First bike carb Help!

Discussion in '1st & 2nd Generation 1983-1989' started by Musicman333, Mar 13, 2019 at 5:17 PM.

  1. Musicman333

    Musicman333 New Member

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    Hi everybody! First post! I just recently acquired my first bike. A 1986 Vf500f (ca) with 8700 miles on the clock. This is the bike i wanted since freshman year high school so i bought it. A couple questions though. Its been sitting for 10 years. Seller started it right up with starter fluid......yikes! I am currently disassembling the carb and i noticed the previous owner capped off all emission lines, turned the pilot screws all the way in with loose bolts scattered throughout. Does anyone know which vacuum diapgraghms go to which carb and which emulsion tubes go where?

    Im disassembling one at a time but judging by the condition of the carb im afraid the prev. Owner might have mixed em up. Thank you!!
     
  2. Terry Smith

    Terry Smith Member

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    The OEM manual I found states #90 mainjets front and rear UNLESS you're in CA in which case an 86 would be #95 front and #92 rear. Pilot screw initial opening should be 2 1/2 turns out (then follow the idle drop method to fine tune). Jet needles should all the same (2VB).

    I owned a VF500 brand new back in the day, still have very fond memories of that. Good luck with your restoration. Bet you've got clogged pilot jets, these things are really tiny and clog easily.
     
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  3. Musicman333

    Musicman333 New Member

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    Thank you Terry Smith! I'm really hopeful for it! Since the previous owner capped off the EVAP/PCV system. What should I do with that black tube coming out of the carb in the center between the fuel ports? Should i cap it?
     
  4. Captain 80s

    Captain 80s Insider

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    Sounds like you are describing the primary vent tube. Do not cap it. It should just point down so no debris can enter. The right rear carb normally has a little holder attached with one of the diaphragm cover screws to direct it downward.
    [​IMG]
     
    Last edited: Mar 14, 2019 at 11:38 AM
  5. Musicman333

    Musicman333 New Member

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    Interesting...... The rear mains are at 105 and the rear at 108.....
     
  6. squirrelman

    squirrelman Member

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    what does it say in the service manual, eh ? :Bounce:the rear and the rear ?? too confusing
     
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  7. Musicman333

    Musicman333 New Member

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    LoL it would help to proof read 105 FRONT, 108 rear it has some sort of 4-1 full length exhaust on it. That's a little big though no?
     
  8. squirrelman

    squirrelman Member

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    no one knows, you determine using science.
     
  9. Captain 80s

    Captain 80s Insider

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    Not nessesarily for a FULL exhaust system.
     
  10. Captain 80s

    Captain 80s Insider

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    Like reading your plugs after getting your carbs back from Squirrel.
     
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