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Thread: carb help for a 1981 250r

  1. #1
    Join Date
    Oct 2020
    Location
    AZ
    --
    5

    carb help for a 1981 250r

    I tried to rebuild the carb but the round slide rotates in the bore. The locating pin to keep it from twisting is missing .
    It should be an easy fix and a common problem but my search skill suck on the internet.
    Is it worth dicking around with this old carb anyways?
    I see the newer model carbs have a "D" or wedge shaped slide which would eliminate this problem but which one would be best and cheapest?

    Thanks for any advice or tips.

  2. #2
    Join Date
    Apr 2011
    Location
    Connecticut
    --
    1,495
    All slides should have a 'wedge' out of them on one side.

  3. #3
    Join Date
    Oct 2020
    Location
    AZ
    --
    5
    Yes but what's going to stop the round slide from spinning and putting the wedge in the wrong place?

  4. #4
    Join Date
    Oct 2020
    Location
    AZ
    --
    5
    Here is a pic of the problem. I had the slide all the way down oriented in the correct position with the notch for the idle screw aligned, but when I press and release the throttle, it twists and cannot come back down.

  5. #5
    Join Date
    Oct 2020
    Location
    AZ
    --
    5
    Here is a pic showing what I am working with. I do not know what has been changed from stock besides the front wheel.

  6. #6
    Join Date
    Apr 2011
    Location
    Connecticut
    --
    1,495
    You are missing this piece of brass


    Sent from my iPhone using Tapatalk

  7. #7
    Join Date
    Apr 2011
    Location
    Connecticut
    --
    1,495
    You could possibly drill out above the vent pipe and epoxy something to keep the slide from twisting.

  8. #8
    Join Date
    Oct 2020
    Location
    AZ
    --
    5
    Thanks for the pic. I wasn't sure if I lost a part, or it wore out. I saw the dimple where I need to drill and wondered if the original was epoxied in there.
    Time to look around for some brass .

  9. #9
    Join Date
    Apr 2011
    Location
    Connecticut
    --
    1,495

    carb help for a 1981 250r

    If you have a 115 piece drill bit set. Figure out the ID of slot in throttle slide then drill hole in carb a couple thousands under. Cut a section off shank of drill bit and go for a press fit.
    Hope you donít find that missing piece ground up in the bottom end....

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