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Project My Fizzer

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

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  1. Willrcr15

    Willrcr15 Well-Known Member

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    We just spent a frustrating weekend trying to get the carbs on a gsxr to work. But it's a worked race engine & we know little about the mods. On the diaphram side of things, with all the many times taking the tank off & on & airbox & carbs, we forgot to connect the cap vent tubes, which I think on the fizzers will be the vent tubes, and in doing so the vacuum pressure was lost to the atmosphere & hence no lift of the slides well very little anyway & she ran like a dog, slow struggle to rev & no pull power at all, impossible to reach 9rpm out of 13K. We actually wasted 1/2 a day till we realized what we had done & then we got on with it, still not right yet though, jetting up & down & fouling plugs & forgetting to connect the vacuum hose to the fuel tank tap, fouling plugs again, enough to drive you to drink.
    So anyway check that those one way valves aren't leaking causing loss of vacuum hence lift of the slides to varying degrees.
     
    Willrcr15, Mar 10, 2014
    #661
  2. Phil

    Phil Senior Member Contributing Member

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    Have done exactly the same thing whilst balancing the carbs. Promptly put the tank back on and tried it out just to be sure, not good. Looked on the ground and saw the 4 rubber caps, put them on and she ran perfectly, my bad.
     
    Phil, Mar 10, 2014
    #662
  3. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Hi fnq_fzr,
    Great job at the island. You mean a tooth or two less on the rear sprocket.
    Can you tell us what size did you end up using for your float seat o-rings.
    Also with regard to the ones that you replaced, were they new genuine parts?
    I will have some thicker ones available for the 250's shortly and any extra information on this would be useful.
    cheers
    Blair
     
    • Like Like x 1
    maelstrom, Mar 10, 2014
    #663
  4. Revolver

    Revolver Big Member Premium Member

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    Here here!
     
    Revolver, Mar 13, 2014
    #664
  5. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    I'd love to know what the fuel level is..? ;)
     
    ruckusman, Mar 13, 2014
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  6. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    The only thing I did was swap carbs ... everything else is equal.
    Im going to also try those other carbs (from Chris) just for curiosity.

    Im not going to touch the working carbs as much as Id like to see what jets etc are there but I will do the external fuel levels.

    The #1 slide moves freely by hand, equal to the others.
     
    GreyImport, Mar 14, 2014
    #666
  7. Th3_Huntsman

    Th3_Huntsman Senior Member Contributing Member

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    you're so close mate!
     
    Th3_Huntsman, Mar 14, 2014
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  8. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    I had a link somewhere to reasonably priced diaphragms - let me know if you need to replace one.

    It would be great to know the fuel levels considering all of the consternation we've been through over that one issue

    peace out
     
    ruckusman, Mar 14, 2014
    #668
  9. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    GreyImport, Mar 14, 2014
    #669
  10. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    • Like Like x 1
    ruckusman, Mar 14, 2014
    #670
  11. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    Done the valve clearances yet? Could be the reason for the slide not lifting.
     
    Murdo, Mar 24, 2014
    #671
  12. Th3_Huntsman

    Th3_Huntsman Senior Member Contributing Member

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    It runs perfect with a different set of carbs so that should rule that out?
     
    Th3_Huntsman, Mar 24, 2014
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  13. risky

    risky risky

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    nah, with grey,s luck it could be a stone chip.lol
     
    risky, Mar 24, 2014
    #673
  14. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    Have you had a chance to do the fuel level?

    My fuel pump has arrived and I'm fitting it today so I'll be checking the fuel level also...

    peace out
     
    ruckusman, Mar 29, 2014
    #674
  15. fnq_fzr

    fnq_fzr Active Member

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    Thanks Blair. Yep. A tooth or two less on the rear sprocket. Always get it round the wrong way. :(. The O-rings I can't be sure about. They were not genuine items though. They fixed up some flat spots I was having...
     
    fnq_fzr, Apr 1, 2014
    #675
  16. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Hi Mr Grey,
    Someone on the 400 GreyBike forum had the same thing happening as you on their VFR. Turns out that the fuel tap vacuum takeoff is for that cylinder and the hose was split.
    http://www.400greybike.com/forum/viewtopic.php?f=22&t=46516
    I don't know if the Fizzer has the same setup for the fuel tap but thought it might be worth mentioning.
    cheers
    Blair
     
    maelstrom, Apr 6, 2014
    #676
  17. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    On the topic of the o-rings for the float valve seat:
    There has been one stuff up after another resulting in continuous delays. However, I should have the exceptionally large optional o-rings (7.50 * 2.00 a standard metric size) in stock next week and they will be added to all 250 Yamaha kits as an 'extra'.
    I will also make a video to show how they fit, or don't fit, in a BDST carb that has the correct tolerances. Then I will post a set to all 250 customers along with instructions.
    There has not been enough conclusive evidence yet regarding this but there is enough information, from members on this forum and other sources, to suggest that some 250s do not create a firm fit with the standard size o-ring. As such, it is not acceptable to supply an o-ring that might not be tight enough for such a critical application, and that is regardless of whether or not it is affecting the running of the engine.
    cheers
    Blair
     
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    maelstrom, Apr 23, 2014
    #677
  18. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Today on the Fizz

    Double demerits ? ... blah blah blah

    Fizz 1.jpg
    Fizz 2.jpg



    And if you look closely at this photo u will notice the fuel cap open ...... no prizes for guessing why :cool:
    Phil ... you are banned from commenting :D

    Fizz 3.jpg





     
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    GreyImport, Jun 8, 2014
    #678
  19. kiffsta

    kiffsta Senior Member

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    Sounds good mate, great see you out on the road


    Sent from my iPhone using Tapatalk
     
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    kiffsta, Jun 8, 2014
    #679
  20. Phil

    Phil Senior Member Contributing Member

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    Mr. Grey
    Unlike a good bottle of red wine that requires opening and allowed to breath........... your bike does not :lolsign:
    Ok the bike sounds great........... The black Alfa looks great...........The rider, well that's another story.:thumb_ups:
    Good to see you burning up the bitumen....... The man has a need, a need for speed :neo:
     
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    Phil, Jun 8, 2014
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