Replacing my engine dampener mounts for vibration issues - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 7 (permalink) Old 01-13-2010, 10:25 AM Thread Starter
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Replacing my engine dampener mounts for vibration issues

My vibration issue, temporarily improved, is back. Right around 3K RPMs my bike is humming enough to cause my keys and even my Stebel horns to rattle. My freakin' LICENSE PLATE actually rattled loose, and I almost lost it (it's a vanity plate so it would have been pretty annoying).

Reading the service manual, it says that the most likely cause is a need to replace shrunken or rotted rubber dampeners. Otherwise, if it's something going on inside the engine, it's a pull job with dissassembly (beyond my prowess or patience).

I can visually identify the rubber dampeners for the main frame bolts as being shrunken, the bolts are tightened as tight as I can with a torque wrench but there's still about two millimeters of gap. So I'm hoping that's all it is.

Replacing dampeners should be simple enough, right? On BikeBandit, I went to the Engine Mount schematic and identified the following parts:

92075A: DAMPER, ENGINE MOUNT (631690-001) @ $21.94
92075B: DAMPER, ENGINE MOUNT (631692-001) @ $28.09
92075: DAMPER, ENGINE BRACKET (631689-001) @ $15.22

(The 92075s that are the front, attached to what are labeled 92002 and 92015, are the ones I can visually see look shrunk compared to the ones on my other, non-vibrating VN750.)

Has anybody experienced this kind of vibration that was fixed by replacing just these dampers?

Also, I can't quite tell from the BikeBandit diagram how many of these I'll need. There are so many parts labeled "92075". Do I need TWO of each of the three parts, one for each side of the bike, or just one?

"Until you have the courage to lose sight of the shore, you will not know the terror of being forever lost at sea." (Despair.com)

Last edited by robardin; 01-13-2010 at 10:28 AM.
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post #2 of 7 (permalink) Old 01-13-2010, 10:48 AM Thread Starter
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Just tried the "Live Chat" feature on BikeBandit, the guy told me the full complement comes to:


4x of 92075A: DAMPER, ENGINE MOUNT (631690-001) @ $21.94
2x of 92075B: DAMPER, ENGINE MOUNT (631692-001) @ $28.09
6x of 92075: DAMPER, ENGINE BRACKET (631689-001) @ $15.22

Which comes to $235.26 in parts before my AMA discount.

Whew! Before I do this then I want to make sure this has a good chance of doing what I want it to do... And a better idea of what's going to be involved in swapping them in. Am I going to have to remove the engine? Looking at the diagram I can't see how that wouldn't be the case for some of the inside ones. Yikes!

"Until you have the courage to lose sight of the shore, you will not know the terror of being forever lost at sea." (Despair.com)
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post #3 of 7 (permalink) Old 01-13-2010, 04:46 PM
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That seems like alot of money there. Perhaps you could try just picking up some rubber washers at Lowes and see if you can isolate the motor a bit more yourself.

I think some of the mounts would require you to move the motor to replace...(move, not remove)

If you study how each mount is supposed to work you might be able to rig something yourself without spending as much cash.

Do not forget to install new muffler mounts if needed too, I had a bike that shook abit when the throttle was opened and I found the owner had replaced the stock rubber dampeners holding the exhuast on with metal bushings.

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post #4 of 7 (permalink) Old 01-13-2010, 05:24 PM Thread Starter
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Quote:
Originally Posted by Knifemaker View Post
Do not forget to install new muffler mounts if needed too, I had a bike that shook abit when the throttle was opened and I found the owner had replaced the stock rubber dampeners holding the exhuast on with metal bushings.
Huh, I hadn't thought of that. Would that really cause the whole bike to shake? I guess so, since a lack of dampening at any part which needs it would by definition cause vibration, and once the part touches the frame that's all she wrote.

Gonna look that part up later tonight then. It would be funny (but not really ha-ha funny) if that was the main contributing factor.

"Until you have the courage to lose sight of the shore, you will not know the terror of being forever lost at sea." (Despair.com)
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post #5 of 7 (permalink) Old 01-13-2010, 10:57 PM
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Cheapcycleparts.com has them for $167.30 for the full set.





Jeff Brooks
Owensboro KY
'94 Vulcan 750

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post #6 of 7 (permalink) Old 01-29-2010, 05:40 PM Thread Starter
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Drat, it wasn't the rubber mounts

I ended up taking it in to a mechanic who (a) could take the engine out, which I don't feel comfortable attempting on my own for the first time and (b) could look at it in a heated garage, it's freakin' 15F here all of a sudden!

Turns out it was the balancers in the engine. 8 hours of labor to get at it, fix it and put it all back in. Ouch. But it's done, and done right, so I'm glad.

He says it was probably a factory defect. I got my bike last year as a twice-owned 2004 VN750 with only 555 miles on it. I thought it vibrated "a little" but over time I decided it was "too much". It's probably why it had so few miles on it. Too bad the original owner didn't get it fixed under warranty. Now I get to shell out a double handful of C-notes instead, after paying a relative premium to get a bike with low miles specifically for the engine life

Oh well, at least it's taken care of!

"Until you have the courage to lose sight of the shore, you will not know the terror of being forever lost at sea." (Despair.com)
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post #7 of 7 (permalink) Old 01-29-2010, 07:29 PM
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Well it sucks that you had to blow the cash...but if it fixed the problem than you are at least over all the other headaches of trying to figure out whats wrong and have a bike you can now enjoy riding.( weather permiting...lol)

I do know alot of folks often say they are impressed with how smooth the Vulcan feels...compared to other V-twins, so I would not be surpised to hear that the original owner just thought the vibration was something inheirent with the bike and never questioned it.

Anyway, glad to hear the issue is resolved and you can get on with the fun part of owning the bike..........

KM

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