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rear sprocket swap question

Discussion in 'The Garage' started by stillwater, Jun 6, 2023.

  1. Jun 6, 2023 #1
    stillwater

    stillwater XS400 Member

    16
    0
    1
    Indiana
    Looking to increase top speeds & drop rpm for interstate travel on my XS400-2.

    I found a Sprocket on eBay, seller says it will fit 1980, 1981 Yamaha XS400
    Would it fit a 1979?
    Or, how could I get it to fit properly?
    :umm:
     
    Last edited: Jun 6, 2023
    stillwater, Jun 6, 2023
    stillwater, Jun 6, 2023
    #1
  2. Jun 6, 2023 #2
    stillwater

    stillwater XS400 Member

    16
    0
    1
    Indiana
    Thought I would add that ones I've found supposedly also fit the earlier XS250 and XS360 models, some of them anyway if that helps.
    Wondering if the '79 had a one-off setup or something.
     
    stillwater, Jun 6, 2023
    stillwater, Jun 6, 2023
    #2
  3. Jun 6, 2023 #3
    CaptChrome

    CaptChrome XS400 Addict Top Contributor

    380
    140
    43
    Southern NJ
    My understanding is that the rear sprockets on the 80-82 bikes had an "offset" to allow the chain to clear the fatter profile tire on the 16" rim. The earlier bikes with 18" rims should have a flat sprocket. I don't know if an offset sprocket will work on the flat sprocket bikes, but I a pretty sure that using a flat sprocket on a 16" rim bike will cause some chain wear on the tire.
     
    CaptChrome, Jun 6, 2023
    CaptChrome, Jun 6, 2023
    #3
    stillwater likes this.

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