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Discussion Starter #1 (Edited)
Hey guys, Matthew Wellington recently posted in frustration about the lack of availability on the rubber engine dampers that commonly fail / need replacement on our VN750's. I confirmed with Partzilla there was indeed a national backorder on damper 92075-1747. At the time of the call, all they could tell me was there was no ETA for future fulfillment and that the part was still active and not discontinued (marked obsolete) in the Kawasaki parts catalog. Given how common it is for the dampers to fail and need replaced I was uncomfortable having so little information and uncertainty regarding this critical part. So I took it upon myself to contact Kawasaki directly on behalf of us all to get answers. Here's what I was told...

The damper is still active in Kawasaki's parts system but given the age of our bikes, as of now Kawasaki ONLY fulfills orders for the dampers on a "as requested" basis. As of right now, 20 of the 92075-1747 dampers will be shipped from Kawasaki to partnered Kawasaki parts dealers and dealerships on September 9th to fulfill backorders. The order for these 20 dampers was processed June 7th. So it "appears" there is roughly a two month wait (backorder) time to get dampers from your dealer / internet parts vendor (Partzilla, Ron Ayers, etc). The customer service agent at Kawasaki agreed with my deduction (2 month lag time to fulfill) but cautioned I (we) should not take this to be set in stone.

I explained to her (Cathy) that the dampers on the VN750 is arguably (vs stator) the single highest reason to pull the engine out of the frame for internal engine service. I stressed there is no aftermarket provider of these dampers and urged for greater quantities of the dampers to be produced. I asked to speak with the person or department responsible for decision making regarding part ordering / fulfillment at Kawasaki to explain and make a case (on behalf of us all as a community) for increased damper production. Cathy told me she did not have the authority to directly put me in direct contact. She did however, take my email address and phone number saying she would contact them on my behalf asking them to contact me directly about the damper's. Cathy additionally noted that authorized dealers and part vendors have the ability to speak with the department in charge of ordering parts to make a case / argument to increase supply.

What you should take away from this is....

1) Should you need dampers (and Ebay does not have any or enough to make a full set (6) for sale), order them from your dealer / parts vendor and be prepared to wait months for them to show up at your doorstep.

2) The dampers are being made available for sale based on backorders ONLY at this point. Dont make the mistake of waiting for them to show up in dealer / parts vendor stock!

3) If you have not already replaced your engine dampers or have high miles on the set you previously changed out, would be wise to order a full set of dampers now so that you are not forced to garage your VN750 and wait months for replacement dampers when yours fail. For quick reference, a full set of replacement engine dampers consists of....


4x - 92075-1747

2x - 92075-1748


See thtanner's "How To" thread for a complete list of "other" parts you will need additionally to change out the dampers (link below)

http://www.vn750.com/forum/31-engine-exhaust-cooling/21031-balance-damper-installation.html

If / when I get a response from the decision makers in the parts fulfillment department at Kawasaki I will promptly share what they had to say.
 

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Discussion Starter #3
Wonder how a set of Delrin bushings would work?

Just have these folks cut 500 or so: Delrin® | Plastic Sheets and Rods | Alro Plastics

Can get an 7/16" x 8ft Delrin rod for $35.
Provided Delrin was interested in making these for us, for starters I would imagine they would need 1 new 1747 and 1748 damper for reference (weigh, measure, etc). Then I'm confident there would be shared universal concern for how well Delrin's (plastic?) bushing / damper would hold up inside our engines. How well they endure the unique stresses, heat, vibration absorption, durability, and long term exposure to oil. To "sell" these as a viable alternative, someone would have to be willing to install a "test" set and log 1000's of miles with good results before "some" of us would be even willing to consider buying & using them instead of the oem rubber dampers in our bikes.

I encourage and welcome "out of the box" thinking for sourcing another alternative, but unless Delrin or other parts manufacture is willing to make a exact (or near) clone of the OEM part, it's going to involve a lot of groundwork and careful transparent testing to convince us collectively to use (buy) the "new suppliers part" (over the OEM dampers) in enough quantity to justify their efforts.
 

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I think a set of five all the same (smooth sides) would work, probably not much magic in those two ridged OEM bushings.

Delrin is a trademark of DuPont, now known as Chemours. Probably the toughest bushing you'll find that's not all metal.

The Alro company was just the first link I found offering it, along with cutting and CNC services. I could probably go out tomorrow and find Delrin rod cheaper, it's made here.
 

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Still would need the steel sleeve inside them. Thats gonna add a lot to the delrin parts cost. And with our luck, the sleeve is not an easily obtainable size
 

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Still would need the steel sleeve inside them. Thats gonna add a lot to the delrin parts cost. And with our luck, the sleeve is not an easily obtainable size
Maybe, maybe not. The Delrin is probably tough enough to run without a metal sleeve. There's no rotation on the damper weight posts, and we don't know the reason OEM chose the sleeve or the material for the bushing. Cost maybe? Delrin bushings get cut in machine shops all over, to keep factory machinery running.

There may be a better material than Delrin, but that's the one I know something about, and it machines very well. If the stock rod diameter fits, that leaves one operation to put a hole down the center. If not, then it's another operation to turn the outside diameter.

Not sure about running with no damper. Would have to modify both ends of the damper shaft, there's weight on both ends. And the shaft drives the oil pump. Probably still a pretty buzzy ride at best.
 

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FREEBIRDS MC CENTRAL NY
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This may be a stupid question (I ask one every few decades ;) ). But how badly would the Vulcan run if you simply removed the balancers from the engine?
smooth as a crackhead on payday.balancers are made for balancing. I don't think the engineering department would put them inside the engine for no reason.

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smooth as a crackhead on payday.balancers are made for balancing. I don't think the engineering department would put them inside the engine for no reason.

