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Project Grasshoppers FZR 3LN3

Discussion in 'Your 250cc Projects' started by GreyImport, Feb 16, 2014.

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  1. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    The question is ...why is the shaft longer on the 3LN3? .... did they correct the alignment with the rear sprocket in the later models?
    And it will be interesting to see whats on the 3LN6

    And then the problem is sourcing the correct one ........my initial search reveals mainly '89 onwards' .... including the JT Sprocket website.

    And the parts cat has the same part # for all models :commando:
     
    GreyImport, Dec 13, 2014
    #81
  2. risky

    risky risky

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    could murdo machine up a spacer?
     
    risky, Dec 13, 2014
    #82
  3. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    When faced with these problems! Machine the centre out of both and weld the old one into the new one. Good machine shop can do this easily. Murdo could do it for sure.
    Provided the centre of the old one is in good condition.

    Otherwise there is always the CMSNL option (1YL-17460-00) ???
     
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    Last edited: Dec 13, 2014
    maelstrom, Dec 13, 2014
    #83
  4. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Well yes theres options ..... but they must be available somewhere as one came off it!

    And if the 3LN6 is the same it means dodgy bros x 2

    And what do the rest of the 3LN3 + owners do in this world?? ..... its a consumable .... it has to be available

    Theres plenty of FZR250 front sprockets available but I havnt found any that differentiate with the width factor
     
    GreyImport, Dec 13, 2014
    #84
  5. TechHeadFred

    TechHeadFred Well-Known Member

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    Did I miss something or wouldn't the mounting plate slot into the groove in front of the sprocket and hold it in the right place anyway when it's bolted on?
     
    TechHeadFred, Dec 13, 2014
    #85
  6. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Oh sorry Brian, I missed that about the part numbers. Oh well. Another challenge.
    The output shaft has a different part number. Looks like they just messed up with the parts book, again.
    @Revolver had the same issue with his 3LN3.

    Another option would be if the flat section of the 3LN3 sprocket faces the nut then you could make a spacer from the centre of the old sprocket without the need for any welding. Would be a good idea to measure the thickness of the original sprocket for future reference.
     
    Last edited: Dec 13, 2014
    maelstrom, Dec 13, 2014
    #86
  7. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    theres no plate .... the 'extra' is part of the sprocket
    The fixing nut is limited to how far u can screw it in

    Ahh yea I didn't think to check the shaft numbers
    And yes the sprocket numbers must be wrong

    Interesting that the 520 conversion sprocket is the right width with the lip ....

    http://www.slipstreamperformance.co...250-1986-1993-JT-front-sprocket-steel-52.aspx
     
    GreyImport, Dec 13, 2014
    #87
  8. TechHeadFred

    TechHeadFred Well-Known Member

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    I did miss something then. The front sprockets I've worked with so far all had a mounting plate that locks the sprocket in place on the shaft. Curious to see how the front sprocket on my FZR400 is connected now.
     
    TechHeadFred, Dec 13, 2014
    #88
  9. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    maelstrom, Dec 13, 2014
    #89
  10. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    GreyImport, Dec 13, 2014
    #90
  11. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    They are made in Thailand. Who would have thunk it?
    Is the 9mm shown in the drawing the correct thickness?
     
    maelstrom, Dec 13, 2014
    #91
  12. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Yea the old one is 9mm ,,, flat one is about 7

    Wat actually makes the 520 sprocket different? .... the size , pitch, angle of the teeth?
     
    GreyImport, Dec 13, 2014
    #92
  13. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    [​IMG]
     
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    maelstrom, Dec 13, 2014
    #93
  14. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Thanx Blair

    Well maybe someone with a 3LN3 + that's done their sprockets can shed some light
     
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    GreyImport, Dec 13, 2014
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  15. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Last edited: Dec 13, 2014
    GreyImport, Dec 13, 2014
    #95
  16. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Call them and ask. Zeals are very similar... perhaps we will have better luck with mid 90's model zeal parts?
     
    Linkin, Dec 13, 2014
    #96
  17. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    GreyImport, Dec 13, 2014
    #97
  18. Grasshopper

    Grasshopper Well-Known Member Dirty Wheel Club

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    Let's make/find a suitably accurate washer...
     
    Grasshopper, Dec 13, 2014
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  19. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Well this is just par for the course, isn't it? The washer idea is a fix but you lose the advantage of having more spline. Might be worth trying to get Yamaha to supply the real part number. There are probably five or six hundred genuine sprockets sitting at the spare parts section at the factory and no one ever bought them because they didn't have a part number.
     
    maelstrom, Dec 13, 2014
    #99
  20. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Yea .... 'fixes' in important areas don't do it for me .

    As u say if the part number is incorrect from Yamaha we are off to a bad start ...... the local dealer here uses exactly wat we have.
    If we had the right part number we could at least see what other machinery runs the same setup
     
    GreyImport, Dec 13, 2014
    #100
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