1. After 20+ years it's time to pass the torch. If you are interested in acquiring this forum please contact support@cv-performance.com for details. Any spam will be reported and blocked.
  2. Welcome to Bike Talk, a forum for all bikers and motorcycle enthusiasts. If you are new to Bike Talk, be sure to register for free and join the conversation.

    There's always someone around willing to help out with questions or give a friendly wave back. All Harley and metric riders are welcome.
Bike Talk Motorcycle Forum is For Sale Welcome to Bike Talk

Rear Primary Bearing and race

Discussion in 'Motorcycle Tech Talk' started by GreyBear, Apr 24, 2007.

  1. GreyBear

    GreyBear New Member

    Joined:
    Jan 20, 2006
    Messages:
    414
    Likes Received:
    0
    Location:
    Nomad, currently the Blue Ridge Mountains
    Howdy,
    Anyone have any experience with the rear bearing and race in the inner primary going south? My SuperGlide is having them replaced now, (under warranty) I suddenly heard a noise that wasn't supposed to be there and pinned it down to the primary and took it to the stealership. They confirmed it and that was the problem so they are fixing it.
    Has anyone else ever had that problem? I have run aluminum primaries since back in the 60's and never had one go bad. Usually IF you replaced it it was just because you had everything else new and figured why not? My 86 Evo had 123K on it when I sold it and still had the same bearing. And the 66 shovel I got a few years ago had the one that came in it in 66. Is this a fluke or something new they "improved"?

    Ride Free......
    GreyBear, Apr 24, 2007
    #1
  3. hotroadking

    hotroadking Super Moderator Staff Member

    Joined:
    Jun 16, 2004
    Messages:
    13,682
    Likes Received:
    584
    Location:
    Mouseville USA
    GB

    It's prone to happen on higher HP bikes more than anything else the race will walk, if it goes in it hits the trans if it goes out it pops the seal on the primary.

    I replaced mine with a one piece bearing support that comes from zippers, it's designed to fit tight to the mainshaft and eliminates the race on the shaft.

    High mileage might do it too, don't know.

    It's worth doing the zippers mainshaft conversion if you have a lot of power.
    hotroadking, Apr 24, 2007
    #2
  4. GreyBear

    GreyBear New Member

    Joined:
    Jan 20, 2006
    Messages:
    414
    Likes Received:
    0
    Location:
    Nomad, currently the Blue Ridge Mountains
    Fixed problem

    Just a heads up. Seems tha they originally suggested changing the bearing every 15K then decided that wasnt neeeded..unfortunatley some of the dynas had a 15k bearing. Now they don't recommend the change...and if needed will warranty it. They did and I have put 1200 miles on it and it seems fine.
    Thanks for the info HRK, I will check into that when I do the big bore kit.

    Ride Free......
    GreyBear, May 8, 2007
    #3
  5. FlynDutchman

    FlynDutchman New Member

    Joined:
    Feb 7, 2007
    Messages:
    445
    Likes Received:
    0
    Location:
    Chicago
    do you know what year Dynas ?? I have a 97 superglide
    FlynDutchman, May 15, 2007
    #4
  6. hotroadking

    hotroadking Super Moderator Staff Member

    Joined:
    Jun 16, 2004
    Messages:
    13,682
    Likes Received:
    584
    Location:
    Mouseville USA
    Here is a link to the Inner Primary Bearing Upgrade

    JMO if you are planning a big bore down the road and you have the inner primary off now, go ahead and do the upgrade now, won't hurt, you have to do a new bearing anyway, and, you won't have to pull the primary apart again when you bor the motor.
    hotroadking, May 16, 2007
    #5

Share This Page

XenPorta © Jason Axelrod from 8WAYRUN.COM