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Thread: 86 250 big red motor NEED HELP

  1. #1
    Join Date
    Jan 2019
    Location
    Canada
    --
    5

    86 250 big red motor NEED HELP

    I recently pulled crank case motor off the bike to change one way bearing. It's all back together and looks good but when I let go of the throttle there is a grinding/clunking noise coming from crank case any ideas??

  2. #2
    Join Date
    Apr 2012
    Location
    MI, USA
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    3,477
    Can you record a video of it doing it and post it on youtube or something pubic accessible? I'm guessing it's the one way bearing for the primary clutch right (right side of engine)?

  3. #3
    Join Date
    Jan 2019
    Location
    Canada
    --
    5
    Yes right side. Primary clutch. I can get one soon. I only hear the sound when I let off the gas or when coasting down hills and it seems like the bike slips out of gear but when you hit the throttle it catches again.

  4. #4
    Join Date
    Jan 2009
    Location
    ohio
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    1,485
    Sounds like the one way bearing is junk or the collar that the bearing rides on is worn to much for the bearing to catch on it. The bearing you bought was it one of the cheap ebay ones? I bought a eBay one for a bike and a oem one for another one and the eBay one still don’t grab as good as oem ( it might be the collar is worn more one of them I didn’t mic them )
    If its on the internet its got to be true they can't put any lie's on the internet

  5. #5
    Join Date
    Jan 2019
    Location
    Canada
    --
    5
    Quote Originally Posted by big specht View Post
    Sounds like the one way bearing is junk or the collar that the bearing rides on is worn to much for the bearing to catch on it. The bearing you bought was it one of the cheap ebay ones? I bought a eBay one for a bike and a oem one for another one and the eBay one still donít grab as good as oem ( it might be the collar is worn more one of them I didnít mic them )





    I purchased it on amazon. its a AHL bearing.

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