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Project My Fizzer

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

  1. TonyZXR

    TonyZXR Well-Known Member

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    Well that was a long read. Nice resto/repair. What have I learned ? fzrs are pretty interesting with their own unique little design quirks but their carbs absolutely suck haha
     
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  2. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    You sir are a master of understatement :D

    Carbs absolutely suck doesn't even come close, great bikes otherwise
     
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  3. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Todays big effort ....

    Small carb T piece filter picked up some junk

    IMGP1575 (Medium).jpeg

    Bit of bowl leakage

    IMGP1577 (Medium).jpeg


    Some Tygon goodness :D


    IMGP1586 (Medium).jpeg IMGP1584 (Medium).jpeg IMGP1583 (Medium).jpeg

    Before ....

    IMGP1571 (Medium).jpeg
     
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  4. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    You have to watch the bolt length for the fuel tap, too long and it can damage the barb for the fuel line
     
  5. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Yea I had to change the bolts as that one is brand new .... a 3LN1 tap is different .... the movable outlet is on the 'bottom' and goes to the filter

    IMGP1591 (Medium).jpeg
     
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  6. Mike Fulcher

    Mike Fulcher Active Member

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    Once again, I can't emphasize how important & informative spark plug READING is, it will tell you exactly how the engine has been running recently, & if you have a problem with a non starting or badly running engine the spark plugs will always tell you the reason why.
     
  7. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    It's an FZR250, the reason is the carbs.

    Keen to see the carbs come apart again... will there be some keyster goodness going in @GreyImport ?
     
  8. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Theres pics of them a few posts back .... let me know :D

    they are on the bench already .... I put keyster crap in ages ago ... made no difference

    Im going to chuck the keyster needles and put in original (least worn) ones with the keyster needle jets

    Do the slide mod

    Sort out the pilot merge chambers

    They were originally done with a lot less knowledge and proper settings and specs available all those years ago so Ill be setting them up (correct jets etc) to the very specific specs for 3LN1 carbs (different than the later models) that are now available

    ... and maybe sorting out the coils, leads and caps + the fuel filter also might make it run 100% instead of 80%

    well maybe :lolsign:
     
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  9. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Giving the old clunker a bit of loving as rego is due for cancellation in about 3 weeks :D ... sadly theres still the carbys to rebuild also

    Looks like the clip had fallen off #3 ... hopefully thats the cause of the lag in the lower rev range ... that Keyster stuff is junk ... low end quality

    Whoever designed the pilot merge chamber bung needs a poke in the eye with a cherry blossom branch

    Battery recharge , new plug caps , new front brake fluid , chain clean , new crankcase breather .... yada yada


    IMG_0810 (Medium).jpeg IMG_0811 (Medium).jpeg IMG_0789 (Medium).jpeg IMG_0808 (Medium).jpeg
     
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  10. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Theres 4 very small holes in the pilot merge chamber thru to the carby throat ... I used a guitar string to make sure they were clear .. the throttle/butterfly needs to be opened as its directly behind

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  11. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Did you check the mixture screw hole's at the bottom of the thread's for any dried up gum /varnish too ?
     
  12. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    An M6 screw or better still an old screwdriver that you can file the flat onto is better for removing those bungs. They are too fragile to grip from the exterior. Poke that into it and you should be able to wiggle it out.
    [​IMG]
     
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  13. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Yea checked that ... Ive been spraying carb cleaner thru the orifices to check they are clean and clear and will blast the air thru just before rebuilding ... carbs are still pretty spotless from the original overhaul ... except the merge chamber area as it was an unknown beast until recently

    special tool #bungremover just manufactured :D ... Ill give it a run on the second 2 carbs

    IMG_0827 (Medium).jpeg
     
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  14. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    A little warm outside today so using the inhouse portable work station ... the bliss of being single :lolsign:

    IMG_0833 (Medium).jpeg IMG_0831 (Medium).jpeg
     
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  15. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Pro tip ... get in close and personal with the merge chamber ... lots of leftover oring and grunge stuck in there

    :cool:

    I see the light !

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  16. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Dont like my chances .... :cool:


    jp parts.png
     
  17. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    $60 at Megazip, but I guess you know that.
     
  18. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    60 US dollars :D

    megazip.png
     
  19. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Well I am too lazy to convert it. :)
     
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  20. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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