Truck turbulance induced wobble - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 12 Old 08-01-2007, 12:06 PM Thread Starter
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Truck turbulance induced wobble

Howdy all: Last week I took a trip to Oshkosh WI for the fly-in. While heading up US 41 I got behind a dump truck. My 1000K6 began to wobble slightly until I pulled out and passed the truck. I run with a Cee Bailey screen and Madstad bracket. The windscreen is mounted on the lowest setting and tilted all the way back.

Now wind turbulence behind trucks (or even pickups and minivans) in nothing new, but this wobble was. Anyone else experience such?? Is there a way to "fix" the issue?? or should I just use a bit more throttle??

[U]Chris Mosentine [/U]
2008 HD FLSTF
Previous - 2006 Suzuki DL1000, 1993 Kawasaki VN750, Suzuki DL350, 1976 Yamaha DT400, 1977 Honda XR75.
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post #2 of 12 Old 08-01-2007, 12:12 PM
 
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I am running the standard screen and bracket. However, I am adding the madstad tonight.

I just finished a 1400 mile trip on the DL650. I would get a little wobble behind trucks some times. I was running speeds up to 95MPH.

First, the wobble is slight. All I would do if I felt it would be to get out of the trucks burble. (the area of turbulence behind the truck).

To reduce the wobble, I would also hug the tank with my knees and duck my head a little. Also, a little increase/change in speed and no more wobble.

The main thing is don't just sit there. Change position, speed up or slow down and it will go away.

Last edited by Brasstax; 08-01-2007 at 12:16 PM.
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post #3 of 12 Old 08-01-2007, 12:15 PM
 
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Seems like if I relax on the grips a little it helps.
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post #4 of 12 Old 08-01-2007, 12:48 PM
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Don't run behind trucks! Just tell the cop it's a safety issue.

It's more fun to ride a slow bike fast than to ride a fast bike slow.
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post #5 of 12 Old 08-01-2007, 12:56 PM
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In general, lowering the front of the bike/raising the fork tubes about half an inch or so can help with the way the bike is affected when passing trucks. I don't know if it would solve your particular issue with that combination of windscreen, etc but it does make my bike feel better in this type of situation.

..Tom

My Opinion:
Vee or V= DL1000 before 2014
Vee2 or V2 = DL1000 2015 to 2019
Vee3 or V3 = DL1050 2020 to?

My Stroms:
2006 DL650: 202,000 km 125,500 miles, Sold
2012 DL650 139,500+ km, 86,700+ miles. Sold
2015 DL1000 New July 2015 205,000+ km, 127,000+ miles.

This can help preventing from cars pulling out in front of you (SMIDSY)
SMIDSY detailed report.


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post #6 of 12 Old 08-01-2007, 01:28 PM
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A fork brace helps a lot for this and cross winds. Also lowering the fork tubes helps. I've done both and really like the results. Now I hope to add Sonic springs and see what improvement that makes.

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post #7 of 12 Old 08-01-2007, 01:34 PM
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Quote:
Originally Posted by V-Tom View Post
In general, lowering the front of the bike/raising the fork tubes about half an inch or so can help with the way the bike is affected when passing trucks. I don't know if it would solve your particular issue with that combination of windscreen, etc but it does make my bike feel better in this type of situation.

..Tom

Absolutely Right Tom!! I got my bike about a month ago and I had read on this forum about raising the fork tubes. It seemd that a LOT of the guys do it but I put it off. I finally got around to doing it last Saturday and the difference is unbelievable! My bike used to be a slug in turns and it took a concerted effort to drive with any speed at all going around corners. It's like a different bike now though. I raised mine exactly 3/4" and was very, very careful to be sure that they were both exactly even. It's a lot more stable now and doesn't try to remain tracking straight when I turn it. 3/4" might speed up the steering a little too much for some but given my past roadracing experience, I'm a lot more comfortable with a quicker steering bike then a slower one. I bought it to take on trips and certianly not to race around or I would have bought something else but it sure is a lot more enjoyable for me to ride now. I'm recomend to anyone who has a Vee to raise those tubes and you won't be disappointed.

Jeff

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post #8 of 12 Old 08-01-2007, 02:28 PM
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I tried for exactly half an inch but my forks kept wanting to settle at .54 of an inch. After fighting with it for half and hour I gave in and tightened it at .54".

..Tom

Quote:
Originally Posted by Jeff Kushner View Post
..I raised mine exactly 3/4" and was very, very careful to be sure that they were both exactly even.

Jeff

My Opinion:
Vee or V= DL1000 before 2014
Vee2 or V2 = DL1000 2015 to 2019
Vee3 or V3 = DL1050 2020 to?

My Stroms:
2006 DL650: 202,000 km 125,500 miles, Sold
2012 DL650 139,500+ km, 86,700+ miles. Sold
2015 DL1000 New July 2015 205,000+ km, 127,000+ miles.

This can help preventing from cars pulling out in front of you (SMIDSY)
SMIDSY detailed report.


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post #9 of 12 Old 08-01-2007, 02:31 PM
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Quote:
In general, lowering the front of the bike/raising the fork tubes about half an inch or so can help with the way the bike is affected when passing trucks.
+1 for that. It helps a ton. As also mentioned, a fork brace makes a world of difference.

Scott Craig - Nashville, TN
Red '06 Suzuki DL650 - Red '07 Honda VFR800 - My Bike Page
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post #10 of 12 Old 08-01-2007, 02:31 PM
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Good suggestions all. One of the biggest items I've found to make a difference is... TIRES!! I had some real scares with my K5 650 on the original rubber. I made it better with the forks raised, and I have a Givi and Madstad, which helped, AND I run tank panniers sometimes which seems to help as well. I ran ME880 Metzlers for about 12k miles, (biased ply) and the stability was MUCH improved in dirty or side wind. I've put on Distanzia's recently, and although I like the tires, they are just a bit .... "touchy"?... behind trucks. Not near as stable as the ME880's, that's for sure.

I'm not sure what will be my next tire as these have less than 1000 miles on these. Who knows, it might be time for a different bike before they wear out anyway.

Anyway, the point I'm trying to make is that the tires are probably the biggest factor, but not the ONLY factor.

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