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Mikuni Dual Carb Identification problem

Discussion in 'The Garage' started by 1981yamahaxs400caferacer, Nov 3, 2022.

  1. 7A6F9C9B-2FFB-4C4B-A2F2-F4C1546E7315.png Hello…I’ve got a 1981 Xs400 that the previous owner had converted into a cafe racer. They changed out the stock carbs and installed a Mikuni dual carb. I’d like to rebuild the carbs with the appropriate kits but I cannot figure out which type of carb it is. The “Mikuni” and “made in Japan” are in the cast and I know it’s a legit Mikuni I just can’t find the type or model number.
    There are markings on it but they do not match anything I’ve searched for. I will attach the pics of the markings that are on the carbs. Could someone help me figure out what model carbs these are so I can purchase the right rebuild kit? Thank you for reading!! View attachment 37900
  2. tstidham

    tstidham XS400 Addict

  3. CaptChrome

    CaptChrome XS400 Addict

    Welcome. I don't know what carbs they are just from the numbers - can you post a pic of the entire carb?

    If they are not stock, I agree that they are probably Mikuni VM slide valves as retrofit kits are available for the XS400 from a number of sellers. A picture of the carb will tell us the type and a measurement of the bore will tell us the size. From there you should be able to order rebuild parts.

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