News:


Main Menu

Cause of low speed wobble?

Started by tomboyjr, June 12, 2018, 04:51:12 AM

Previous topic - Next topic

0 Members and 1 Guest are viewing this topic.

tomboyjr

 Chief, if the feeling is vague, maybe the headset is too tight?

Today I tightened the bearings again. Its actually better, but not fixed. Next time I have a few hours to kill I'll tighten some more-lol.

I recently bought some 'All Balls' bearings for my 650 Husky. Hardly any grease in there at all, so I packed more grease in there before installing. Just a habit I guess.

PoorUB

The easiest way I have found to set the neck bearings is to get the front wheel off the ground, loosen the triple tree clamps, tighten the stem nut until you feel a slight resistance when turning the handle bars back and forth, loosen the nut about 1/3 of a turn and tighten everything up. This way is much easier than doing HD's "fall away" as you don't need to disconnect all the wiring and cable.
I am an adult?? When did that happen, and how do I make it stop?!

jambo

one thing you might try is changing the tire pressure. I run 42 in rear and 40 in front seems to help. I noticed it on my 12 when it was new, increased pressure and rode it. its never been a real issue

Moparnut72

I'll add an experience I had, it might help. I bought a used Sportster off Craig's List from a used bike dealer. It was my first Harley so it might have been one of those they all do it things but it wasn't. The bike has a slow speed weave. It had obviously had a slow speed dump at some point as the tank had a scrape on it, but nothing else. I soon realized one of the steering stops was broken so it was more than a simple tip over. Anyway the weave drove me nuts for awhile. I fabricated a lift and got it off the ground and found that the steering was way tight. I adjusted it to factory specs and then had a high speed wobble. The dealer had tightened the steering to cover the wobble problem. I found that the radial runout on the front wheel was good as was the lateral. I was stumped for awhile then I found that the front wheel had a flat spot, apparently when it hit something to break the steering stop and scrape the tank. I put a new wheel on it, adjusted the steering and the bike was great from then on out. Check everything something is hiding from you.
kk
"The more I learn the more I realize how much I don't know." Albert Einstein

wolf_59

Quote from: rigidthumper on June 12, 2018, 07:44:56 AM
2013 and older touring bikes:
Bike in gear (so it cant roll backwards), spotter making sure the bike doesn't fall over, flat jack on the frame just under the engine, front wheel just off the ground so it clears full swing left/right.
Hold the bars full left, and let go. As it transitions from left to right, count how many movements of direction you get. So, when you let go, the movement to the right is 1. It reverses and goes left, that's two. Back to the right is three, and it stops, without going left again, so that's 3 swings. I find more than three swings makes decel wobble worse.  I find best wobble reduction comes from 1 to 1 1/2 swings on road glides, and 2  to 2 1/2 swings on bat wing bikes.
To adjust, loosen the top nut, loosen the lower pinch bolts, and retest- loosening the top nut will affect the swings.  Decide if you want more or less swings, then rotate the neck bearing star nut underneath the top tree (tighten for fewer swings, loosen for more swings), and retest. Once you think you are close, torque the top nut, and retest. If it's right, continue on. If not, loosen the top nut and keep adjusting the star nut until you're able to get the correct number of swings with top nut torqued.
Once that's good, torque the pinch bolts and test ride.
This should have been done ( along with greasing the neck bearings) at first service, and checked at 10K service intervals.
Thanks for the info RT just got through replacing the extremely stiff monotubes suspension with some progressive springs in my Ultra and thought it would be a good time to adjust the neck bearings I got it set at 2 swings with just a slight kick back to center maybe I'll get a test ride in tomorrow