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Pinned FZR R6R rear shock conversion

Discussion in 'Yamaha 250cc In-Line 4's' started by ruckusman, Jul 3, 2016.

  1. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    I wonder what bike these 'R6R' shocks we have are actually from ..... I was looking for the procedure for setup and I found the YZF R6R and R6Z owners manual .... one doesnt have the compression damping 'fast' setting and the other does but its intergrated with the 'slow' adjusting screw .... ours are seperate

    Random photo
    08-r6-shock.jpg

    R6R Rear Shock Absorber Adjustment.png
    R6Z(C) Rear Shock Absorber Adjustment.png
     
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    Last edited: Mar 1, 2018
  2. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    The dominant variable with the spring is the leverage rate, so comparing across models becomes a bit useless. If they have exactly the same shock travel for the same rear wheel travel then the leverage rates are going to be close, notwithstanding rising rate and all that. As I understand most modern sportsbikes have gone back to a more linear rate anyway.
     
  3. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    From what i can work out the shock's you and i have are 06 07 R6R, the later one's (08 onward's) have the integrated hi/low adjuster's
    The earlier shock will fit up to 2017 model's, and the later one's will too but the later one will have more clearance as the reservoir is situated lower.
    And i think the earlier one's have more adjustment setting's ?
    I'm playing around with it now
     
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  4. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    My Bike:
    Yamaha's , 1990 FZR250R 3LN3 , 1986 XT250TS 57R , 1984 IT200L 43G, 1976 IT400C 510
    Checked out all the adjustment's and have found i have-
    Spring Preload- 9 position's, Hi- 16 click's, Low- 32 click's, Rebound- 26 click's
    With it set up full soft i think it's still to hard, it doesn't have as much rear sag as the original shock and the Preload is backed right off.
    Might need to make the dog bone's longer again, maybe 136mm
     
  5. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Need a softer spring
     
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  6. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    Jeez.. if that spring is too hard on the FZR250 how hard is that yellow spring going to be on @Joker 400..... which would be expected to some extent if it was a Race prepared shock.
    I wonder what the FZR standard spring rate is compared to the R6R?
     
  7. Wozza

    Wozza Active Member

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    Is that because its is to hard or that the orig shock was shagged?
    If the new shock is new, it will take about 200 to 300k's to bed in and soften up a little..you can speed this up by going to the highest spring preload when the bike is parked....A quick test of the rear setup is to get up to 20 or 30 kmh and lock up the rear brake, if the back wheel chatters or bounces its to hard if just slides to a stop then your in the ball park...
     
  8. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    You also want it to “squat” a little on hard acceleration, not too much or you will be lifting the front wheel.
    Too hard and it won’t be good in slippery conditions.


    Sent from my iPhone using Tapatalk Pro
     
  9. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    You can calculate a springs rate and there are lots of online versions to do that. Need the free length though.
     
  10. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    I can get the free length of the standard FZR spring. I have mine apart for cleaning and painting
    I will dig it out later and measure it and the number of coils if it is of interest to anyone.


    Sent from my iPhone using Tapatalk Pro
     
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  11. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Sitting on the bike this morning it does feel higher in the rear with the R6 shock and 132mm dog bone's as well as being to firm ( measured it and found it has 8mm sag with my weight on it).

    Out of interest, i just swapped the standard dog bone's back in with the R6 shock just as a comparison.
    Sitting on the bike the rear end feel's like it's standard height or maybe a just touch lower (the R6 shock is 10mm shorter)
    The rear shock feel's about the same as the original FZR shock, the R6 shock is currently on the softest setting's.
    The rear sag with me on it is now 25mm with my riding gear on., the spring preload is set to 1 out of 9

    I reckon i'll finish off the battery tray mount's off and take it out for a ride, i'll have to take a screwdriver so i can adjust the setting's while i'm out
    Will post up the result's once i get back


    When i've fitted shorter dog bone's before to raise a dirt bike and make the rear end a little firmer, i found that with the dog bone's 8mm longer it made the rear end feel 50% stiffer or more due to changing the ratio (the dog bone's weren't as long as these though)
    I worked out that shortening them 3mm was about the limit, and that would make the rear end feel about 20% firmer and also would lift the rear end around 35mm.
     
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  12. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    I may need to start eating pizzas and pies again :cool:
     
  13. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    You will need to get the inside and outside diameter also. https://www.acxesspring.com/compression-spring-calculations.html
     
  14. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Last edited: Mar 2, 2018
  15. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Ok, you might want to delete post #41 above then to avoid any confusion

    I've just finished welding up the battery tray, just need to paint it then i can put the bike back together and try the shock out.
    My shock is set to the softest preload, rebound and slowest hi/low compression damping
     
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  16. Joker

    Joker See "about me" for contact details. Contributing Member

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    Hmm I've never actually played with an adjustable suspension before so interesting to see what I'm getting myself into!
     
  17. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Well i finally got the chance to ride it tonight.
    I set the clickers to the minimum settings above in greys post.

    16 clicks (out of 16) on the fast compression, 24 clicks (out of 32) on the slow compression and 20 clicks (out of 26) on the rebound.

    The bike feels a lot more planted when giving it some, the rear grips really well and makes the front end feel very light, it felt like the front wheel wasnt on the ground a couple of times but i'm pretty sure it would have been.
    The shock soaks up the bumps with ease, and it gave me a bit more confidence accelerating out of some tighter corners, kind of a 'on rails' feel.
    The front end definately steers a lot better, turns in faster than it did before (my fork tops were level with the top tripples though]
    and @maelstrom pointed out that they should have been sitting where it is now (8mm of fork out the tops of the tripples, not including the forks' top cap)
    So they could come out the top a bit more yet to make up for the shorter shock

    I will have a better play next time i go out and see how it feels after a few adjustment's

    I'm pretty pleased with the shock though, it's a great upgrade over the oe shock
     
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    Last edited: Mar 5, 2018
  18. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    That sounds promising :thumb_ups:
    Which dogbones did u have on it? and wat was the preload set on?
    What weight are you?


    Since losing 25kg and riding the other day it felt really uncomfortable .... I felt every bump ... apart from sliding about in the seat ... but I guess it should pull better without the extra load!
    Maybe I should drop my tyre pressures also .... what are yours?

    I think one of my fork seals has a leak so its time for an oil change and weight change ... and I might raise my forks out of the triple tree also .... needs some work on the suspension for sure
     
    Last edited: Mar 5, 2018
  19. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    I have the standard 2KT stamped dog bone's in it now, (140mm centre to centre)
    The spring preload was left on 1, the softest setting
    I'm 5'6" and weigh 65kg

    I have 15w oil in the fork's and also have the preload adjusters (set at 1.5 turn's in)

    Just lowering the front end make's the bike feel a lot more agile.
    I reckon it turn's a bit more now too as i didn't need to do a 3 point turn to get it around the back of our house under the verandah tonight when i got home.
     
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    Last edited: Mar 5, 2018
  20. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Yes I forgot about the front preloaders ... definately have to source those also

    You would just about rate as a "Japanese Jockey" which is what we always say these bikes where built for :lolsign:

    And with all these upgrades as well

    nice work :thumb_ups:
     
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