Results 1 to 8 of 8

Thread: Heavy handling issue, stem nut & steering damper adjustment 47 knucklehead

  1. #1

    Heavy handling issue, stem nut & steering damper adjustment 47 knucklehead

    The 47 knucklehead build is having a heavy steering issue I've not encountered before and maybe someone else has had the issue and produced a fix for this. When adjusting the stem nut on the back springer leg it's adjusted to have a slight amount of play up and down play, about .050 to .075".
    1 tooth more in tightening, and it's too tight. 2 teeth less and still heavy handling so where it is set now seems to be the happy medium. Since this is an offset springer I can't turn the locking plate upside down, where the lock pin slides into the nuts fingered top through the handle bars triple tree. When tightening the triple tree handlebar stem top nut the free play is removed. But then the steering is heavy at low speeds. 1 notch more in tightness of the stem nut and the handling is much worse. The damper relieves a very minor amount of the low speed heaviness but it's still there as the damper adjustment seems to not apply enough pressure due to the small amount of space in the dampers spring travel, it just bottoms out and goes from loose to tight in 1/8 of a turn or less. A friend suggested doubling up on the fiber washers (ones being used now are new, top fibre and bottom soft fibre rubberized type) but not certain how that would help. Am running Shenko tires at 26-28 psi as it's set up solo. Anyone might have any idea why this would occur?
    Last edited by ricmoran; 12-12-2018 at 03:44 PM.

  2. #2
    Join Date
    Mar 2008
    Location
    Beautiful Northern NM
    Posts
    12,265

    Re: Heavy handling issue, stem nut & steering damper adjustment 47 knucklehead

    There should not be anything "rubberized" in the damper. OEM friction discs are asbestos based, anything rubbery is going to create extreme drag. The damper spring should not coil bind. You should be able to move the damper lever 180 degrees freely. And .050-'075 is way too much free play, the balls can run at very little clearance, about .005. Also, the crown nut should not be affected by tightening the top nut. If so there is a thread problem.
    Friends help friends move,
    Real friends help friends move bodies!

  3. #3

    Re: Heavy handling issue, stem nut & steering damper adjustment 47 knucklehead

    Thanks Robbie. Seems like when I go 1 notch to tighten, no free play and the steering is worse. For lack of better description of the thinner fibreous washer, yes, it is asbestos material and I used that description or rubberized wrong. Will see what happens with less play again. Hard to tell exactly how much there is as between tight and what is just right the sweet spot sure is hard to find. Will go over it again.

  4. #4

    Re: Heavy handling issue, stem nut & steering damper adjustment 47 knucklehead

    Are the bearings in good shape?
    64 Duo-Glide

  5. #5

    Re: Heavy handling issue, stem nut & steering damper adjustment 47 knucklehead

    There are different length damper rods.

  6. #6
    Join Date
    Nov 2008
    Location
    new britain pa
    Posts
    3,223

    Re: Heavy handling issue, stem nut & steering damper adjustment 47 knucklehead

    Back a few years ago a guy named stillman talk d about this. If I remember right . The problem comes from not using a centering cone on your bearing race. Not sure what bikes the applies to. I’m sure someone will chime in and say “yes or no”

  7. #7

    Re: Heavy handling issue, stem nut & steering damper adjustment 47 knucklehead

    Panacea, yes. Len, understood. It's the correct length. Rob, the centering cone goes on the steering stem 1st and its there at the bottom of the steering stem and top of the lower triple tree.

    After getting the front wheel up in the air, I discovered the stem nut was loose, really loose and not certain why. There had to be 1/4" movement from the assembly front to back. A readjustment was done but the bike not ridden yet as I am suffering from torn back ligaments and am in the midst of prp treatment for rejuvination of those damaged ligaments. Lumbar pain has been through the roof.

    Anyway, am going to get it back on the road hopefully today as weather here is pretty darn nice. Low to mid 80's, sunny and dry. Will advise how it goes.

  8. #8
    Join Date
    Mar 2008
    Location
    Beautiful Northern NM
    Posts
    12,265

    Re: Heavy handling issue, stem nut & steering damper adjustment 47 knucklehead

    It should all look like this!

    Friends help friends move,
    Real friends help friends move bodies!

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Steering Damper
    By Streetgang in forum Police & Military Motorcycles
    Replies: 1
    Last Post: 10-16-2014, 01:44 PM
  2. Steering Damper
    By plstkr in forum Test Posting Here
    Replies: 11
    Last Post: 01-07-2014, 02:37 PM
  3. 70 flh steering damper
    By Custom81sg in forum Harley 1965 & Later
    Replies: 1
    Last Post: 05-29-2013, 07:39 AM
  4. 1936 Harley EL Knucklehead Steering Damper
    By Buzz_Kanter in forum 1936 Harley EL Knucklehead
    Replies: 6
    Last Post: 07-21-2011, 10:53 PM
  5. Steering Damper
    By Bigincher in forum Harley 1936-1964
    Replies: 22
    Last Post: 06-10-2009, 08:05 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •