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Old 10-31-2013, 05:33 PM   #1
SnaDank OP
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2012 KTM 690 death wobble

Hello Everyone

I have a new bike & have a Dunlop 606 on front
Mefo (New) in Rear Air pressure 25/25
I have gotten the mad wobble from day 1.

When I put my tools/gas (Mohove bag) or Camping Giant loop Coyote bag
Not as bad.

Just had bike lowered with the link 1 5/8 & raised front back up a scoosh (a tad)
NO CHANGE, mabey a little worse

Please help, I dont want to buy a $400 steering dampner

Dan
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Old 10-31-2013, 05:45 PM   #2
joexr
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If you're saying you lowered the front also , then raise it a little at a time until the wobble gets better. Tilting the bike to the rear increases the steering head angle providing stability. Decreasing rake improves turning at the expense of stability. You may have a taller rear tire and/or a lower profile front tire than before.
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Old 10-31-2013, 06:02 PM   #3
SnaDank OP
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Thanks for the reply,
I had the bike lowered front/back 1 5/8 THEN brought front up
1/2 inch
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Old 10-31-2013, 06:04 PM   #4
CanadianX
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Search an ye shall receive...or something like that. Should be easy to find threads on this issue. Here's a non-tech synopsis of the common thoughts on this issue. 1. Front/rear geometry is off I think the thought is that the backend is too high?? So the fix is to adjust and set your sag then maybe dial it down just a hair. 2. Could be the front and rear suspension settings are not balanced...play with settings?? 3. Could be wheel balance and air pressure.

Most common seems to be 1. My experience is that with a new tire (rear) I get a wobble at about 120km/h once it is half worn, as it is now, I loose the wobble and can rip along at 150+ So I tend to think the back end needs to come down a bit and did take a bit of preload out which helped, so maybe another 1/2 to 3/4 turn will resolve the issue. I've been told that adjusting the rear spring shouldn't be done while it is on the bike as there is a lot of tension on the thread and rings. I make small adjustments and ensure it is clean and then add lube to help the ring turn. I use an drift and tap it around ...very gentle like. Hope that helps some.

Found these links for you to read up on:
http://www.advrider.com/forums/showthread.php?t=811593
http://www.horizonsunlimited.com/hub...r-wobble-52049

CanadianX screwed with this post 02-01-2014 at 04:50 AM
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Old 10-31-2013, 06:24 PM   #5
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OEM MT21s, showroom floor set up, yielded a wobble at 65+mph.
Being a being of limited inseam I lowered the rear by adjusting the rear spring.

Wobble gone... and fewer low speed bike drops.

As they say...lots of threads on this issue.
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Old 10-31-2013, 06:47 PM   #6
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Thanks guys.. Appreciate all ur help.
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Old 11-01-2013, 11:02 AM   #7
Bill the Bong
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Although my suspension was not lowered, I also had the same issue. Realistically, it was best with a Mich T63 front and Desert Race rear. Mine would shake even with a steering damper. Any other tyre combo I tried, resulted in head shake.
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Old 11-01-2013, 01:05 PM   #8
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sag

Try running static sag about 10/20mm to keep rear firmer.
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Old 11-01-2013, 11:18 PM   #9
monkone
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Tried all the fixes, lowered front forks, adjusted sag , balanced front wheel and played with clickers. In the end I put my super enduro front fender on and the poblem was finally resolved.
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Old 11-01-2013, 11:22 PM   #10
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when you say lowered forks you mean raised the front end up right?

i have heard of fenders doing odd things, doesnt surprise me.
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Old 11-02-2013, 03:18 AM   #11
mtntrails
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Aside from "death wobbles" and "tank slappers" which can be extremely dangerous, there are plenty of other benefits to having a steering damper - well worth the $.
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Old 11-02-2013, 07:34 AM   #12
Pantah
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Quote:
Originally Posted by Bill the Bong View Post
Although my suspension was not lowered, I also had the same issue. Realistically, it was best with a Mich T63 front and Desert Race rear. Mine would shake even with a steering damper. Any other tyre combo I tried, resulted in head shake.
Thanks Bill - Just so happens I have a new Desert Race and T63 to mount. I don't have a wobble, though. Mine is lowered on inch with the front fully extended. I have a damper, that helps with the shoulder buffeting above 70 mph. I was hoping the T63 would be quiet like it is on my Yam.

I had a 950 that had a wobble when decelerating loaded. I tightened up the pre-load and damping at both ends and it never wobbled after that.
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Old 11-02-2013, 07:47 AM   #13
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Monkone, do you have a photo of your supermoto fender?

So if i put a 990 type fender on it will get rid of my shake

Dan
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Old 11-02-2013, 09:14 AM   #14
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Other then the cost I really don't understand the aversion to steering dampers people have?

A lot of riders in the Orange Crush Forum call it a bandaid for an otherwise serious problem even when I point out that Superbikes like my Ducati 1198S and Aprilia RSV4 come from the Factory with Ohlins steering dampers on them and they are ridden on pavement only?

Anyway I put a Scotts on both my 690 and 990 when the bikes were first brought home and they have never had a wobble no matter the tire, speed or terrain.
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Old 11-02-2013, 10:22 AM   #15
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i DONT have a damper and have never had wobble no matter the tire, speed or terrain, so now what do we do?

for me its not an aversion to a damper, i havent felt that i NEED one yet, maybe i'm not riding hard enough? or maybe i have adequate upper body strength?
i dunno, but in any event, dampers are a performance riding aid, not a mask for underlying problems.
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