Bar Shake

[Travis]

I have noticed that 50 mph and above if I take my hands off the bars the bike will get a very uncomfortable shake. Is this common in the GS or does this mean something is bent or the wheel is out of balance? The only other bike I have rode that does this is my friends 98 ninja 500, but the CBRs and GSXRs I have rode dont do this, what gives?

[Kerry]

The first thing to check is the air pressure in your tire.  It's amazing the difference a few pounds-per-square-inch can make.

If that's not it then we can dig up some checks for unwanted "play" in your steering head, etc.

PS - Check both tires while you're at it.  Then try a Search for "head shake" and similar phrases.

[Blueknyt]

check rear wheel alignment, bad bearings, bad or loose headstock bearings, bent rim/s, Missadjusted fork hieghts in clamps. bent frame, bad swingarm bearings. miss shapen tire.

[Travis]

Ok later today I will check my tires and jack it up and check the bearings, but one of my friends just bought a new GS and I noticed it had bar ends. Mine dosent have these does it make a differance?

[Kerry]

Bar ends may cut down on high-frequency vibration ("buzz") in the bars themselves, but they wouldn't prevent (or cause) head shake.

[slotcar]

I noticed the same shake or shimmy in my '96 GS500E when I bought it a month ago.  I replaced the stock fork springs with a Progressive spring set and it dissapeared, except at 41-43mph. I am hoping when I get new tires it will go away completely.

[sprint_9]

Its the bar ends, I broke one of my screws and had to take mine off and since Ive taken them off I have had a very violent shake when I take my hands off the bars now, first time it did it I thought I was done for.  Id try some bar ends before I tore into the bike.

[Travis]

That sounds like my bike where is a good place to get some bar ends I went to the dealer today and they just had them for gsxrs.

[Kerry]

Its the bar ends, I broke one of my screws and had to take mine off and since Ive taken them off I have had a very violent shake when I take my hands off the bars now, first time it did it I thought I was done for.  Id try some bar ends before I tore into the bike.

Hmmm.  Lots of folks ride without bar ends, even though it's usually not by choice.

The bad shake after removing the bar end(s) could have been just a coincidence rather than a cause-and-effect situation.  I'd keep looking for other possible causes.

I wonder what your tire pressure is like?  :dunno:

[slotcar]

I forgot to mention that when I first got the bike it did not have bar ends. I added them when I put in the new springs. Like I said earlier the improvement was noticed.

[sprint_9]

I still say its bar ends, it doesnt do it everytime you take your hand off the bars but on certain occasions where the load on the front wheel is just right it just goes like hell, needless to say it gets your attention real quick.

For some bar ends maybe check around the for sale page, there have been a couple of bikes being parted out as of late you might be able to find something there.

[Travis]

Ok I just checked my tire pressure and the front was 20 pounds. That seems low to me so I will fill it up to specs and see if it gets any better.

[John Bates]

....... front was 20 pounds. That seems low to me ........

You bet it's low. Should be 33.

My 92E doesn't have bar ends and I don't feel any shake, just a slight buzz.

Then again, I haven't taken my hands off the handlebars either.

[Kerry]

Ok I just checked my tire pressure and the front was 20 pounds.

We have a winnah!

(But be sure to let us know what you think AFTER you get the tires pumped up to 33 psi....)

[jake42]

mine's always had a nasty headshake between 40-50mph.  drives me crazy and is even worse now with the shorter drag bars on it.  I'm pretty sure mine is due to worn headstock bearings because i played with tightening them and now i get this weird pull to one side at really low speeds too like i simply moved the bad bearing around int he race.  The sad part is that I have the new headstock bearings sitting in my basement, just havent' had time to put them in yet.

Jake

[robo]

Ever since i installed my clip ons, i havent gotten my bar ends on and i know they vibrate really hard. Hands start to tingle after half an hour of straight riding. But if i double up my gloves (i wear motox gloves) i can go much longer. I like it though, its nice and massaging  

[Blueknyt]

the bar ends add alittle weight at the end of the bars only to absorbe vibration, they will NOT stop or be the starting Cause of a tankslapper.

it will always boil down to how the tires track, front to back, as well as cintrifical plane (for lack of a better deffinition) worn beraings in wheels, and swingarm will change the way the wheels are oriented on all axis.

head stock (steering neck bearings) may have a flat spot just off center of the Thrust line which may keep the front wheel turned just a touch. giving the effect of the bum front wheel of a shopping cart.

Tire pressure will change the shape of contact patch where the tire meets the pavment.

[scratch]

Remember when I crashed?



Check your suspension. Sag to be specific. You should have no more than 7/8 inch static sag.

[scratch]

Check your suspension, too. Sag to be specific. You should have no more than 7/8 inch static sag. Too much sag causes the steering angle to be steeper, which reduces trail and the castor wheel effect of the wheel tracking in the direction that it's going.

[Travis]

Ok I just aired the front tire up and went for a quick ride. The bike turned in much better but the shaking was still there but only when I let off the throttle. I didnt get to ride long enough to see if it would shake at 55 but while accelerating to 55 and staying there for a few seconds there was no shake but as soon as I let go there it was and the bike was in 5th gear so it slowed down kind of quick.