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Project 3LN1 Restoration

Discussion in 'Your 250cc Projects' started by camarda, Mar 22, 2020.

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  1. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    R6 shock is a great upgrade - fork internals or different forks would be a good match

    Curiously I've been doing some thinking, reading, thinking, reading on fuel injection, I'll say it's doable, but there's an upfront cost for the microsquirt to start with

    If I wanted to really do it properly, it would be best with dual injectors, one close to the head for low RPM and a second shower injector which comes in at higher RPM, properly setup for sequential injection and single fire spark

    Doable, but not for the faint of heart as I reckon it would require serious determination to complete
     
    ruckusman, May 7, 2020
    #181
  2. camarda

    camarda Active Member

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    Will need some advice on swapping front fork internals.

    Fuel injection does seem like a complicated project, I like the two injector size idea, would require hours of determination but would be be awesome if achieved.
     
    camarda, May 7, 2020
    #182
  3. camarda

    camarda Active Member

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    camarda, May 7, 2020
    #183
  4. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    My Bike:
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    Better, i.e. stronger springs are required where appropriate and I researched these cartridge emulators

    https://www.mikesxs.net/yamaha-xs650-damper-valve-pr-front-forks-77-84-oem-1t3-23170-00-00.html

    I was going to get some of those and tried to organise a group purchase as their shipping was as much as for one set of the emulators themselves

    What do you tip the scales at?

    Calculate the required spring rate here - https://racetech.com/ProductSearch/12/Yamaha/FZR250/1986-88

    There are other suitable springs available cheaper on ebay and the like, however many don't know what they're selling so it can take some considerable research to determine what the spring rates are for other bikes, doable but sometimes difficult
     
    ruckusman, May 7, 2020
    #184
  5. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    My Bike:
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    Standard tyre sizes are 100/80/17 and 130/70/17.

    The standard sizes are good for the maneuverability and agility of the bike.

    For better tyre choices you could run 110/70/17 and 140/70/17 - Same as the Ninja 250/300, but compared to standard sizes, you compromise on agility and handling to access better tyres.

    I've ridden FZR's and the 100/130 combo was noticeably more agile than the 110/140 combo

    To be honest, access to better quality tyres is what I would be going for in 2020. With the 110 and 140 sizes you can get everything from the old faithful sport demon crossply to the latest and greatest in street legal race tyres, slicks with tread cut in them etc. If you stick with the standard tyres, you're stuck with either old designs or old tyre stock, and limited choice.
     
    • Informative Informative x 1
    Linkin, May 7, 2020
    #185
  6. camarda

    camarda Active Member

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    I weigh 65kg or so. Awesome website, looks very useful if I understood the values it produced, will need to do some research on suspension as I am just as clueless on suspension as I was on fzr’s when I first signed up to this forum.

    Thanks though.
     
    camarda, May 7, 2020
    #186
  7. camarda

    camarda Active Member

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    @Linkin , that’s what I figured, all the new tyres are 110 and 140 minimum. I am a fairly amateur rider and this is my first road bike so I won’t have an agility benchmark to compare to. I was riding around on a ktm 450 supermoto with incorrect geometry(just chucked some 17 inch wheels on it) and it handled like a boat with bad steering.

    I can’t actually decide haha, how bad are the old style tyres if I want to have maximum agility and be true to the original bike. Otherwise, as you said, If tyre technology in 2020 is much better does the additional grip and options outweigh the benefits of the standard agility.
     
    camarda, May 7, 2020
    #187
  8. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    I weigh 85KG so the front springs were way to soft for me, even more evident with the R6 rear shock

    I Guesstimated your weight with the most riding gear you would wear at 78kgs - probably too much, so you could go for .70 - .75kg/mm spring rate springs

    • Modifiers:
      Select the tech: Install it yourself
      Riding Type: Street
      Skill Level: Intermediate/B Class
      Stiffness Preference: Standard Stiffness
      Lowering: Not Lowered
      Rider Weight: 171.96056436

      FRONT FORK SPRINGS
      Recommended Front Spring Rate: 0.74 kg/mm (Use closest available)
      Stock Front Spring Rate: Call kg/mm (stock)



