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Main jet washer dimensions (5mm vs 6mm ID)

Discussion in 'XJ Technical Chat' started by unplugged1981, Apr 20, 2026 at 5:18 PM.

  1. unplugged1981

    unplugged1981 New Member

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    Hi everyone,


    I’m currently working on my main jet seat of my 1981 Yamaha midnight maxim xj650 and need some advice on a replacement washer.


    The washer measures that is currently on my bike


    • ID: 5 mm


    • OD: 12 mm


    • Thickness: 1 mm


    I’m having a hard time sourcing that exact 5 mm ID locally, but I can easily find one with these specs on a Yamaha dealer not far from my place :


    • ID: 6 mm


    • OD: 12 mm


    • Thickness: 1 mm


    Since the outside diameter and thickness are identical, do you think that extra 1 mm of clearance on the inside diameter will cause issues with the seal or seating of the jet? I want to make sure I won't run into fuel bypass issues or have it off-center enough to cause a problem.


    Has anyone run a 6 mm ID washer in this spot before, or is it better to hold out for the exact 5 mm match?

    Thanks in advance
     
    unplugged1981, Apr 20, 2026 at 5:18 PM
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  2. Secacsm89

    Secacsm89 Member

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    Hit up the pages on the website link XJ forever-at the top right on the website. I'm still working on my extensive rebuil,d with the carburetors myself.
     
    Secacsm89, Apr 20, 2026 at 5:52 PM
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  3. unplugged1981

    unplugged1981 New Member

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    thanks I’ll check that out!
     
    unplugged1981, Apr 20, 2026 at 7:02 PM
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  4. unplugged1981

    unplugged1981 New Member

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    Is there a specific page that deals with the characteristics of the main fuel jet washer?

    Also is it possible to put a brass washer?
     

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    unplugged1981, Apr 20, 2026 at 7:29 PM
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