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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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  2. Murdo

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

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    Grinding that bit out to fit it wont be a problem, most of the load is verticle taken by the sides.
     
  3. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    The FZR 3LN1 shock is 40mm width and is a nice slide fit into the SRX frame (same width as the SRX top mount).
    The R6 shock is 30mm width... so a 5mm spacer each side will do the trick.. it looks to be quite a bit more than that in the pics though...

    The SRX mount doesnt have the thick mounts like the FZR... thought they are steel... and looking at it I am going to have to cut out quite a bit to clear it... but thats OK... If I have to add some gussets on the outside of the mounts it isnt too big a deal.

    UNADJUSTEDNONRAW_thumb_f55.jpg UNADJUSTEDNONRAW_thumb_f56.jpg
     
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  4. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    Hmm perhaps I had to stack two washers each side - the 5mm difference does look like much more than that in the pics.

    Now it's got me pondering why I didn't investigate replacing the sleeve with a wider one
     
  5. Andych

    Andych Moderator Staff Member Premium Member Contributing Member Dirty Wheel Club

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    Haha... these things make the brain hurt...
    I will either get spacers done in Alloy or HDPE... HDPE is top of the list right now... I can probably buy small nolathane bushes and machine them down at home using a Cap screw to hold onto my drill... As long as they are the same width it will all be OK.
     
  6. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    How did you come up with 122mm ?
    My 3LN3 dog bone's are 140mm long
    3LN1 dog bone's are a different part number to 3LN3, 5, 6, 7
     
    Last edited: Feb 28, 2018
  7. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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    OK that's interesting - I got the 122mm (hole centre to hole centre length) number elsewhere from someone that had successfully completed the operation

    The original post which yielded the 122mm measurement was here
    http://www.fzr250.com/viewtopic.php?f=22&t=3554&p=27985#p28046

    You could determine the number experimentally - prop the back where it should be, remove old shock, and replace with new then see where the dog bones should be shortened to, that was the basic process I read about
     
  8. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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  9. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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  10. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    I went through about 600 thread's back to 2005 and couldn't see it, ill just try a few different length dogbones
     
  11. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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  12. ruckusman

    ruckusman White Mans Magic Master Premium Member Dirty Wheel Club

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  13. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    I'll go buy some more stainless tomorrow so i can make a set of 132mm dog bone's :thumb_ups:
    My neighbour is going to love me cutting and grinding 2 day's in a row :)
     
  14. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    I'm interested to know if the 3LN1 dog bone's are a different length to the 3LN3 onward's, seeing as they have different part numbers
    Mine are 140mm centre to centre
     
  15. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Ill measure mine t/m
     
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  16. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    These came off the 3LN1 spares bike that came with mine

    IMGP0639 (Medium).JPG
     
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  17. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Yeah they are the same as what was on my 3LN3, same number stamped onto it as well
    I wonder why 3LN1 have a different part number ?
     
  18. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Maybe you could make some temporary adjustable items to get your length right before making the stainless versions. Threaded rod with some large washers welded onto nuts type of thing. Or measure on the bike with the wheel held in the right place.
     
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  19. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    That be the right way to do it,
    and i do have a pair of home made adjustable dog bone's that i welded together year's ago for that purpose, made them out of a couple of Ford deep 1/2 wheel nut's, a disc brake stud and a couple of thick washer's but i'ts buried at the back of my shed and too hard to get out atm

    This morning i couldn't find my 12mm reduced shank drill bit, so i had to modify one to use in my cordless drill
    (my drill press is also buried at the back of my shed atm)
    Just need to round off the end's and tidy the new dog bone's up now.

    20180301_095522.jpg

    20180301_120526.jpg

    20180301_120907.jpg
     
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  20. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    New 132mm eye to eye dog bone's (left) v's original 140mm eye to eye dog bone's (on right)

    20180301_142916.jpg
     
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