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Project FZR250 project

Discussion in 'Your 250cc Projects' started by neoncrypnid, Mar 1, 2020.

  1. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    Its really hard to get the smoke back in once you have let it out... Negative earth smoke is pretty hard to come by as well... I have only seen the Lucas Positive Earth smoke before.
    wire-harness-smoke-Custom.jpg
     
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  2. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    My jar of smoke ran out a few year's ago

    [​IMG]





    And a bit more info about smoke in wiring here-

    Positive ground depends on proper circuit functioning, which is the transmission of negative ions by retention of the visible spectral manifestation known as "smoke". Smoke is the thing that makes electrical circuits work. We know this to be true because every time one lets the smoke out of an electrical circuit, it stops working. This can be verified repeatedly through empirical testing.

    For example, if one places a copper bar across the terminals of a battery, prodigious quantities of smoke are liberated and the battery shortly ceases to function. In addition, if one observes smoke escaping from an electrical component such as a Lucas voltage regulator, it will also be observed that the component no longer functions. The logic is elementary and inescapable!

    The function of the wiring harness is to conduct the smoke from one device to another. When the wiring springs a leak and lets all the smoke out of the system, nothing works afterward.

    Starter motors were considered unsuitable for British motorcycles for some time largely because they consumed large quantities of smoke, requiring very unsightly large wires.

    It has been reported that Lucas electrical components are possibly more prone to electrical leakage than their Bosch, Japanese or American counterparts. Experts point out that this is because Lucas is British, and all things British leak. British engines leak oil, British shock absorbers, hydraulic forks and disk brake systems leak fluid, British tires leak air and British Intelligence leaks national defense secrets.

    Therefore, it follows that British electrical systems must leak smoke. Once again, the logic is clear and inescapable.

    In conclusion, the basic concept of transmission of electrical energy in the form of smoke provides a logical explanation of the mysteries of electrical components especially British units manufactured by Joseph Lucas, Ltd.

    And remember: "A gentleman does not motor about after dark."

    Joseph Lucas "The Prince of Darkness" 1842-1903
     
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    Last edited: Jun 8, 2020
  3. neoncrypnid

    neoncrypnid Well-Known Member Premium Member

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    Sounds like very sound logic to me. I'll have to save that for future reference and to educate my mates.

    Guess its time to crack out the multimeter
     
  4. neoncrypnid

    neoncrypnid Well-Known Member Premium Member

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    So the culprit turned out to be the circuit breaker. Fried the whole thing. It measured like 15M ohms and rattled when i shook it. Replaced with a 15 dollar fuse holder and 20A fuse. The hunt for the short continues...
     
  5. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Where was the circuit breaker fitted?
    You should only have the 4 plastic fuses in the fuse box (plus 2x spare's)

    [​IMG]
     
  6. BlueDragon

    BlueDragon Well-Known Member

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    yamaha.jpg PureSports.jpg

    Your stickers are coming along. Taking me a while to clean up the lettering from the scans of the originals.

    I hope to have the EXUP and FZR ones done this weekend sometime and will print out the other Yamaha ones as well.

    The FZR ones will be a little more tricky as they will have the silver background to get lined up as well.

    Pics are before I put the transfer tape over the top.
     
    Last edited: Jun 13, 2020
  7. neoncrypnid

    neoncrypnid Well-Known Member Premium Member

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    Breaker was the main one coming off the positive battery terminal. I think the 2KR only have a main fuse, hard to be certain with the japanese manual but if it was ever there its not any more.

    Those stickers are a work of art BlueDragon, looks brilliant.

    Working theory currently is, since the wires were quite 'customised', when i repaired them back to stock I connected a high beam wire to the thermofan because the dirty wires looked black rather than blue/black. Then when I revvved it, stator chucked out more power, enough to blow some things up. Spent 2 hours with a multimeter checking every wire i could and thats the biggest suspect
     
  8. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    reg/rectifier check?
    What's it's voltage output @ 5KRPM - should be very close to 14 volts
     
  9. neoncrypnid

    neoncrypnid Well-Known Member Premium Member

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    I'll fire her up tomorrow and check
     
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  10. neoncrypnid

    neoncrypnid Well-Known Member Premium Member

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    Once again, my money and time got distracted for a few weeks. Been rebuilding the dirt bikes shock and linkage.
    So bike starts well now, but cylinder 4 is giving me some problems. It can run, it just chooses to come and go.
    I checked the jets and they were clean as, plug looks good too. I did some googling and tried swapping caps with cylinder 3 and that seemed to help. Tried the spray bottle on headers and after a few mins they were all hot, except 4 which was definitely cooler.

    Anyway, got it revving nicely and I made a short clip. Would be great if anyone can hear if theres any problems...
    new link
    Excuse the messy, too-small shed
     
    Last edited: Jul 5, 2020
  11. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    The video has no sound for me ?
    There's no speaker on the bottom right of the video with enable/disable ?
     
  12. neoncrypnid

    neoncrypnid Well-Known Member Premium Member

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    Sorry ill fix that now

    new link
     
  13. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    So are all the spark plug's firing and it idle's good ?

    If not, have you checked the resistance through the the spark plug cap's ?
    unsecrew them off each lead and test the Ohm's, use the 20K Ohm's setting on you DMM
    They should read around 10,000 Ohm's if they're good
    If not they may have corrosion inside them
    Also have you ever trimmed back the coil lead's (10mm is usually enough), this give's the screw in the spark plug cap fresh wire to screw in when you reasseble them
    But before cutting make sure they'll still reach if you cut them back
     
  14. neoncrypnid

    neoncrypnid Well-Known Member Premium Member

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    Righto checked all the caps and one was cactus. Read around 6M ohm. Rest were around 8.5-8.9K ohm. I'll add the cap to the list of things to replace, but also the cylinder it was on was not number 4 and fired fine. Any other ideas? Also battery voltage is too high at 5Krpm, about 18v but I'll look into that after this
     
  15. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Your reg/rec is cactus and it will fry your TCI unit. Thread on this forum about upgrading it.
     
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  16. neoncrypnid

    neoncrypnid Well-Known Member Premium Member

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    Sounds about right for this bike, what with it being an electrical component. Is it the FZR add-ons thread?
    Did a shuffle of the caps and still not firing consistently. Im looking at the carbs again now since carbie cleaner makes it fire
     
  17. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Do not run the bike until you sort out the charging system
     
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  18. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    As already mentioned look into this first !
     
  19. neoncrypnid

    neoncrypnid Well-Known Member Premium Member

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    Since the battery is pretty beefy, could i just disconnect the reg/rec and recharge after use? Thanks for the warning
     
  20. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Yes, it will run for a while.
     

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