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Project My '90 FZR250 3LN3

Discussion in 'Your 250cc Projects' started by my67xr, Jun 19, 2016.

  1. Andych

    Andych Well-Known Member Premium Member

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    Just Cafe it @my67xr and build a battery box under the rear hump.
    You know you have always wanted to do it.... :)
     
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  2. ruckusman

    ruckusman Well-Known Member Premium Member Dirty Wheel Club

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    Just calculating the ratios of 122/130 -> X/140 yields 131.3mm for the shortened dogbones, so your initial guesstimate of 132mm was pretty close
     
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  3. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    I like your way of thinking but i say no to cafe racers atm, especially if it's FZR250 based.
    Battery fits in the glove compartment easy enough now. But i'll just make a new tray to mount it horizontally where it was previously mounted (luckily it's a drycell so cant leak) 20180301_082134.jpg 20180301_082123.jpg
     
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  4. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    These are the 122mm eye to eye dog bone's i made yesterday.

    20180228_163329.jpg




    I've picked up another piece of stainless for the 132mm eye to eye dog bone's this morning, $7 for a piece of 30mm x 6mm, 300mm long
    20180301_091724.jpg
     
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  5. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    So the new 132mm centre to centre dig bones are made and fitted. Ride height is back down to normal again.


    20180301_142413.jpg


    And new v's original (left)

    20180301_142916.jpg 20180301_145229.jpg 20180301_145324.jpg 20180301_145229.jpg 20180301_145243.jpg 20180301_145312.jpg
    1111fzr.jpg
     

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    Last edited: Mar 1, 2018
  6. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    My new battery tray is half done.
    It uses the 2x original mounting points at the top and also bolt's to the frame where the fuel pump bracket mounts.
    There is now 20mm from the bottom of the battery tray to the shock reservoir. And the battery has almost 40mm clearance to the bottom of the seats' front mount.

    20180301_173815.jpg 20180301_173836.jpg
    20180301_174748.jpg
     
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  7. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Battery tray is finished, painted and fitted now, fairing's, seat and tank to go back on.

    I was researching lowering a sportsbike and most page's recommend lowering the front if lowering the rear
    The rear shock is only 10mm lower than the original so i have lifted the fork's 10mm in the tripple's to keep it level.

    20180302_202326.jpg 20180302_224723.jpg 20180302_224942.jpg 20180302_222630.jpg
     
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  8. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    They are supposed to be about that from standard, I think. This pic from the brochure.
    forks.jpg
     
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    Last edited: Mar 3, 2018
  9. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    My FZR250R 3LN3 service manual supplement arrived today

    I can now confirm that the 3LN3 fuel level is 10.5mm above the line, just like i worked out from trial and error
    Float height would have been handy too

    I will try and scan all the page's and upload it into the resource area when i get a chance

    20180323_201458.jpg

    20180323_203811.jpg
     
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  10. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

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  11. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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  12. ruckusman

    ruckusman Well-Known Member Premium Member Dirty Wheel Club

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    My Bike:
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    Just work backwards - for 3LN1 - the float height @16.2mm -> fuel level/height 9.2mm
    So for 3LN3 float height @14.9mm -> fuel level/height 10.5mm

    That should be simple enough to verify by measurement
     
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  13. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Maybe one day i'll remeasure the float height's @ruckusman, but it is running so good atm i don't want to touch it just in case


    About a month ago i had another play with the mixture screw's, bike was at operating temp after a ride so i pulled the tank off and tried the mixture screw's at 1.75 turn's out (from memory), the idle came up a couple of hundred rpm.
    So i dropped it back a bit and then used my Carbtune Pro balancer/sync tool on it.
    It's surprising how much adjusting the mixture's 1/4 of a turn in can throw the carby sync out
    Took about 20min's to get them all even again, and the rev's came up a bit more again, so i dropped it back to normal.
    I still haven't checked the actual idle speed/rpm, to see if it's close to the 1600rpm with my Optical Tachometer, but i think it's pretty close.
     
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  14. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    A few updated pictures 20180408_175222.jpg 20180408_175317.jpg 20180408_190836.jpg
     
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  15. ruckusman

    ruckusman Well-Known Member Premium Member Dirty Wheel Club

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    If it runs anywhere near as well as it looks it's an absolute screamer - that thing is gorgeous
     
  16. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Thank's, it goes better than it look's, I really need to fix a couple of thing's and respray it
     
  17. ruckusman

    ruckusman Well-Known Member Premium Member Dirty Wheel Club

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    HA HA better than mine, it looks awful and doesn't go at all
     
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  18. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Have picked up a used muffler shell, and a hotdog to modify and make up a straight through muffler for the drag's.
    Cut the hotdog open today and found the perf tube had cracked and there was basically no fibreglass packing in it.
    I've rewelded the perf tube and trimmed the pipe, welded the front pipe on and that's about it for today, so no straight through muffler to try out tomorrow.
    I fitted a Diet Coke radiator overflow catch can too.
    FZR is ready to load up on the trailer now and helmet cam is on charge, all ready for the morning, :thumb_ups:

    20180519_155830.jpg

    20180518_165707.jpg

    20180519_162026.jpg

    20180519_182227.jpg
     
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    Last edited: Jul 10, 2018
  19. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Had car issues this morning, the Territory is only running on 5 cyl's :headbang:
    I wont be going far today
     
  20. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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