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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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    GreyImport, Dec 6, 2013
    #381
  2. willfzr2503ln

    willfzr2503ln Active Member

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    your dead on the money about the engineers gray they do it all for a reason , tried and tested many many times , i have tested alot of things on my fzr to get to the conclusion i got to ( floats being out) bypassing the fuel pump was one of them i thought it helped but no the bike soon flooded shortly after ,
    a sure fire way to know at the cost of some cca power from your battery is when it wont rev , hold the starter on no throttle untill it runs (assuming your idle is set right) should burn of the excess and rev up every time
     
    • Like Like x 1
    willfzr2503ln, Dec 6, 2013
    #382
  3. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    You know Ive been thinking about the float heights thing.
    To be honest I cant remember what I did when I rebuilt the carbs..... its possible Ive forgotten to set the heights during the mad scramble to get them going or set them wrong. :cool:

    Now the bike has sat for a couple of days and last attempts to start it was a very rough 'idle only' thing happening.

    So I just went out to test your theory ..... no choke , no throttle ...... started first go and revved like a bought one.


    I need a holiday :headbang:
     
    GreyImport, Dec 6, 2013
    #383
  4. Murdo

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

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    Will you have it ready for Bunnings this Sunday?
     
    Murdo, Dec 6, 2013
    #384
  5. risky

    risky risky

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    risky, Dec 6, 2013
    #385
  6. willfzr2503ln

    willfzr2503ln Active Member

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    Good news about it reving up . I have gotten away with my floats being out for a while now .just have bad milage but very soon ill be viton seals and rebuilding my carbs .
     
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    Last edited by a moderator: Dec 6, 2013
    willfzr2503ln, Dec 6, 2013
    #386
  7. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Doubt it ..... I wouldnt trust it to get to the corner shop
    Even if I get into it t/m I cant test ride it beforehand.

    Also its still out of rego ..... but then again so is my van ... :oops:

    Just bought some :thumb_ups:
     
    GreyImport, Dec 6, 2013
    #387
  8. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    So 4 hours later I come out to try it ..... 'idle only' again ..... so off with the helmet and seat and grab the multimeter.

    Start it with the multimeter on it and it starts normally and revs ...... :commando:

    Back on with the seat and helmet and a spin up the street ...... and do I make it back? ..... wait for the gripping end of this blockbuster.....


     
    GreyImport, Dec 6, 2013
    #388
  9. willfzr2503ln

    willfzr2503ln Active Member

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    let me guess, as it drops down to idle suddenly . it stalls
     
    willfzr2503ln, Dec 6, 2013
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  10. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Well it didnt then cuz I reved it as I pulled the clutch in to u turn but in the past I would say yes.
     
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    GreyImport, Dec 6, 2013
    #390
  11. Phil

    Phil Senior Member Contributing Member

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    Blockbuster, I think not.
     
    Phil, Dec 7, 2013
    #391
  12. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Well we may have made a promising breakthru ..... fuel levels in the bowls are way way too high.
    Couldnt check #2 as it has no drain plug (why, I have no idea)
    I didnt get any further as I guess it will be off with the carbs and backtrack a little ..... and a mate turned up so we sat and looked at the bike and drank beer for 4 hours..... as you do.
     
    GreyImport, Dec 8, 2013
    #392
  13. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    Define too high - the height is meant to be 10.5mm above the line on the carb bowls

    peace out
     
    ruckusman, Dec 8, 2013
    #393
  14. willfzr2503ln

    willfzr2503ln Active Member

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    its common in the old fzr s
     
    willfzr2503ln, Dec 8, 2013
    #394
  15. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Hi Mr Grey,
    That supplement that I posted up for the 3LN1 shows what appears to be 9.2mm. I have no idea where that is measured from. By all means they should be set correctly; however I seriously doubt that running too rich would cause your problems. I still believe we have to go with the logical choice that links up with Ruckus' findings. electrical and related to the control unit/ fuel pump.
    cheers
    Blair
     
    maelstrom, Dec 8, 2013
    #395
  16. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Well Ive never read a straight answer yet to the best fuel height / float height measurement thing .... or the best way to do it thing.

    I remember someone saying that they had the level to the line and it was running perfect.

    But anyway , I havnt done it with accurate measurements yet but 2 of them were probably 20mm above the line ...if thats possible!

    I pulled a plug the other day and it was 'black'.

    EDIT: yea I still intend to delve into the other 'options' :thumb_ups:
     
    GreyImport, Dec 8, 2013
    #396
  17. willfzr2503ln

    willfzr2503ln Active Member

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    grey having the same problem myself and having measured my floats knowing there out
    if burning off the excess fuel the way i do allows you to rev it up every time (more so after it wont rev up)
    then its all most certain the floats are allowing to much fuel in causing it to flood , having said that if you think the float measurement you took is overly excessive then you may have a broken or worn rubber needle thing that the float pushes up to stop the fuel coming in .
    id say doing the floats then a balance will be all you need
    you have the viton seel kit right
     
    willfzr2503ln, Dec 8, 2013
    #397
  18. willfzr2503ln

    willfzr2503ln Active Member

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    http://fzr250.com/viewtopic.php?f=20&t=1487
    this is the best how to floats i have read
    until just now i have never seen anyone say on the line is right but it would make sense wouldn't it i mean that's what a line on something is generally for , fill to the line ect
     
    willfzr2503ln, Dec 8, 2013
    #398
  19. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    I made a jig to measure mine - I'll take photos of it, it's an easy process, but the carbs will have to removed - yet again...

    I was fortunate that mine were all on spec, but I had to measure them before refitting to know that for certain

    peace out
     
    ruckusman, Dec 8, 2013
    #399
  20. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    Thta
    That's the jig I made and it worked really well, though I didn't have the right angle bend in the tube I still got meaningful measurements

    Mine all came in at 10.5mm above the line
     
    ruckusman, Dec 8, 2013
    #400
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