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I know these things vibrate but....

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Old Dec 14, 2015 | 09:22 PM
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Default I know these things vibrate but....

I was on a 100 mile trip today and noticed an unusual vibration in my bike above 60mph. It has always has some vibration at highway speed but never to the point that I could barely keep my feet on the floorboards. This felt more like a strong buzz throughout the frame, Maybe I was hyper-sensitive to it today but I don't think so. I've checked the tires and for any loose bolts. Engine is running great so I don't think it is s miss. What else should I check?
 
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Old Dec 14, 2015 | 09:32 PM
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I would note at what rpm above 60 you have that vibration and then try to replicate it in all the other gears at that rpm. If you can not then I would think that it would eliminate the engine. From that point I would check trans fluid or possible your 5th gear output shaft bearing, rear belt tension or wheel bearings.
 
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Old Dec 14, 2015 | 09:34 PM
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Buzzing through the frame I'd check motor mounts first.
 
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Old Dec 14, 2015 | 10:05 PM
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Didn't THC post some time back about this same thing tracking back to perished rubber isolators in the floorboards themselves?
 
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Old Dec 14, 2015 | 10:13 PM
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What I feel is kind of all over. Floorboards and seat mainly . So, there is the front engine mount that is rubber. I guess the other mount to check is the top engine mount? It's a rigid mount to the frame right? I guess just check for tightness? I guess the tank has to come off for that .
 
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Old Dec 14, 2015 | 11:25 PM
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Originally Posted by 89FLHTC
What I feel is kind of all over. Floorboards and seat mainly . So, there is the front engine mount that is rubber. I guess the other mount to check is the top engine mount? It's a rigid mount to the frame right? I guess just check for tightness? I guess the tank has to come off for that .
Did you try pulling the clutch in and coasting to see if it goes away?
 
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Old Dec 14, 2015 | 11:33 PM
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Originally Posted by byronk
Did you try pulling the clutch in and coasting to see if it goes away?
No, but thats a great idea. I'll try it tomorrow . Thanks
 
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Old Dec 15, 2015 | 05:01 AM
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Originally Posted by 89FLHTC
What I feel is kind of all over. Floorboards and seat mainly . So, there is the front engine mount that is rubber. I guess the other mount to check is the top engine mount? It's a rigid mount to the frame right? I guess just check for tightness? I guess the tank has to come off for that .
The front engine mount would be favourite for causing vibration. When they pack up the bonding between rubber and steel sleeve fails. The upper mount is not rigid, but is mechanical with a swivel at each end. It would be very unusual if it causes any problems.

I explain what that does in my bagger wobble thread.
 
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Old Dec 15, 2015 | 05:50 AM
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Originally Posted by 89FLHTC
What I feel is kind of all over. Floorboards and seat mainly . So, there is the front engine mount that is rubber. I guess the other mount to check is the top engine mount? It's a rigid mount to the frame right? I guess just check for tightness? I guess the tank has to come off for that .
If either of the stabilizing links have become frozen, the motor will vibrate
 
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Old Dec 15, 2015 | 06:39 AM
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Originally Posted by 0maha
Didn't THC post some time back about this same thing tracking back to perished rubber isolators in the floorboards themselves?
It did on my bike at least.
 
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