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Old 05-12-2013, 09:41 AM   #31
jon6.0 OP
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Ideally you want to fix the shake and then install a steering damper. Installing a damper on a bike that is doing the death wobble will only mask the problem and wear out your damper faster. It seems the 990's don't like going over 60-65mph with soft knobbies like the 908RR front tire. I might try a MT21 on the front after the T63 depending on how much I like the T63. The T63 tread pattern looks like it will be a better choice for something that sees highway speeds though.
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Old 05-12-2013, 09:55 AM   #32
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Quote:
Originally Posted by jon6.0 View Post
Ideally you want to fix the shake and then install a steering damper. Installing a damper on a bike that is doing the death wobble will only mask the problem and wear out your damper faster. It seems the 990's don't like going over 60-65mph with soft knobbies like the 908RR front tire. I might try a MT21 on the front after the T63 depending on how much I like the T63. The T63 tread pattern looks like it will be a better choice for something that sees highway speeds though.
^--- What he said, except they do like 65+ on knobbies, just not on pavement, lol! It's a tire designed solely with dirt in mind. Why the Baja has those tires stock and not an R or S suspension will forever elude me.
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Old 05-12-2013, 10:06 AM   #33
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Originally Posted by fridgyis View Post
A steering damper is going to be my fix I think.
Pick the right tyres - this will go away, as the others have said a steering damper is not the right to correct this.

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Originally Posted by jon6.0 View Post
It seems the 990's don't like going over 60-65mph with soft knobbies like the 908RR front tire.
I don't that I would say the 908 a soft knobby - I think they are too hard, tyres like Scorp Rally, Karoo 2, TKC 80, Michelin Starcross are all softer the 908 and work much better.
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Old 05-12-2013, 11:00 AM   #34
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I don't that I would say the 908 a soft knobby - I think they are too hard, tyres like Scorp Rally, Karoo 2, TKC 80, Michelin Starcross are all softer the 908 and work much better.
The 908 knobs are fairly tall. Which I think is making the knobs squirm around leading to the death wobble. This would account for reports of people saying it got better with some miles on a 908. They are wearing the knobs down, thus less squirm and less wobble. The T63 has a much shorter knob right off the bat and a bit harder compound. How long does a Scorp Rally last?
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Old 05-12-2013, 01:52 PM   #35
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The Front are about the same as a Karoo the rears not about 2/3 of say a 908. But awesome grip.
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Old 05-14-2013, 07:48 PM   #36
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Laugh Phew, not just me then

So I got my Baja on Friday eve and dropped her off Monday morning for her 600 mile service. Head wobble was really disconcerting. I joined Adv to see if anyone else was having the issue.
It's controllable as but I would not want to be fully loaded and experience this. I will keep watching to see what the fix suggestions are and report back on anything I may learn.
Hurrah for forums!
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Old 05-14-2013, 09:57 PM   #37
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Originally Posted by Porkchops View Post
So I got my Baja on Friday eve and dropped her off Monday morning for her 600 mile service. Head wobble was really disconcerting. I joined Adv to see if anyone else was having the issue.
It's controllable as but I would not want to be fully loaded and experience this. I will keep watching to see what the fix suggestions are and report back on anything I may learn.
Hurrah for forums!
The front is very under-sprung. It makes the front sit nose down. This makes the front less stable at speed. The real fix is stiffer springs and proper front sag. I just ordered some .62's from Slaven's today. Stock is .48 if I remember right. Proper suspension geometry will make the bike less picky for tire selection.
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Old 05-14-2013, 10:02 PM   #38
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Question if I may be so bold.....how much do you weigh?

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Originally Posted by jon6.0 View Post
The front is very under-sprung. It makes the front sit nose down. This makes the front less stable at speed. The real fix is stiffer springs and proper front sag. I just ordered some .62's from Slaven's today. Stock is .48 if I remember right. Proper suspension geometry will make the bike less picky for tire selection.
Ok. Cool. Im 240llbs dry. Just put new springs on my Ktm 450 xcw so I will be interested to hear how yours work. How much do you weigh?
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Old 05-15-2013, 04:48 AM   #39
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275lbs. The stock rear spring should work fine for you. I'm a actually running my rear with the preload turned full soft right now. Once I put the fork springs in, I will probably be around 3-4 turns in from full soft on the rear.
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Old 05-15-2013, 05:18 PM   #40
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My thinking must be backwards! I always thought to stop the tank slappers you weight down the front end. A light front end will feel loose?
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Old 05-17-2013, 10:38 PM   #41
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Laugh headshake

I talked to the mechanic who also owns a 990 and he put .70 springs in the front to combat the issue.
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Old 05-18-2013, 01:05 AM   #42
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Jeff Slaven told me to run .62's in mine. I don't think the stock valving will be able to control .70's. That seems too much unless you weigh 350+ lbs. I'm 275 and will be having the .62's installed next week during the first service.

www.slavensracing.com
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Old 05-18-2013, 03:42 AM   #43
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I have a Scorpion rally on the front (with HD tube) no head shake at all. Just did a 3000km + trip mostly dirt however some 100kmh plus tar, good grip in all conditions and no issues. Also have a ralle moto damper and while this is one of the best things that I have ever put on a bike it will not fix a tyre issue including alignment or balance.

Ps When the Scorpion rally is done I will go the same again, used to have 606's on my 640.

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Old 05-18-2013, 04:54 AM   #44
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Head shake

I have the same bike as well. It shakes its head severely at highway speed. I have a 19-17 combo set up for street and it is fine with that set up. The stock tires are brutal! However they are a must off road.I have ordered a steering damper from pro Moto billet and will report on that when it is installed. I have also installed stiffer springs because the stock ones suck.
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Old 05-18-2013, 09:24 AM   #45
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Hey Jon, just an update for my head shake. Gone with a bit of adjusting to the forks. I'm still gonna go heavier for springs and stretch them a bit, but it's all better now! Today = some new tires and doodads too, :)
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