Attempted VF1000F2 resurrection

Discussion in '1st & 2nd Generation 1983-1989' started by Waylander, Jul 5, 2020.

  1. Diving Pete

    Diving Pete Member

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    I didn’t say no power - that’s the recovery part bit of it. A cdi that is in limp home mode just cuts power to the ignition and about 5500 is all you will get. You will be able to drive and start it..
     
  2. Waylander

    Waylander New Member

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    So if that’s the case, how do you get it back out of limp mode, to have to buy a another cdi off eBay with no guarantee if that might be in limp mode, seems a bit risky

    And a new one is more than I paid for the whole bike


    VF1000F2F, in bits
     
  3. Diving Pete

    Diving Pete Member

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    Yep that’s the problem...
    the CDi s are robust but let’s not kid ourselves these are over 30years old. Try and borrow one
     
  4. Waylander

    Waylander New Member

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    I have a parts bike, I have no info on it no title info, no number plate, and about 40% of it is missing

    But it does have a cdi, fuel pump (probably knackered), fuel cut off relay, engine and carbs, forks, brakes and a lot of other bits

    So I shall have all those bits off and test one at a time, see if I get anywhere

    I see cut off relays are £6 on eBay ordered a couple, 50% chance of one working


    VF1000F2F, in bits
     
  5. Waylander

    Waylander New Member

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    I have searched and searched, but cannot find any reference to limp mode or restricted RPM on a VF with carbs

    Have you any documentation on this anywhere, having built an interface to talk to my old Porsche I’m sure I could manage something to chat to the CDI


    VF1000F2F, in bits
     
  6. Diving Pete

    Diving Pete Member

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    watch this -

    The reason I'd look at this is due to having the exact same issue on my 400. - The old CDI's only controlled ignition and i think that your CDI is basically the same type.
     
  7. Waylander

    Waylander New Member

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    So a while ago I found a massive post on one forum or another explaining all the jets, locations and air passages

    Do you think I can find it a second time, nope

    So with the fuel pump permanently on with a jumper on, there appears to be no improvement, I would actually say it is worse

    It seems to just run out of fuel, if I turn it down hill and wait 2 mins it fires up and off you go

    I have checked and cleaned the petcock that seems clean, the tank was fully rust removed, I had a clear filter by the tank and there was nothing in that, I have checked all the fuel pipes and routing, the pump is working fine

    I can only assume I have an issue in the carbs, so I guess they are coming off again
    And I’m going to check all the fuel pipes and connectors

    I refuse to be beaten


    VF1000F2F, in bits
     
  8. Dannoxyz

    Dannoxyz New Member

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    1. Test source of petrol first. Remove fuel-hose from pump and aim into measuring cup. Apply vacuum to petcock and time 30-seconds with stopwatch. How much petrol did you collect?

    2. Next, measure same, except from output of fuel-pump. Apply vacuum to petcock and power to fuel pump. Time 30-seconds with stopwatch. How much petrol did you collect?

    3. Measure petrol in float-bowls. First, drain all petrol from all carbs so float bowls are empty. Close drains. Apply vacuum to petcock and power to fuel-pump. Time 30-seconds with stopwatch. Drain each float-bowl one at time into measuring-cup. How much petrol did you collect from each float-bowl? Are they all identical in volume?


    I had issue with my Ninja 250 race-bike that was similar. Started up just fine, idled and warmed up for 8-10 minutes just fine. Got onto track and at exactly 1-minute, 1/2-lap later, it would run out of petrol. Turned out I had vacuum hose to petcock that would get pinched when I lowered tank! Tracked down by installing rubber-T at petcock vacuum-port and measuring actual vacuum going to petcock. Found after initial amount to open petcock, vacuum would drop steadily until float-bowls ran dry.
     
    Last edited: Sep 14, 2020
  9. Terry Smith

    Terry Smith Member

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    The VF1000F manual that I have states 900mL +/-10% per minute. In 5 seconds that is 75mL, so your pump is fine.

