Front knock over bumps, anyone figure out what causes it?? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
DL650 and DL650A - 2004 to 2011 DL650 from 2004-2006 (K4-K6) and DL650 or DL650A from 2007-2011 (K7-L1)

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post #1 of 29 Old 05-24-2008, 12:30 PM Thread Starter
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Front knock over bumps, anyone figure out what causes it??

I know it's been discussed before. I get the knock over railway tracks but it's annoying. When I ride a gravel road and hit washboard it's very annoying. Sounds like it's from the forks. I installed sonic springs and heavier fork oil and it makes no difference. Has anyone ever solved this? By solved I mean "I did this and the knock is gone".
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post #2 of 29 Old 05-24-2008, 02:53 PM
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I have always noticed that the knock gets worse the colder it gets. In the hot summertime I don't hear it hardly at all, but I do in the spring or fall. It's possible that you need a lighter fork fluid? I say that because when it's cold, the oil is thicker and the noise is worse.


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post #3 of 29 Old 05-24-2008, 03:52 PM
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Unfortunatly, all the Wee's do it, and nobody has come up with the reason and/or cure. I just got used to it.

It did disapate considerably with SonicSprings.

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post #4 of 29 Old 05-24-2008, 04:46 PM
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Mine seems to have stayed about the same with the Sonics, it drives me nuts sometimes. It just feels/sounds like something is going to snap in the front end. I have come to live with and accept it but it still bothers me every now and then (especially on a washboard gravel road).

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post #5 of 29 Old 05-24-2008, 05:36 PM
 
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With the stock damining settings, I would heir the forks bottoming occasionally when hitting bumps a little to hard for the suspension. I adjusted the fork dampers to position 1 + one turn, and haven't really herd the forks bottom. The bike seems to handle better as well with these setting. After I get some other farkels, I will go to a stiffer sping to see how that effects things as well. What Sonic springs do you have? I know that they make after market damping valves, that are supposed to improve things in addition to the super brace.
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post #6 of 29 Old 05-24-2008, 05:47 PM
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You are changing the spring preload setting, not the damping which is not adjustable. That can help prevent bottoming as it takes a longer stroke to bottom the forks.

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
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post #7 of 29 Old 05-24-2008, 06:07 PM
 
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Quote:
Originally Posted by greywolf View Post
You are changing the spring preload setting, not the damping which is not adjustable. That can help prevent bottoming as it takes a longer stroke to bottom the forks.
Thanks for the clarification! Originally, I thought the adjustment was for preload, but was reading a thread somewhere and they were stating that the adjustment was for damping and not preload . Of course a quick look at the owners manual would have confirmed that its for preload. Either way, the adjustment did help quite a bit.
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post #8 of 29 Old 05-24-2008, 06:30 PM
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I'm looking at a magazine article on the 650 that says the hammering is caused by the the fork topping out. It says the 650 uses a progressive rate spring while the 1000 has a single rate. Also the 1000 is a cartridge type while the 650 is a damper rod. Additionally, the 650 has 10mm less travel than the 1000. There's a reason the 1000 costs $3000 CDN more than the 650. In other words, the 650 has a budget suspension while the 1000 has some quality components and better engineering. All that being said, I've never noticed a clunk from my 650. Maybe I'm just not trying hard enough.


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post #9 of 29 Old 05-24-2008, 08:02 PM Thread Starter
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I know it's not spring related. With the sonic .95 it's the same. Maybe fork oil weight but I get the best performance from the 15W. The knock was there with the 10W and you wouldn't want to go any lighter. The forks are not bottoming out. I only hear the noise on shape small bump like railway track or washboard on gravel roads. Almost sounds as if someone is taking a 10lb hammer and is beating on the tire. I don't believe that because the bike is cheap that they compromise the design of the front forks so we should accept it. I've had other cheap bikes before and they never made a clunking noise on washboard. Has anyone ever tried a warranty claim for the noise? How does Suzuki deal with customers who complain of this?
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post #10 of 29 Old 05-24-2008, 08:04 PM
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It definitely isn't bottoming. It's the sharpness of the bump, not the size. While the plan for the 1000's forks is better, the result is not so clear. Lighter weight and better specs favor the 650. Both can stand improvement. http://www.citybike.com/index.php?op...d=69&Itemid=27
Suzuki says the noise is normal. For once they are right. No harm is being done so it isn't a warranty issue.

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/informa...-you-have.html
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