Wobble Fixed for $3 ???
Last summer at around 10K to 12K miles on a 70mph curve I hit one nasty bump hidden in the shadows. The bike went into a wobble, but pulled itself out after a couple of oscillations.
My fix at the time was to sacrifice ride quality and increase the shock air pressure.
At 10K miles, without disconnecting the clutch cable, I had checked the number of front wheel oscillations. It was 3. This was more then I remembered at 0 miles, but still to spec and besides checking the stem bearings was a 20K mile check.
In February I talked to mechanics at both Twin Cities HD and Faribault HD in MN. After explaining my symptoms the conversation went like this:
- How many miles on the bike? 17K
- The swing arm should be OK. Do you have spoke wheels? NO
- Who does your maintenance? ME
- Did you check your steering stem bearings? NO
So this spring I pulled the outer shell of the fairing off and pulled the clutch cable off … still 3 oscillations.
I was committed to tighten the bearing anyway at this point. To adjust them the fog lamps needed to be removed and a decorative chrome shield between the two forks had to be taken off.
This last part was the secret. The wheel oscillations went to 4+. The wiring harness had been touching the chrome shield and dampening the wheel oscillations.
I tighten the bearings to spec. For the last 1K miles I have not felt that flex in bumpy turns even with the shock pressure down. I have not hit one of those “knock the wind out of you bumps” in a curve yet to say if that wobble was cured or not, but I am satisfied with the results.
BTW, both shops were aware of the aftermarket braces and both said that I should not need one.
$3 was the cost of the cheap screw driver that I modified to adjust my stem bearing nut.
***5/13 Edit Follows***
It looks like I touched a sore point with some.
When I wrote this post, I was trying to pass on some knowledge. I was amazed on the positive affect that properly adjusted steering head bearings had on my every day riding.
I rechecked my manual this morning. Steering head bearing adjustment is recommended at 25,000 miles. Mine needed adjustment at 10,000 miles.
The second thing that I wanted to pass on was the influence that the main harness had on “swing momentum” – HD’s terminology. I called it wheel oscillations – hang me. My ’08 manual states: “If the clutch cable or main harness appears to be influencing swing momentum, proceed as follows:” This is a weak statement. I did not think much of it at first. I stand corrected. If you want to properly adjust your steering head bearings, eliminate the drag of the main wiring harness.
On my FLHTC, removing PN 58208-96A (skirt, outer fairing) freed the main harness from influencing swing momentum.
The $3 tool was put in the post to catch your attention. Figure 1-42 in the ’08 touring service manual shows the bearing adjuster tool I made from a long handled screw driver.
I obviously do not know if the one serious wobble that I had would have been eliminated by the bearing adjustment. That wobble took a serious bump (hidden in the shadows and big enough to knock the wind out of me) to set it off. I do my best to avoid these bumps.
And all along I thought that I was going to get crap for praising the mechanics at two local HD dealers.
Last edited by OD_Cleaver; May 13, 2009 at 09:37 AM. Reason: 5/13: To clear up some confusion.
Last edited by GzrGlide; May 12, 2009 at 11:27 AM. Reason: spelling

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