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Old 12-26-2013, 05:43 AM   #16
AB13
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Try adjusting the steering head brgs. AB
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Old 12-26-2013, 06:03 AM   #17
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Originally Posted by ab13 View Post
try adjusting the steering head brgs. Ab
+1
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Old 12-26-2013, 08:05 AM   #18
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wobble!

OK... there is lots on this in here but let me tell you how it does and doesn't occur in my 990.

It is mostly how I have my 990 loaded that causes any wobble/vibration. It will be fine unloaded but then wobble with boxes and a load in the boxes....and then fine again with the wife on top of it all. there are a few variations to that but for the most part always how I load the bike! SO, For me it only wobbles when my rear suspension is at a certain travel position.
From my knowledge of this issue it comes from the REAR suspension but shows up in the front.

If its doing it with nothing on the bike load it with gear or a passenger and see if it goes away. If it does then you just need to adjust your rear suspension. It might even be as simple as adjusting your preload adjuster.



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Old 01-05-2014, 11:42 PM   #19
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experience

ive also had this issue from multiple sources on my 990adv. the first was from having and excess of weight hanging off the luggage rack, this causes the front to raise up a little bit also giving head shake. and two have improperly balanced tires, i found that improper balanced tires wont really give you bad shake a low speeds but it really affects higher speeds.
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Old 01-06-2014, 01:10 AM   #20
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Quote:
Originally Posted by AB13 View Post
Try adjusting the steering head brgs. AB
+2
I had the shakes and put her in for the large service and she came back peachy (orangey??).
That said I had new rubber and wheel balancing too so perhaps that was a contributing factor.
My gut says head stock bearings.
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Old 01-06-2014, 08:59 AM   #21
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My two cents!

Quote:
Originally Posted by KaytM View Post
+2
I had the shakes and put her in for the large service and she came back peachy (orangey??).
That said I had new rubber and wheel balancing too so perhaps that was a contributing factor.
My gut says head stock bearings.

Wheel balancing is not the issue in most cases because the shake will happen at lower speeds. Many Moto x riders don't balance there wheels and don't have this issue.
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Old 01-06-2014, 09:24 AM   #22
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Originally Posted by superhak31 View Post
First off, don't replace Behr rim with a Behr Rim. Get an Excel or Dirtstar DID.
1.85" way stronger than stock wheel. And costs less. And I put in stiffer front springs to avoid bottoming out while off road. No front shake ever.
I had a similar issue due to a bend rim. Just replaced with a Woody's 1.85" Excel rim. I've yet to ride in the dirt, but the handling on the street is noticeably different. Head shake seems to have gone away. I also replaced front wheel bearings while I was at it.

Quote:
Originally Posted by KaytM View Post
+2
I had the shakes and put her in for the large service and she came back peachy (orangey??).
That said I had new rubber and wheel balancing too so perhaps that was a contributing factor.
My gut says head stock bearings.
I agree with head bearings. Put the bike on the center stand and weight the back to get the front wheel off the ground. Push/pull the front wheel forward/backward. Any slop in the head bearings will be obvious. If there is no slop, rotate the bars carefully to see if the bearings are notched. Notched bearings typically result in a vague wandering feeling when in gradual corners.
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Old 01-07-2014, 12:41 AM   #23
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Bad Scorps

Seems I reply to one of these threads every few months or so.

The front scorpion 21" tires have manufacturing defects for the last 5 years or so. The carcass is straight, but the tread is twisted. It's really bad when you corner on pavement and will cause wobbles at some speeds. If you pump up the pressure it will get better, lower pressure makes it worse.

You can live with it or swap it for something else.
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Old 01-07-2014, 02:42 PM   #24
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Shakes??

Put another pint or two in her!!

On another note I think mine are the Scorps also.
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Old 02-26-2014, 07:42 AM   #25
andresg OP
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Hey Guys!
Do You think installing an steering stabilizer will help stop the head shaking?

Check this please and let me know your thoughts:

http://www.promotobillet.com/i-13486...r-bar-kit.html


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Old 02-27-2014, 03:42 AM   #26
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Quote:
Originally Posted by andresg View Post
Hey Guys!
Do You think installing an steering stabilizer will help stop the head shaking?

