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Transmission is it possible

Discussion in 'XJ Technical Chat' started by Todd Freddie, Jun 5, 2016.

  1. Todd Freddie

    Todd Freddie New Member

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    I have a vintage 81 yamaha 750
    My Question is what other year make or model will the gears interchange with my bike
    The reason why is my 2nd gear is broken in half I need to replace it and changing fork#3 What other bike has the same transmission parts as the
    1981 yamaha seca 750 Was the transmission used in the 1100 / 550 / 650/ ot the same year or was the Transmission used for multiple years
     
    Todd Freddie, Jun 5, 2016
    #1
  2. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    All XJ650 and XJ750 models 1980-1984 share the same gears.
     
    k-moe, Jun 5, 2016
    #2
    Todd Freddie likes this.
  3. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    Well, there are 2 "different" 2nd gear units, the drive gear (what Yamaha calls the "pinion gear") gear and the driven gear (what Yamaha calls the "wheel gear")------the wheel gear is a single "gear", whereas the pinion gear is a "doubled" or "siamesed" gear(s), i.e. two different gears machined as a single piece:


    HCP7804
    OEM drive GEAR, 2nd wheel
    Yamaha # 99999-02204-00
    s/s from 4H7-17221-01-00
    output shaft, 30 tooth
    comes with the 90209-22252-00 (hcp7322) washer
    item #13 in the diagram
    Applications:
    1980-81 XJ650 M after engine 114697
    1981 XJ650 MM after frame 002134
    1982-84 XJ650 M
    XJ650RJ Seca
    XJ650 Turbo
    XJ750 all


    HCP7775
    OEM drive GEAR, 2nd/3rd pinion
    yamaha # 4BB-17121-00-00
    s/s from 4H7-17121-00-00
    input shaft, 20 tooth + 26 tooth
    item #5 in the diagram
    Applications:
    XJ650 all
    XJ700 all
    XJ750 all
    XJ900RK, RL, N/FN, F


    HCP7322
    OEM shaft WASHER 90209-22191-00
    s/s from 90209-22252-00
    650-900 between 2nd/3rd gear pinion and 4th gear pinion on input/main shaft
    item #3 in the diagram
    650-900 between 2nd gear wheel and 5th gear wheel on output/counter-shaft
    item #14 in the diagram
    Applications:
    XJ650 all
    XJ700 all
    XJ750 all
    XJ900RK, RL, N/FN, F
     
    Last edited: Jun 5, 2016
    chacal, Jun 5, 2016
    #3
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  4. Todd Freddie

    Todd Freddie New Member

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    Sir you have by far answered my question only to raise another if I may
    Question what modification melted , best suits my seca if I wanted to increase the tire sise on the rear tire to a wider tire
    Like the drag style bike
     
    Todd Freddie, Jun 5, 2016
    #4
  5. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    A different motorcycle.

    The widest tire you can fit without modifying the swingarm is a 130.
    A modified swing arm might allow you to fit a 140.
    The shaft drive means that you can't really fit a wider swing arm.
    Keep in mind that wide tires slow-down steering response.
     
    k-moe, Jun 5, 2016
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  6. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    I knew Chacal would add more info as soon as I posted. :)
     
    k-moe, Jun 5, 2016
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  7. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    I lay silently in wait, stalking from afar, hidden by the tall grasses, until the moment is ready and the smell of fear and death are in the air..........
     
    chacal, Jun 5, 2016
    #7
    Lightcs1776, DrewUth, xHondaHack and 1 other person like this.
  8. xHondaHack

    xHondaHack Active Member Premium Member

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    ....and then he swoops in for the kill!
     
    xHondaHack, Jun 5, 2016
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  9. Todd Freddie

    Todd Freddie New Member

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    K-moe your inf
     
    Todd Freddie, Jun 6, 2016
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  10. Todd Freddie

    Todd Freddie New Member

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    I'll try that again sorry . k-moe the information you gave me was spot-on I was able to find the gear and changing fork today . With out having to spend acouple o hundred on a complete transmission or another motorcycle meaning I put it in another part of my build
    Again I thank you sir
     
    Todd Freddie, Jun 6, 2016
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  11. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    I'm just passing on the help that I was given. Please do the same when you have the chance.
     
    k-moe, Jun 6, 2016
    #11
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