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Pinned C/Shaft Sprocket for FZR 3LN3-5-6-7 & Zeal

Discussion in 'Yamaha 250cc In-Line 4's' started by maelstrom, Jan 18, 2015.

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  1. HiveFleetAbyss

    HiveFleetAbyss Active Member

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    Won't know until I get it in my little hands apparently still waiting for it to come in, as soon as I get it I'll measure it up.
     
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    HiveFleetAbyss, Jan 22, 2015
    #61
  2. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Linkin, Jan 22, 2015
    #62
  3. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Sorry, don't believe it. Two of the sprockets in the picture are for a completely different shaft.
     
    maelstrom, Jan 22, 2015
    #63
  4. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    I've messaged the seller and asked him to measure the thickness
     
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    Linkin, Jan 22, 2015
    #64
  5. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Yea just a generic pic ....would be good the get the dimensions and even a real pic of the actual one he is selling
    He doesn't state worldwide postage
    Only $AU14
     
    GreyImport, Jan 22, 2015
    #65
  6. Joker

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

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    Here are some measurements I took today of my OEM sprocket.

    20150123_083101 - Copy.jpg 20150123_083126 - Copy.jpg 20150123_083149 - Copy.jpg
     
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    Joker, Jan 23, 2015
    #66
  7. kiffsta

    kiffsta Senior Member

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    that sprocket is rooted mate :cool:
     
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    kiffsta, Jan 23, 2015
    #67
  8. Joker

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

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    It's not entirely rooted as a shuriken lol
     
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    Joker, Jan 23, 2015
    #68
  9. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    3LN3.jpg
    Okay thanks to Stu and HiveFleetAbyss we can add to our list of known facts.
    Well so far we can concur that:
    1/ The later models have a thicker sprocket.
    2/ The spline dimensions of the sprocket in question are known and very common across multiple brands and models.
    3/ A standard 3LN3 sprocket has been measured at 9.56mm thick including the shoulder.
    4/ Fitting a 520 conversion may be a solution - chain will weigh a bit more but greater longevity of sprockets and chain
    5/ A 520 conversion sprocket that was supplied for a Zeal is 9.14mm thick.

    So here is a new pic of what seems to be needed except the sprocket in the pic only has 16 teeth.
     
    Last edited: Jan 23, 2015
    maelstrom, Jan 23, 2015
    #69
  10. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Assuming that the shoulder of the front sprocket is fitted to the inside then an interesting and important issue here is that unless the 520 conversion is designed for this fitment (extremely unlikely) then fitting a 520 conversion might misalign the sprockets. For the simple reason that the inside face of the front sprocket should be 2.55mm from the inside edge. Maybe @HiveFleetAbyss can tell us what the shoulder is on his 520 sprocket :)

    And the parts book shows different part numbers for the rear sprocket (Part 12) even though they have the same number of teeth.
    3LN1_RearSprocket.jpg
     
    Last edited: Jan 23, 2015
    maelstrom, Jan 23, 2015
    #70
  11. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Just to add to the confusion :)
    Here is a pic of the genuine 3LN3 sprocket according to the parts book.

    [​IMG]
    [​IMG]
    Just looks like a normal sprocket except for the recess.
     
    Last edited: Jan 24, 2015
    maelstrom, Jan 23, 2015
    #71
  12. HiveFleetAbyss

    HiveFleetAbyss Active Member

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    Will be getting factory sprocket on Monday hopefully, got sent via post instead of courier to who I'm getting it off.
     
    HiveFleetAbyss, Jan 23, 2015
    #72
  13. HiveFleetAbyss

    HiveFleetAbyss Active Member

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    Hi guys finally got the front sprocket little hard to measure due to the valcun rubber they have on a factory one but hopefully this helps. (Just to clarify that 17.2 is meant to be 7.2)

    20150129_112140.jpg 20150129_111447.jpg 20150129_111502.jpg 20150129_111529.jpg
     
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    HiveFleetAbyss, Jan 29, 2015
    #73
  14. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    @HiveFleetAbyss Can you determine the measurement from the inside metal shoulder that sits against the spacer to the inside face of the sprocket?
     
    maelstrom, Jan 29, 2015
    #74
  15. HiveFleetAbyss

    HiveFleetAbyss Active Member

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    As in far left side of metal part to the far right sticking out piece? If so it's about 12.5mm that 17.2 whic is meant to be 7.2 is just the metal sprocket itself the rubber on the right is 4.5 thick and the raised centre is 0.8 higher than that.

    20150129_111529.jpg
     
    HiveFleetAbyss, Jan 29, 2015
    #75
  16. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Interesting ...thanks for posting it

    Is the rubber easily removable?

    Wat did it cost u?
     
    GreyImport, Jan 29, 2015
    #76
  17. HiveFleetAbyss

    HiveFleetAbyss Active Member

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    Nah being vulcan rubber it's a nightmare to get off, set me back $98
     
    HiveFleetAbyss, Jan 29, 2015
    #77
  18. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Why do you need to remove the rubber?
    Anyway if you look at the dimensions that I put up for the 3LN3 sprocket you can see it has a shoulder of 2.55mm.
    Are you saying that your shoulder is 5.3mm?
     
    maelstrom, Jan 29, 2015
    #78
  19. HiveFleetAbyss

    HiveFleetAbyss Active Member

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    Correct. Are the zeals and fizzers same part number?
    20150129_144841.jpg
     
    HiveFleetAbyss, Jan 29, 2015
    #79
  20. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    There is only one part number shown for the FZR250 and that is the problem. The one shown in the parts book only suits the 3LN1, which has a shorter output shaft.
     
    maelstrom, Jan 29, 2015
    #80
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