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Discussion Starter #1
I have a 2007 650, with almost 18k miles on it. When I get the bike up to around 6k RPM's, the bike begins to vibrate badly. When I disengage the clutch, the vibration completely disappears. Everything was fine until about 500 miles ago, the vibration started small and has gotten progressively worse. Any ideas?
 

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When you say 6000RPM, do you mean at highways speeds or does it happen at lower speeds as well? If it's speed related it may be a chain or tire issue. If it's only RPM related that may suggest an engine/clutch issue.


If it's a speed issue I wonder if your chain is the culprit? Assuming your clutch is properly adjusted and the wheels are still properly balanced it may be worth checking out. It might be a good idea to check the tires to see if you might have picked up a screw or something. It may still be holding air but any object in the tire may be enough to affect the balance.


SS
 

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It happens with ever gear, no matter the speed. Though it seems to be worse in the lower gears.

I've looked over the tires an I can't find anything wrong with them.

I wouldn't have the slightest clue on what to look for when it comes to the chain.
 

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It happens with ever gear, no matter the speed. Though it seems to be worse in the lower gears.

I've looked over the tires an I can't find anything wrong with them.

I wouldn't have the slightest clue on what to look for when it comes to the chain.
If it happens at low speed as well it might be an engine or clutch issue. It may be something as easy as a loose bolt or perhaps more complicated. I'm sure GW or one of the other knowledgable folks will be able to help you out.

If it's the original chain and it has 18K on it it may be worn out. Also check the adjustment as per the owners manual. There are a few good threads here about chains. Do a search and see what you come up with.

SS
 

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Do you have Givi crash bars by any chance? Mine produce a vibration at about 5500 RPM. I tightened the heck out of them and the vibration diminishes but it is still there. Apparently this is a common issue.
 

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If your Givi crash bars are a problem, try this: The machined plug that fits between the two sides of the crash bars in front of the engine appears to be the culprit because it is a loose fit in order to simplify assembly. You can take the slop out of it and end the vibration by using pieces of plastic shotgun shells as shims on each side. they take up the slopiness perfectly and end the vibration, albeit with slightly more difficult assembly.

George
 
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