Check this please and let me know your thoughts:

http://www.promotobillet.com/i-13486...r-bar-kit.html


Sent from my iPad using Tapatalk
No, it might help mask the shake, but that is a bit of a silly idea
You want to fix the shake, not (dangerously) mask it.

- Tyres: part worn, sometimes brand new with a fault, but most common problem
- Suspension - rear shock too hard/soft, front forks to hard/soft... etc..
- Head bearings
- Wheel bearings
- Screen/handguards...

Try all that :) It's in order of likelihood, and the suspension is sometimes the hardest....
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Old 02-27-2014, 04:54 PM   #27
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Wobbling scorpion

My experience, brand new 2011 990 adventure by the 500 km mark it was shaking / wobbling in the front end @ around 75kmph or 45 ml per hr, so took it back to the dealer who rebalanced the front & rear wheel, checked bearings, suspension action & settings & even removed the mirrors, nothing made any improvement & although the front scorp looked fine it was the problem once it was swapped out for a new replacement of the same type of tyre all was fixed. Now 6000 km later although the tyre is almost due for replacement the shakes haven't returned. Now it's time to instal something more dirt worthy. Ps the shaking tyre appeared to the eye as perfect & even balanced up good also but in use was shit house.
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Old 02-28-2014, 07:51 PM   #28
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Quote:
Originally Posted by andresg View Post
None, just the tire.
I normally use 28 -30 psi front...

Tomorrow I'll change the rim for a new one from Behr, move the hub, discs and spokes, get it all balanced and see what happens...
I'll check suspension bars torque, triple clamps and wall-nut again, so far those where correctly tightened though.

Hi

Im sorry unless Im mistaken, your front tyre does not have enough air in it.
Standard should be 35 psi... correct me if im wrong
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Old 03-02-2014, 01:48 AM   #29
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Try increasing air pressure 3-4 psi at a time, this should eliminate wobble.
Also, you could install a poor mans steering damper, just tighten the headset bearings until front wheel has ~ 2-3 lb pull on bars to move bars( measure with fish scale and string)
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Old 03-02-2014, 05:57 PM   #30
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Quote:
Originally Posted by Wopper View Post
Try increasing air pressure 3-4 psi at a time, this should eliminate wobble.
Also, you could install a poor mans steering damper, just tighten the headset bearings until front wheel has ~ 2-3 lb pull on bars to move bars( measure with fish scale and string)
True, the increased tire pressure will show the front tire as the culprit.

False, over tightening the steering bearings will give you a slow weave or worse. Over tight, they will wear fast too.

Step wise>
1. remove bags, trunk, anything on the luggage rack. The biggest cause. Loose sub-frame bolts?
2. tire pressure, 34 f, 36r or more.
3. head bearings, it should glide to the right under its own weight (heaver on that side). It shouldn't fall, it shouldn't stick, it shouldn't self-center. Tough to get right.
4. Inspect front scorp a/t. About 1 out of 3 are defective these days. The tread will squirm side to side. When you lean it over in a corner, you can feel it a lot. It is still there straight up and down, enough to create head shake. ANYTHING that vibrates slowly (about 2 to 4 times a second) will cause a wobble. Tire not popped out evenly on rim.
5. Inspect rear tire. Odd wear, off center, low pressure, etc. Wide tires need dynamic balancing. Narrow tires, not so much.
6. Ride, Hands off, does it pull? Something's bent. Rear wheel out of alignment.
7. Do the forks move smooth? Loosen the RH axle clamp and push the brake pads back, does the fork slide easy on the axle? Pump the forks to self center it and tighten carefully.
8. Damping adjusters set to reasonable values? Over stiff will make the wheels hop and wobble, overly soft will make it weave and bob in corners.
9. Is it a high speed wobble, like 70 mph plus? Knobbies will just do this. Your tight grip on the bars will do this. High front fenders will do it.
10. Ride a BMW Airhead to desensitize yourself.
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