Chain slap? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 20 Old 07-03-2019, 11:14 PM Thread Starter
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Chain slap?

Hi Guys,
I recently purchased my first V-strom 650. A well cared for 2005 with no issues. I've put a few hundred miles on her, and there is now a knocking. I am pretty sure it is chain slap. When the bie is not moving, the chain is resting on the chain guard (see pictures). It wasn't happening when I got the bike, and has gotten progressively worse. Any input, things to look for, how i might fix this?
Note: I did take it to a mechanic friend who confirmed that the noise is not engine, etc. I had my son watch as i slowly rode by and he confirmed that the chain was "bouncing".
I appreciate any input and solutions!

Thanks!
JP
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File Type: jpg Chain1.jpg (409.2 KB, 15 views)
File Type: jpg chain2.jpg (390.7 KB, 14 views)
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post #2 of 20 Old 07-04-2019, 12:06 AM
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I would think that the chain either is too loose and needs adjusting or has stretched to the point of needing to be replaced. Also check for links that are stiff. This too will cause the noise, especially under acceleration. Another sign that the chain needs to be replaced. It is usually recommended to change the sprockets at the same time.
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post #3 of 20 Old 07-04-2019, 12:40 AM
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The chain will normally run along the upper chain guide. Though i must admit i haven't looked at it while riding. How much slack is in your chain. 0n a 12 to 16 650 it should be between 20 and 30 mm. Inch to inch quarter. If it wont hold adjustment and stretches in a short time the chain is probably toast. Is rear nut properly torqued and the adjusters set properly?
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post #4 of 20 Old 07-04-2019, 12:47 AM
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I have only ever experienced "chain slap" when the chain has been far too loose. Easy enough to check.
Here is a good video for those not familiar with the procedure. The official stated slack is 20-30mm however a little too loose is far better that a little too tight. 30-40mm for me. Also remember that as a chain wears the slack becomes uneven as some links wear more than others.

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post #5 of 20 Old 07-04-2019, 01:06 AM
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It is normal that the chain slides on the upper plastic guide when not under tension (acceleration).

Chain slack needs to be measured when the bike is on the side stand (not the centerstand). Please report back how much movement you have in the middle of the lower rung.

Another test to see if the chain is worn out is to grab it at the rear sprocket at the 3 o'clock point. If you can lift it off the sprocket and see light coming through, its most likely toast.

The chain is exceptionally clean in your pictures. Did you clean it? If yes, how? There is a big debate about cleaning but those that have long chain life seem to just lube but not much cleaning it.

Do you ride with earplugs? If not use them and ignore most noises unless they are serious ones. These bikes make a bunch of noise that is best ignored.

And if you want to study the subject some more, read here: https://www.stromtrooper.com/general...hain-lube.html
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Last edited by blaustrom; 07-04-2019 at 01:35 AM.
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post #6 of 20 Old 07-04-2019, 11:27 AM
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Put it up on a swingarm stand and rotate the wheel by hand while feeling for tight links. Tight links usually mean the chain needs to be lubed OR that the chain is done and needs to be replaced.

Good Luck
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post #7 of 20 Old 07-04-2019, 12:14 PM Thread Starter
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Thanks guys! The chain has 1 inch of "movement", which is right in the ballpark from what i'm reading. I will put it on the center stand and look for tight links next when it warms up a bit outside. Hoping this is it.
Also, I don't have a motorcycle shop in town here. Can you recommend a chain lube I might pick up at an auto parts store?
Thanks again,
JP
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post #8 of 20 Old 07-04-2019, 12:19 PM
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Another test to see if the chain is worn out is to grab it at the rear sprocket at the 3 o'clock point. If you can lift it off the sprocket and see light coming through, its most likely toast. Can you see light?

Read the link in my post about chain lube. All the answers you need and then some.
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post #9 of 20 Old 07-04-2019, 02:18 PM
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Quote:
Originally Posted by JPTahoe View Post
Thanks guys! The chain has 1 inch of "movement", which is right in the ballpark from what i'm reading. I will put it on the center stand and look for tight links next when it warms up a bit outside. Hoping this is it.
Also, I don't have a motorcycle shop in town here. Can you recommend a chain lube I might pick up at an auto parts store?
Thanks again,
JP
This is what I use from NAPA. Apply it to a cloth and wipe it on the chain. The spray comes out really FAST!!!
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File Type: jpg NAPA Chain and Cable Lube.jpg (31.5 KB, 6 views)
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post #10 of 20 Old 07-04-2019, 02:27 PM Thread Starter
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Ok, I put the bike on the center stand and the chain seams fine. However, When I spin the rear wheel, the rear brake is rubbing. Perhaps the issue is with the rear calipers...Now to figure out how to adjust those. Again, input please?
Sorry for the wild goose chase. Newbie issues, from which I expect to learn. Your experience is appreciated.
JP
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chain fix , chain slap , loose chain , motorcycle chain

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