    • Available FRSP 3536 Series Springs are:

    • RT FK SPR 34.8x355 .60kg
      FRSP 353660
      $129.99
    • RT FK SPR 34.8x355 .65kg
      FRSP 353665
      $129.99
    • RT FK SPR 34.8x355 .70kg
      FRSP 353670
      $129.99
    • RT FK SPR 34.8x355 .75kg
      FRSP 353675
      $129.99
    • RT FK SPR 34.8x355 .80kg
      FRSP 353680
      $129.99
     
    ruckusman, May 7, 2020
    #188
  9. camarda

    camarda Active Member

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    Ok cheers for that, is it just as simple as swapping out the springs and the oil. Then reassembling, I’ll guess I’ll read up a bit and watch some vids on front fork spring changes to get an idea.

    Sorry for jumping around on topics but I’m yet to install an air filter in my airbox, can I just use anything that fits into that slot that will filter the air or would I need a specific air filter. I can draw almost anything In cad to 3D print so even if I used the dimensions of the air filter and installed my own foam. (Also if anyone needs anything 3D printed and posted I can help however I’m currently working on getting high quality abs prints as they are much stronger and heat resistant than pla)
     
    camarda, May 7, 2020
    #189
  10. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Do you have an old OEM air filter? I think it was @my67xr that modified his to take a K&N style oil-able element in place of the paper element.
     
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    Linkin, May 7, 2020
    #190
  11. camarda

    camarda Active Member

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    Don’t have one, didn’t even have an airbox, needed to source that myself.


    Sent from my iPhone using Tapatalk
     
    camarda, May 7, 2020
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  12. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    GreyImport, May 7, 2020
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  13. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    my67xr, May 7, 2020
    #193
  14. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Nothing wrong with sport demons at all, other than being a 30 year old design and still cross ply, they are nice and cheap. Pirelli still make them because of their popularity alone. They had a replacement, the sport dragon, I can't say I've seen a set fitted to any bike out on the road, nor fitted any in the workshop.

    I'd go for the Metzelers that @GreyImport had bought, they make a good tyre.

    Otherwise, Dunlop/Bridgestone/Michelin sticky radials in the 110/140 sizes
     
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    Linkin, May 7, 2020
    #194
  15. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    I'm using the standard dogbone's on my FZR250R with the 2007 R6 rear shock, it drop's the rear 10mm so i dropped the front end to suit

    Front end i just changed my fork oil to 15W and added some preload adjuster's, feel pretty good now once i set up the front and rear sag etc
    https://2fiftycc.com/index.php?thre...rk-preload-adjusters-34mm-x-1-5mm-pitch.9852/
     
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    my67xr, May 7, 2020
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  16. Murdo

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

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    I like the Pirelli sport demon as a good all round tyre. Another I like is the Avon roadrider for long life.
     
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    Murdo, May 8, 2020
    #196
  17. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    I'll take a photo and measurements of the air filter sheet and the filter cutout - you could make another out of some plastic - I think it might be ABS, however lexan or another durable plastic would be suitable, then you could cannibalise another suitable air filter for the element

    You could definitely 3d print it, however it would require quite a large print bed compared to the the majority of hobbyist machines that I've encountered - there's a lot of material to lay down
     
    ruckusman, May 8, 2020
    #197
  18. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    Bear in mind there are 2 springs in FZR forks. A small heavy spring and then the progressive wound spring.
    There could well be a set of FZR front forks with brand new tubes, seals and top bushes for sale in the near future ( depends on how the FZR600 items suit my build)


    Sent from my iPhone using Tapatalk Pro
     
    Andych, May 8, 2020
    #198
  19. camarda

    camarda Active Member

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    Those measurements and photos would be helpful cheers, I built my own custom printer, currently 330x330x400 volume. Is it bigger than that.
     
    camarda, May 9, 2020
    #199
  20. camarda

    camarda Active Member

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    Cheers for the info, would the preload adjuster mod be fine for me considering I only weigh in the 65-70kg range.
     
    camarda, May 9, 2020
    #200
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