a wet plug to find the leaky needle. yes the coil primaries have a preferred polarity, so look at the wiring diagram. on coils black (or black and white) is ground. both plugs fire at the same time (wasted spark).
     
  15. Tee-Dub

    Tee-Dub New Member

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    Thanks. My issue is that the wiring diagram I have does not show the orientation of the + and - on the coil.

    Is it a safe assumption that if I had the polarity wrong it would not run at all?
     
    Last edited: Oct 19, 2021
  16. squirrelman

    squirrelman Member

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    no, i believe it will run with wrong polarity, but not run best. the terminals on the coils are color coded if you look carefully. you should have marked leads b4 you removed them.
     
  17. Tee-Dub

    Tee-Dub New Member

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    Found a pic I had taken before removing. Ground to the rear, Yellow on lower coil and Blue on top.
     
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