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Project FZR fix up

Discussion in 'Your 250cc Projects' started by Yetiburger, Oct 7, 2017.

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  1. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    GreyImport, Apr 12, 2018
    #161
  2. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Your 3LN1 carby's have different jetting and float height's than mine

    See number 3 below,
    I reckon the Float Height is causing the bog, so try setting the float height half a mm lower than it currently is set at
    Then try it out, warm the engine up and tune the mixture screw's to suit
    With the float height set too low it'll feel flat when you rev it, with it set too high it'll give you a hesitation/bog


    Here is a CV tuning guide from factoryPro

    Important notes about CV carb tuning

    To properly tune, you MUST:

    1. Have selected the BEST main jet for full throttle power (not just a "good" main jet - we mean "the BEST main jet" for power at high rpm).
    That eliminates the common severe tweaking of the midrange and lower tuning ranges to compensate for a "wrong" main jet.

    2. Then - select the BEST needle height / clip position for power at FULL THROTTLE / MIDRANGE after selecting the BEST main jet -
    That almost eliminates weird problems at cruise caused by tweaked needle heights that were required because the main jet wasn't correct.......

    3. Then, adjust the BEST Float Height for BEST FULL THROTTLE / LOW rpm (many Honda's excluded because floats are not adjustable) -
    You should be able to apply FULL THROTTLE at LOW RPM in TOP gear without ANY misfire of bogging or stumble.......

    If you follow that order, you will have:
    1. Best topend.
    2. Best midrange.
    3. Best low rpm power.

    Then - all you have left is dialing in the pilot circuit - i.e. mixture screw and pilot jet size - That's IT - Don't tweak needle heights and throw away full throttle midrange to try to fix a cruise issue (Unless you want to)
     
    my67xr, Apr 12, 2018
    #162
  3. Yetiburger

    Yetiburger Well-Known Member

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    ok i've redone the float levels and they are all within a mm of 9.2 mm above the line. its taking throttle way better even when cold. should I now wind the mixture screws in to the standard setting?
     
    • Nice Work Nice Work x 1
    Yetiburger, Apr 13, 2018
    #163
  4. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    You need to find the setting that works best for your bike.
     
    maelstrom, Apr 13, 2018
    #164
  5. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    • Thanks! Thanks! x 1
    GreyImport, Apr 13, 2018
    #165
  6. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    I mark the edge of the casing when the screws are turned in full, to help as a guide for 1 complete turn etc ... and also mark the edge of the screwdriver .... but that might just be old age creeping in.

    Set them to the 3LN1 base settings of 2 turns out, then just adjust by small increments as mentioned before .... every bike/carb is different


    pilot screw marked.jpg
     
    GreyImport, Apr 13, 2018
    #166
  7. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    I think the 9.2mm and 10.5mm fuel level's are a good base setting, but every carby can be different still
    Same thing with the mixture screw's base setting of 2 turn's out and 3 turn's out.

    In the end if it's not responsive off idle or has a slight bog/hesitation then i'd check the float's and lower them a touch if needed.
    Then warm up the bike to normal operating temperature and tune the mixture screw's to find the highest idle speed

    As i mentioned before,
    my FZR love's the mixture screw's all set leanish, so at the point the idle speed start's to drop, which on my bike is 1.75 turn's out
     
    my67xr, Apr 13, 2018
    #167
  8. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    • Funny Funny x 1
    maelstrom, Apr 14, 2018
    #168
  9. Yetiburger

    Yetiburger Well-Known Member

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    Also has anybody put LED indicators on their bike? how would I know what resistors i need?
     
    Yetiburger, Apr 15, 2018
    #169
  10. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Mine has cheap China ones on the front and work without them
     
    GreyImport, Apr 15, 2018
    #170
  11. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    Realistically you dont need to run resistors... You will need a LED Flasher can (cheap eBay one is fine) and if you only have 1 light on the dash for the indicators you can do the mod that is shown in this thread
    https://2fiftycc.com/index.php?threads/across-indicator-relay.9233/
    If you have a left and right globe in the dash just use the LED flasher can... much better than running resistors as they do get quite hot plus it saves a bit of power.. not really an issue with the FZR but on old Honda's every watt helps.. :)
     
    • Thanks! Thanks! x 1
    Andych, Apr 15, 2018
    #171
  12. Yetiburger

    Yetiburger Well-Known Member

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    awesome thanks. also how do you replace the bulbs in the dash?
     
    Yetiburger, Apr 15, 2018
    #172
  13. risky

    risky risky

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    underneath the dash.
     
    risky, Apr 15, 2018
    #173
  14. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    • Thanks! Thanks! x 1
    my67xr, Apr 15, 2018
    #174
  15. Yetiburger

    Yetiburger Well-Known Member

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    cool. got them on the way. so cheap. also does anybody know where i can source a second hand r6 rear shock for the conversion?
     
    Yetiburger, Apr 17, 2018
    #175
  16. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    GreyImport, Apr 17, 2018
    #176
  17. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    That flasher can is a ripper. I used it on the Across, so cheap and adjustable as well.
    It is a good buy.
    Good luck with finding an R6 shock, they do turn up every now and then.
    You will probably want the fork adjusters as well to be able to set the bike up properly at both ends.


    Sent from my iPhone using Tapatalk Pro
     
    • Agree Agree x 1
    Andych, Apr 17, 2018
    #177
  18. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    https://tstindustries.com/Ohlins-TTX-GP-Rear-Shock-Absorber-for-Yamaha-YZF-R6-2006-2017.html

    Here are some of the cheaper shock's off ebay
    https://www.ebay.ca/itm/08-TRU-16-Y...ash=item41dde97f85:g:60QAAOSwkvFai11c&vxp=mtr

    Not sure if the silver spring is for a heavier rider ?
    https://www.ebay.ca/itm/08-09-10-11...ash=item441addd2f6:g:yUsAAOSweCNawlfl&vxp=mtr

    Black spring ?
    https://www.ebay.ca/itm/2008-2015-Y...ash=item2aa43838ec:g:BewAAOSwnVZatWjO&vxp=mtr

    https://www.ebay.ca/itm/YAMAHA-YZFR...ash=item33e659ada8:g:dMoAAOSw58Vamrvr&vxp=mtr
     
    my67xr, Apr 17, 2018
    #178
  19. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    my67xr, Apr 17, 2018
    #179
  20. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    It would be interesting to see what differences there are in the rocker arm between the FZR250 and the R6R.
    the one I bought (now on the Hammertone Flyer Project X) was from an R6R..although I think all models 06 and up were R6R's but I could be wrong :)
     
    Andych, Apr 17, 2018
    #180
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