Rubber thing under chain? - Kawasaki KLR 650 Forum
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post #1 of 23 Old 04-06-2015, 07:08 PM Thread Starter
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Question Rubber thing under chain?

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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post #2 of 23 Old 04-06-2015, 09:31 PM
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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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“The kid poured him another straight rye and I think he doctored it with water down behind the bar because when he came up with it he looked as guilty as if he'd kicked his grandmother.” -Philip Marlowe

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post #3 of 23 Old 04-06-2015, 11:04 PM Thread Starter
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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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post #4 of 23 Old 04-06-2015, 11:37 PM
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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.

My Kaw Barn - 2004 KLR, 2006 Concours (sold), 1997 Bayou 400.

"It's a friggen motorcycle, it's not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you shit your pants every now and then. "

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post #5 of 23 Old 04-06-2015, 11:37 PM
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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.

This is my son, with whom I am well pleased." ----God
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post #6 of 23 Old 04-06-2015, 11:46 PM
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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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“The kid poured him another straight rye and I think he doctored it with water down behind the bar because when he came up with it he looked as guilty as if he'd kicked his grandmother.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte

Sting like a butterfly.
Noli Timere Messorem
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post #7 of 23 Old 04-07-2015, 09:43 AM
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Pilot,
As far as the vibration, I think I would check the Doohickey installation before riding again.

Last edited by ThumperBob; 04-07-2015 at 09:46 AM.
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post #8 of 23 Old 04-07-2015, 12:16 PM
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Pictures added.













My Kaw Barn - 2004 KLR, 2006 Concours (sold), 1997 Bayou 400.

"It's a friggen motorcycle, it's not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you shit your pants every now and then. "

<--- Please fill in the 'Location' on your personal profile page. User CP/Edit Your Details

This information makes it much easier for other members to answer/comment on your posts.
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post #9 of 23 Old 04-07-2015, 12:49 PM
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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

Tom [email protected]

“The kid poured him another straight rye and I think he doctored it with water down behind the bar because when he came up with it he looked as guilty as if he'd kicked his grandmother.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte

Sting like a butterfly.
Noli Timere Messorem
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post #10 of 23 Old 04-07-2015, 07:12 PM Thread Starter
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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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