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Discussion Starter #1
Background…

I have a 2009 KLR 650 that I bought last summer (first bike). I have been riding around with my wife on the back, and at first, everything was great (got a Sergeant low seat). One day, after it had sat for the winter, I noticed the bike had more than normal vibration. She complained about it too. Each time we rode, she complained about it more and more, while I just got used to the vibration, because it wasn’t that bad. At first, she would only complain if we were at sustained speeds over 60 MPH. She said at 40-45 MPH, the vibration was manageable. I adjusted the doohickey (helped a little). Then, a few days later, she said the vibration was miserable at 40-45 MPH. I didn’t believe her, because from where I sat, the vibration wasn’t that bad. She told me to hop on the back and let her sit in front. She left it in neutral, and ran it to about 4000 RPM. From the passenger part of the seat, the vibration was unbearable to me, while in the driver part of the seat, it wasn’t very noticeable. (I know it’s a thumper and it’s gonna vibrate – but this was so bad my vision was blurry.)

Troubleshooting…

Because I am a cheapskate, I wanted to check engine mount torques before spending money on tools to get into the case to see the condition of the doo and the spring. In order to check the rear mount on the left side of the engine, I had to take the front sprocket cover off. (This is the mount just below the swing arm bolt).That is when I noticed a rubber “U” shaped thing attached to the mount by a metal bracket. It was resting against the bottom of the chain (although it didn’t look right). This is my first post, so can't put pics on here until I have 14 more posts...(I'll get those up as soon as I'm allowed).

My question…

What is this thing? Do you think this is the cause of my vibration problems?

I can’t even get the sprocket cover back on because this thing gets in the way. When I move it out of the way, the chain gets really loose (like this rubber thing was holding tension on the chain.)
 

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pilotd01-

Welcome to the forum:

Do you see the piece you are talking about in this picture?


Tom
 

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Discussion Starter #3
Hey Tom,

Thanks for the picture...It looks like my piece would be located at about J5 (one inch below your pic - lol). My initial thought was the piece was some kind of chain slider to keep the bottom chain from rattling around...but your picture doesn't show anything touching the bottom chain from what I can see. Would I be correct in saying the chain doesn't touch anything between the bottom of the front sprocket to the bottom of the rear sprocket? (Nice front sprocket by the way)
 

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Theoretically the chain shouldn't be touching anything but it could be a lot different when you load up the bike. You really have to have someone look at it when you are both on the bike. Have you checked the chain slack adjustment?? That's your first step.


If you have a picture link from Photobucket or the like PM it to a Moderator and we'll post it for you.
 

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Pilot,
Welcome to the forum, and possibly it slipped down from being wrapped around
the swingarm. It has a track (center guide) that the chain rides in before going
around the front sprocket. In the pic the guide is attached at the far right with a
phillips head screw in black plastic/rubber. The front is visible behind the hex
head swingarm mount. That thing takes a lot of slapping and bouncing from the
chain. It would be the perfect answer if the situation couldn't be recreated in
neutral when the chain isn't in use. This one really is a puzzler. There would
likely be much racket if it were the balancer chain too. I'm out of answers.
 

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pilotd01-

Here's a shot from the sprocket back. Note that I have removed the chainguard stuff back by the rear sprocket, but there should be nothing between the chain and the swing arm up front except for the wrap-around plastic dealio at the front of the swing-arm.


Tom
 

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Pictures added.












 

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That's not supposed to be there. I've never seen one of those, and I wonder who made it and where it came from. An idler wheel like the Top Gun thing would make more sense, but it is wholly unnecessary.

I'd sure as heck take it off and see what it does to the vibration issue.

Tom
 

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Discussion Starter #10
Thanks guys for all the help! I was searching all over to see what that thing did, because it looked like it didn't belong. I'll pull that sucker off, re-adjust my chain, and have a look at the doo. Hopefully I'll have a smooth running machine after.
 

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To me that looks like the rubber bumper that is suppose to fit flat on the lower frame to protect it from the chain. It looks like it some how got rotated up and is pushing the chain up. It also looks mangled be on repair. It should probably be replaced to prtect the chain and frame or you may have more problems down the road if you just remove it. My 2 cents.
 

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grampps -

It could be a misplaced part, but I don't see where it would have come from. I can't see anything in the fiche:


It looks like it is mounted on some sort of bracket. I guess I can understand the intent, but it is too far forward to do any real good, and the KLR doesn't have a real problem with too much chain slack like you might see on an old-fashioned long-travel motocross bike.

I hope pilotd01 will clean it up and take some close-up pictures of it (hint, hint).

Tom
 

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Tom, I don't see it on that fiche picture either but I do see it on my bike. It is a rubber pad on a bracket with one mounting bolt. The bolt is the one circled in red in the second picture. the mount should be facing down not up like in the picture. The pad rests tight on the lower frame just behind the kick stand mount. My chain is only about 1/16" above the pad while resting on the side stand making me think that the chain can hit the frame there. After looking at my bike I am sure that is what it is and it looks like the chain can hit there.
 

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Grampps -

Have you had the bike since new? Got a picture?

I had an '08 from new and don't remember that being there. I have an '09 that I bought used and it's not there.

It seems like a good mystery! (good enough that I'm going to go out and clean gunk off of my bike and see if I've missed something!)

Tom
 

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Here's a picture of mine, Grampps. There might be something there, or there might have been something there once. Not sure, and it's getting dark and raining, so more exploration will have to wait.


Tom
 

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Tom, mine is an 09 I bought used last year but was not even broke in yet. It had about 1200 miles on it and yes I'm bragging. It was a find but a sad story. It looks like a factory part to me but who knows.
 

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Grampps, you sly dog, you!

Thank you, I learned something today.



It's called a 'Chain Guard' and they want $28.66 for it.

Tom
 

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Grampps, you sly dog, you!

Thank you, I learned something today.

It's called a 'Chain Guard' and they want $28.66 for it.

Tom
You learned that you are missing a part on your bike, LOL.
 

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I learned that I've been missing it on two bikes!

Maybe they are selective about who they give it to...

Tom
 
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