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Well there was a reason...to make it run "smooth". The Vulcan motor is rubber mounted AND balanced. Remember there are Harley's that are rubber mounted, but not balanced. (There are ones that are balanced and not rubber mounted)

The issue with the Vulcan balancers going out is they self destruct and tear through the engine case. Obviously if they were not there to begin with the engine, still rubber mounted, would vibrate more. My question is would this be intolerable or would it only be as bad as an unbalanced Harley?
 

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^ yeah, but if I want to ride a unbalanced motorcycle, then I'll just buy a Harley. :doh:

yup, "smooth as a crackhead on payday." classic! :rockon:
 

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worse.the Harley motors aren't externally balanced but are somewhat mechanically balanced.I don't know how to explain it on a keyboard,persay, but I'll try.it has to do with rotational mass and laws of motion and gravity.the weight of all the parts on the Harley all have a better rotational mass than the Vulcan parts,hence the need for balancers.

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FREEBIRDS MC CENTRAL NY
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oh and they do more than tear up the case,they vibrate as bad as a sybian machine.good for the ladies,bad for the Vulcan

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There's quite a few bushings on ebay, but they are $10-12 each, plus shipping, and you have to search around to find the two magic ribbed ones.

Saw one listing with the same 92075-1748 part number, but the ad said it was for a Vulcan 800, so maybe they crossover.

Well, $4.22 + $4.88 shipping in a couple of listings.

So if Delrin scares people, how about steel?
 

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Discussion Starter #14
There's quite a few bushings on ebay, but they are $10-12 each, plus shipping, and you have to search around to find the two magic ribbed ones.

Saw one listing with the same 92075-1748 part number, but the ad said it was for a Vulcan 800, so maybe they crossover.

Well, $4.22 + $4.88 shipping in a couple of listings.

So if Delrin scares people, how about steel?
The round 1747 damper is unique to the VN750 and does not crossover.

The cog shaped 1748 damper is used in our engines and the 95-06 Vulcan 800 Classic

I'm not syaing the Delrin scares me, rather pointing out I suspect people will be hesitant to use them over the OEM ones without descent mileage data and feedback from a member willing to brave the untested dampers.
 

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The round 1747 damper is unique to the VN750 and does not crossover.

The cog shaped 1748 damper is used in our engines and the 95-06 Vulcan 800 Classic

I'm not syaing the Delrin scares me, rather pointing out I suspect people will be hesitant to use them over the OEM ones without descent mileage data and feedback from a member willing to brave the untested dampers.
That's why I listed the 1748 part number.

Have you ever held a set of dampers in your hand? They are nothing special, kinda sh!tty actually. I think Delrin is a few steps up.

My dampers are new and I don't see me riding enough to wear them out out. But if I needed a set this week, I could have some made, with Delrin, brass, steel, inconel .....

Give Kawi enough time to drag their feet, somebody, somewhere, will be making them, even if they only make one set. The 750 is already 10 years out of the last production date, Kawi has no legal obligations to this model at all. What do you think the beancounters will say?
 

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I think the best recourse right now is for Everyone who has a Vulcan that has not replaced their dampeners to go to your local Kawasaki dealer and order a set.
Perhaps if they see a large increase in demand they might be more obliged to fill it.

As far as running the bike without them....I again counter with the fact I did say it might have been "a stupid question" , but will also point out that no one has done it .....so we really do not know for sure how badly the bike would vibrate. If in the future Kawasaki ceases making this part, and no one steps up to do so, it will either be this or the death of the model.
 

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Discussion Starter #17 (Edited)
I think the best recourse right now is for Everyone who has a Vulcan that has not replaced their dampeners to go to your local Kawasaki dealer and order a set.
Perhaps if they see a large increase in demand they might be more obliged to fill it.

As far as running the bike without them....I again counter with the fact I did say it might have been "a stupid question" , but will also point out that no one has done it .....so we really do not know for sure how badly the bike would vibrate. If in the future Kawasaki ceases making this part, and no one steps up to do so, it will either be this or the death of the model.
I think this is a good idea. I don't think were in any danger of Kawasaki making the part obsolete and discontinuing it any time soon, rather the hope / goal is to get them to produce MORE per batch and go back to maintaining a positive inventory of the dampers vs the new standard of order and wait months to get a set. The dampers are a wear and tear parts like engine rings or clutch discs so going "used" (a good option for many parts) is really not a option.

I have a glass half full attitude regarding the notion that without Kawasaki producing the dampers, our VN750's will die out. Necessity is the mother of all inventions and I'm fully confident someone among us would discover or manufacture replacement dampers if that was the only option. I have a 1983 Honda CX650 Custom sitting in my garage. The bike / engine was only made in the United States for ONE year. Most of it's parts have been discontinued by Honda for 10+ years and guys have come up with numerous ingenious ways of keeping their CX650C's on the road. For example, engine rings have not been made for over a decade and given the age / mileage of these bikes is a frequently needed part. So one member of the CX650 community (vastly smaller than our own) took a used engine ring to work with him at Autozone and went through box after box of engine rings until he found engine rings for a Hyundai Elantra that with a very simple mod work perfectly in the CX650's engine. No matter what Kawasaki does, we will find a answer to keep our bikes moving down the road... :motorcycl
 

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Sorry to cause all this obsurdity in the community. I made about 20 different phone calls to all the venders I could and no one would supply the part from inventory. All back order. This is my daily driver so I didn't have time to wait for new. I put a good used set in and hope for the best. I do have 2 sets on back order just for the futures sake.
 

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I ordered mine, along with some additional gaskets, from Ken's Sports, Inc.
They filled my order pretty fast and everything came in a short time.

www.kenssports.com
 

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I guess the price has just naturally gone up in three years. It was $40-45 for a set, now roughly $60-65.
 
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