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Project My Fizzer

Discussion in 'Your 250cc Projects' started by GreyImport, Sep 24, 2012.

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  1. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    And I forgot to mention the idle knob is completely backed off .... its not even in contact with the throttle
    ... and the butterflies are totally SHUT
     
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    GreyImport, Mar 16, 2022
    #1101
  2. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    That's an air leak from somewhere then - manifolds on tight + choke circuit
     
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    ruckusman, Mar 16, 2022
    #1102
  3. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    I have a new set of intake manifolds Ill put on

    But I wonder though if this "damage" is the culprit

    carb damage.jpg
     
    GreyImport, Mar 16, 2022
    #1103
  4. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Just looking at these other spares and they have similar damage on all 4
    Must be from people putting them in a vice?

    My original set have nothing like that and are perfectly round

    IMGP0259.JPG
     
    GreyImport, Mar 16, 2022
    #1104
  5. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    The flat spot is interesting, but thinking on it, that's past the lip on the manifolds, it shouldn't affect the seal with the boots

    Air is getting through somehow and the idle circuit via the merge bung which is past the butterfly

    It's not heaps as it doesn't take much to get it to rev that high out of gear, it does rev that ~high when it leans out running out of fuel because the fuel tap is turned off - how would I know that...

    Idle mixture screws washer/o-rings right way around?

    Only other thing I can think of downstream of the butterflies is the butterfly shaft seals, but that is an outside chance as those shafts themselves are a pretty snug fit into the carb body
     
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    ruckusman, Mar 17, 2022
    #1105
  6. jmw76

    jmw76 Well-Known Member

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    The fact that it revs up as the fuel runs out, implies that it is running rich at idle. Try adjusting the idle mixture screws and resetting the idle speed.
     
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    jmw76, Mar 17, 2022
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  7. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    So pulled off these carbs and they are leaking fuel everywhere with a little sitting in #3
    I had no new float needles so Im not surprised

    My next move was to go back to the original carbs and change the experimental needle jet holders for the "old" ones that were on these ... I think they are Keysters
    Sorry to say Mr @maelstrom , these were the problem :D
    I thought they were maybe to blame as soon as I originally saw the "jittery" slides

    She starts, idles and revs now but big test will be under load on the road ..... I think I might wait till high school and TAFE going home time is over ..... they are both at the top of my street :crazypilot:
     
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    GreyImport, Mar 17, 2022
    #1107
  8. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Well it got up the road but still has the old 'no rev' problem intermittently that used to plauge it when it was my road bike :idk:
    Motor is pushing 32yrs old with no internal maintenance so cant complain too much

    Video has some lulls in it but I couldnt be bothered editing :thumb_ups:


    DSC_0204.JPG


     
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    GreyImport, Mar 17, 2022
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  9. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    XLNT work on the troubleshooting

    Formula 1 sound on the first takeoff

    I think the difficulty starting is lack of back pressure due to no EXUP - the cams are tuned for high RPM, EXUP makes it usable at low RPM

    Officer: Rider, is that vehicle legal and registered for road use?

    Rider:...

    How old [Kms travelled] are those Keyster emulsion tubes?
     
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    ruckusman, Mar 17, 2022
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  10. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    EXUP is still on it .... I did shorten the headers but not by much , just to get the endpipe coming out from under the middle

    Id have to look back on this thread to see when I put in those tubes .... I think not too many Ks

    I did have a good look for the HP ..... they hang out alot at times because everyone rips up and down here ... especially the P platers from TAFE and the high school seniors

    The exhaust is louder than last mod .... I think Ill be using some ear plugs :Drool:
     
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    GreyImport, Mar 17, 2022
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  11. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    I like the loud exhaust as it's the full F1 experience

    Even the Police dislike [loathe] the highway patrol, they're a special breed of their own

    OK, so the EXUP isn't the reason it won't idle/start easily, perhaps it just needs mixture screw & idle adjustment as a first step

    Revs out fine which is what you need
     
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    ruckusman, Mar 17, 2022
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  12. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    I'm guessing the COP setup is still on the bike, so compression test?
     
    Frankster, Mar 17, 2022
    #1112
  13. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    No worries that's why field testing was invented. If I ever get a fizzer I will be able to do medical experiments and see what is going on.
     
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    Last edited: Mar 18, 2022
    maelstrom, Mar 18, 2022
    #1113
  14. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    This bike just hates me .... I got stuck loading it halfway on ..... going back it would have toppled over and I stood there for 10 minutes doing a balancing act and to get the strength to go forward
    The next thing on the shopping list is a camper / bike hauler with a low easy gradient ramp

    2900-SE-v5-Charcoal-and-black-50.jpg

    IMGP0263.JPG

    IMGP0261.JPG
     
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    GreyImport, Mar 18, 2022
    #1114
  15. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    The next thing on the shopping list is a camper / bike hauler with a low easy gradient ramp

    Good luck Chief. Hopefully, one of the 2fiftycc.com crew takes out the weekend. FZR looks nasty fast!

    BTW, I think @Murdo has a trailer like the one you're after.
     
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    Frankster, Mar 18, 2022
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  16. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Bike ran like a pig
    Erattic and unpredictable .... bit like the rider :D

    Highlight of the weekend was the first run .... lost the rear on takeoff and nearly took out the timing lights

    Breaking up around 14000rpm in each gear on WOT so maybe the TCI isnt keeping up with the COPs , among many other problems.

    Add in carbys , valve clearances , low compression most likely

    But I have a good solution that will solve all the issues in one go ....

    crushing-motorcycles-bicycles-an.jpg
     
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    GreyImport, Mar 21, 2022
    #1116
  17. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    Breaking up around 14000rpm in each gear on WOT so maybe the TCI isn't keeping up with the COPs

    That's weird. The dwell time on those COPs is bugger all, so maybe one of those Chinesium TCI units might be needed?

    If you have time before you throw the bike in the trash, maybe do a compression test and the valves to see what else might be causing your issues.
     
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    Frankster, Mar 21, 2022
    #1117
  18. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    compression and valves have never been done so thats def needed

    I have never changed the TCI (no idea why Ive not tried that back in the day)
    I have a boxful of spare ones
    And as Murdo and I discussed also , a China Charlie would be a good move .... they are on the CBRs
    Sadly though I can only find one for a 2KR (and for the ZXR , which Ill try on that bike)

    This bike has always been a PIA but whats bike life without a challenge ... certainly not boring :D



    IMGP0265.JPG

    IMGP0269.JPG
     
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    GreyImport, Mar 21, 2022
    #1118
  19. Frankster

    Frankster Grey Pride...Adventure before Dementia Staff Member Premium Member Ride and Events Crew

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    I have never changed the TCI (no idea why I've not tried that back in the day). Sadly though I can only find one for a 2KR (and for the ZXR , which Ill try on that bike)

    I don't have a wiring diagram, but would the 2KR TCI replacement be that different to the one on your bike currently? as long as the pickup pulses and the starting circuit is the same, the rest shouldn't really matter (in drag racing). Also, I'm pretty sure @Linkin ran a Chinesium TCI on his ZXR250C, so he could confirm the benefits he found over the stock TCI.

    This bike has always been a PIA but what's bike life without a challenge ... certainly not boring :D

    That's the spirit.
     
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    Frankster, Mar 21, 2022
    #1119
  20. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    GreyImport, Mar 21, 2022
    #1120
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