    Sure does sound like you are running out of fuel though, if you can wait for a couple of minutes and re-start no problems.

    Is it possible to bypass the pump altogether and just let gravity (and a full fuel tank) do it's thing? My VTR1000F has no fuel pump and works this way. Maybe your fuel pump power supply has a break in it?

    Does your fuel tap have a vacuum shut-off? Is the tank air vent clear?
     
  10. Captain 80s

    Captain 80s Member

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    Or maybe your fuel pump is done like I mentioned.

    Also, when it is acting up, pop the cap and see if you get a rush of air in. Perhaps the cap is not venting and it's starving the fuel that way.
     
  11. Waylander

    Waylander New Member

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    Yes I checked the vent in the fuel cap and that’s working fine, I don’t want to fill the tank just in case, if there is any issue inside it

    I have tried gravity into a bowl and it seems to flow fine, just a bit confused by the pipe sizes, 7mm out of the tank, then 10mm down to the filter, with 11mm on the filter after the elbow, then 10mm to the pump and from the pump

    I had to buy some new hose (neoprene) as the PO had used the really thick walled R6 car hose and huge screw clips, all a mess


    VF1000F2F, in bits
     
  12. Waylander

    Waylander New Member

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    Well I hope to have the other parts off my donor bike later today, so tomorrow I can swap over the pump and filter and pipes, see what happens

    I’m still concerned that although I have cleaned the carbs with out splitting then, the PO was a major bodger and there might be something still stuck in there, I only took one off to get the new fuel tube in.

    I’m sure with the pump running all the time, if the floats were wrong it would flood he engine

    But it seems to be reasonable below 5K until you meet a hill of any sort


    VF1000F2F, in bits
     
  13. Diving Pete

    Diving Pete Member

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    Switch the cdi first, test, then the pump. Dumb question - what do the plugs look like.? are they new?
     
  14. Waylander

    Waylander New Member

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    Plugs are brand new and not crazy sooty, a little over rich but not mad

    I’m going to print out the factory list of jets and needles,

    As the guy I bought it off mentioned it was a bit off at high rpm

    So they might all have the wrong jets and needs and springs in the wrong holes


    VF1000F2F, in bits
     
  15. Diving Pete

    Diving Pete Member

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    so just to confirm - you have not removed the carbs from the bike?
     
  16. Waylander

    Waylander New Member

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    Not yet this time, but they been off 3 times now

    And just to confirm I have done 1 at a time never mixed up parts

    I had to remove one carb out of the bank to replace a broken and bodged plastic fuel pipe, documented back in this thread somewhere

    I do have another set of carbs off a VF1000F, but they have been sat with fuel in for more than 10 years, the tank is full of thick black molasses looking crap that stinks, so I think the carbs will need a hot ultrasonic bath


    VF1000F2F, in bits
     
  17. Diving Pete

    Diving Pete Member

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    ok, Ive started this thread back at the beginning. Pull the carbs and take a close look at the Main Jets - you may have some plugged.

    My reasoning is that you had the bike unused for a while & now upon recommission encounter possibly ignition / carb issues.

    If you have a spare CDI I'd swap it & test - if no difference, put the old one back & pull the carbs.

    Have you cleaned your tank?
     
  18. Waylander

    Waylander New Member

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    The tank was completely de rusted, with Bilt Hamber Deox C

    4 days of soaking with 20litres of the stuff in it

    [​IMG]
    Before
    After
    [​IMG]


    VF1000F2F, in bits
     
  19. Diving Pete

    Diving Pete Member

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    That is great news but still doesn't mean that crap is in the lines & fuel pump...
     
  20. squirrelman

    squirrelman Member

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    [QUOTE="Diving Pete, post: 618877, member: 32865"...... Pull the carbs and take a close look at the Main Jets - you may have some plugged. Have you cleaned your tank?[/QUOTE]

    c'mon, pete, he iddint dumb so of course he cleaned all jets during 3 carb pulls so it's gotta be something else, ya think sept 13 2020 001.JPG
     
    Last edited: Sep 15, 2020
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