woble at high speeds - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 33 Old 07-26-2006, 07:36 PM Thread Starter
 
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woble at high speeds

I just bought a 2005 Black Vstrom 1000 with about 2,000 miles on it. I am 5'7" and decided to lower it with the kaba links that lower it 1" and 1/8. "reading all the links on this forum I never read anything about making the bike unstable at high speeds" I went on a trip from Albuquerque NM to Laguna Seca to see the moto GP races. I did not ride the bike on the highway before lowering it So I dont know if lowering caused the problem. I have followed the posts about raising the front forks the same as the back. I did raise the front but I could not raise it as much because it hits the handle bars. I raised it as high as I could I would say close to 1 inch. While riding I got behind a semi and the woble from the front scared the crap out of me :shock: . It was so bad I thought I was going to lose control of the bike. I was traveling about 80 mph. It does not matter the speed I am traveling while behind a semi I get terrible woble. I have to hold on for dear life. While riding on open road the wobble starts to come on at about 90 mph.
When I got to laguna seca, I camp with a sport bike racer and mechanic who said you should never raise the front forks. He gave me this long explanaiton why so I put the front back to the origanal hight and I did notice improvement, but still woble at around 100mph. Is it normal to have woble on the 1000 vstrom. If it is this is the most unstable bike I have ever ridden and I will sell it as fast as I can. If not could you please give me some advice on what I need to do. I do have new springs to put on but I dont think this will fix the problem.
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post #2 of 33 Old 07-26-2006, 08:44 PM
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What other changes did you make? Windshield, luggage, anything out in the airstream other than stock? Top boxes are notorious for causing high speed instability for example.

Pat- 2007 DL650A was ridden to all 48 contiguous states. I didn't quite make it to 17,000 miles on the 2012 DL650A.
Nicknames I use to lessen typing, Vee = 2002-2012 DL1000s. Vee2=2014-2016 DL1000s. Wee = 2004-2011 DL650s. Glee = 2012-2016 DL650s
See https://www.stromtrooper.com/general-...nicknames.html

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post #3 of 33 Old 07-26-2006, 09:03 PM
 
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Quote:
Originally Posted by greywolf
Top boxes are notorious for causing high speed instability for example.
Pat,

Question from a relatively new V-Strom owner...

I have a Givi E52 topbox on my 650. Need it for groceries, laptop and all the other mundane realities of getting here and there intown.

Should I take it off for long trips where I'll be on the interstate? On the one hand, the brakelight on the topbox is a major plus to safety. On the other hand, I'm a little worried about the topbox causing some instability.

Also, is the topbox instability an air foil thing or a weight thing? (ie. will an empty topbox still cause instability?)

Any opinions?

(Two weeks ago, did an overnight ride to West Virginia and left the top box at home.)

- Tom
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post #4 of 33 Old 07-26-2006, 09:10 PM Thread Starter
 
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I have jessy side bags, i put a madstad bracket with stock windshield adjusted low position and tilted back about 1/2 way. No top case.
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post #5 of 33 Old 07-26-2006, 10:18 PM
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Sidecases used to come with warnings not to exceed 80mph. Topcases are worse with the weight higher and farther back from the center of mass. The Strom is a tall lightweight compared to the big touring bikes and luggage can be a significant part of the total weight and aerodynamic profile. All I can say is what I plan to do after a high speed wobble turned into a tank slapper and threw me off.

1. I'm going to keep my speed under an actual 80mph especially with luggage and a tall windshield.
2. I'll keep any heavy stuff I consider a must to carry in a tank bag or forward under the seat which is close to the center of mass. The lower front of the sidecases can be used in a pinch.
3. I'll only take the topcase and tall shield on really long trips where I really need the room and keep only very light items there. The topcase is also useful for short, low speed trips in town.
4. I will install a Scotts steering dampener.

Pat- 2007 DL650A was ridden to all 48 contiguous states. I didn't quite make it to 17,000 miles on the 2012 DL650A.
Nicknames I use to lessen typing, Vee = 2002-2012 DL1000s. Vee2=2014-2016 DL1000s. Wee = 2004-2011 DL650s. Glee = 2012-2016 DL650s
See https://www.stromtrooper.com/general-...nicknames.html

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post #6 of 33 Old 07-27-2006, 01:21 AM
 
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Ive had my 06DL1K up to 120mph, and held that speed for a couple miles with no issues. Solid as a rock. The bike is bone stock right now.
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post #7 of 33 Old 07-27-2006, 07:20 AM
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My DR650 started wobbling badly above 70 mph. I rebalanced the front tire and never had the problem again. Its worth a try. Your bike should be very stable.

02 DL1000
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post #8 of 33 Old 07-27-2006, 10:55 AM
 
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Sounds to me like your bike isn't the problem, the semi is. My bike gets a scary wobble behind semis as well, but it is just due to the turbulence. You might also notice your jacket blowing around, your head getting knocked about, etc. The reason the fork lowering probably made it worse is because the steering became more responsive. As the wind blew you around, you were probably moving the handlebars some and causing the bike to wobble. My recommendation would be to not ride behind the big rigs. All these aother things (luggage, windshields, etc. ) just amplify the turbulence issue.
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post #9 of 33 Old 07-27-2006, 11:48 AM
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My Wee-Strom with a 45-liter topbox has no stability issues, it's rock solid. I have noticed that some riders tend to ride tense, ie they keep a death grip on the bars constantly, which is a big no-no.

If you get into a wobble on any bike, the worst thing you can do is try to grip the bars tighter. Instead, grip the bike with your knees and heels, and relax your arms somewhat. The bike will sort itself out quickly.

A couple years ago I built a 1987 GSXR750 racebike to use in a race class setup for old bikes. That old Frankengixxer flexi-flyer would wag its head at most any opportunity, I got used to it and went quite fast on that bike just by being a good passenger and not making white-knuckle steering inputs.

Give it a try and see if the relaxed-arm method works better. If you've ever watched a motorcycle race and saw a near-crash which resulted in the rider being ejected but the bike is still barrelling alone down the tarmac on two wheels, notice the motorcycle tracks straight and true without steering inputs from the missing passenger. :lol:
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post #10 of 33 Old 07-27-2006, 01:12 PM
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Be careful with absolutes. My bike spit me off with my hands off the bars hoping for the amplitude to decrease as I watched it increase. Aerodynamic and weight distribution changes from stock can make an inherently stable bike very unstable at speed.

Pat- 2007 DL650A was ridden to all 48 contiguous states. I didn't quite make it to 17,000 miles on the 2012 DL650A.
Nicknames I use to lessen typing, Vee = 2002-2012 DL1000s. Vee2=2014-2016 DL1000s. Wee = 2004-2011 DL650s. Glee = 2012-2016 DL650s
See https://www.stromtrooper.com/general-...nicknames.html

Please vote in the poll on what Strom(s) you have at https://www.stromtrooper.com/informat...-you-have.html
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