Author Topic: Outer Fork Tube Bushings  (Read 902 times)

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Offline JDSCO

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Outer Fork Tube Bushings
« on: March 28, 2018, 03:27:57 pm »
The C14 Outer Fork Tube contains 2 bushings (per side) that accept the Inner Fork Tube, ref KYB 43
Kaw sells the Outer Tube, w/ bushings installed, for $290 each, $600 bucks, thanks you very much
My 2008 C14 had 40k miles and those bushings were showing signs of "slop" or wear
My 2016 doesn't show any wear at 10K miles but these bushing do wear
When they do wear, minute particulates are now suspended in the fork oil and do flow through the working suspension
This is one good reason for changing fork fluid more than once every 30K miles, as some have stated

If you are so inclined, you can remove the oem bushings and replace them
I've read several posts, in two forums, and they have stated that the bushings can be, and have been, replaced by purchasing a "bushing kit" but these posts do not reference any aftermarket part number or dimensional spec
The FSM does not reference this, whatsoever

I would like to have a "set" on hand for this eventuality

Has anyone actually replaced these existing bushings?

Does anyone have a dimensional reference/aftermarket pN on these bushings?
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Offline Deepsea

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Re: Outer Fork Tube Bushings
« Reply #1 on: March 28, 2018, 03:55:21 pm »
Do you have a way to objectively measure the bushing wear without disassembling the forks?
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Offline JDSCO

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Re: Outer Fork Tube Bushings
« Reply #2 on: March 28, 2018, 04:22:49 pm »
There is no way to accurately measure anything, other than the inner fork tube o.d., assembled
I could barely feel a out-of-round condition in the lower bushing, assembled with seals, which prompted a telescope gage and mic once the fork was disassembled
Some could assume that's steering head bearing play but my experience shows the bushings do wear

It showed that there was .006 out-of-round which I remedied by rotating each fork leg 90deg at reassembly into the triple clamp

That eliminated the play (you can see bushing wear on any used fork bushing)
It's the lower bushing, the forward quadrant of that bushing that sees the most wear of the two
The top upper bushing, rearward quadrant of that bushing, sees lesser wear and is quite difficult to measure if you don't have a deep bore-gage or deep telescoping gage

This experience is from my 2008 not the new one
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Offline Deepsea

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Re: Outer Fork Tube Bushings
« Reply #3 on: March 28, 2018, 04:50:25 pm »
I agree. :beerchug:
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Offline Syxxphive

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Re: Outer Fork Tube Bushings
« Reply #4 on: March 28, 2018, 07:01:10 pm »
Seeing as the upper bushing is not attached to the stanchion in at way, how would one go about replacing it? With an expanding puller, one could probably get to the lower one though.

Offline JDSCO

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Re: Outer Fork Tube Bushings
« Reply #5 on: March 28, 2018, 09:11:55 pm »
^ As with wheel bearings, a nice maple 1x2 or 1" dia dowel works really well as a drift
I'm "assuming" that the upper bushing presses in from the bottom of the outer tube and inversely presses out from the top toward the bottom
Both bushings are not split bushings

I talked with Traxxion...
It appears that this "outer tube/bushing arrangement" has a design advantage in that there is no wear against any aluminum inner surface, just wear between the bushing i.d. and the lower inner tube's chrome plated/hardened surface
This contributes to a less-contaminated fork oil, remaining free of most particulates
On other bikes, one bushing is attached to the lower inner tube and it's bearing surface is against the i.d. of the outer tube

I didn't think of that!

Unfortunately, it costs <$600 to remedy this "wear"
Looks like changing fork oil regularly is a good practice for yet another reason
I change fork oil in my bikes more than most folks do

Looks like Kaw might win this one, justifiably or not!
« Last Edit: March 28, 2018, 09:22:04 pm by JDSCO »
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Offline Syxxphive

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Re: Outer Fork Tube Bushings
« Reply #6 on: March 29, 2018, 12:26:56 am »
Might by why they did it that way

Offline Gixerhp

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Re: Outer Fork Tube Bushings
« Reply #7 on: March 29, 2018, 03:56:32 am »
The bushings can be removed, just need to find a source for them. Older fork had replacements, but these newer styles, dont.
Ill do some research and find them.
I found the correct size a while back for a customer with a Busa, that kept blowing fork seals, once we replaced the bushing the problem was solved.
I will have my forks apart this week to install my AK20 cartridges, and get measurements while there apart
 
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Offline Deepsea

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Re: Outer Fork Tube Bushings
« Reply #8 on: March 29, 2018, 06:31:25 am »
You might try http://www.kyleusa.com as a source for bushings. Before I purchased a set of Ohlins forks from them we discussed re-springing a set of ZX14 forks and they indicated they could replace the bushings at the same time. If you call ask for Keith, he's the owner.
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Offline JDSCO

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Re: Outer Fork Tube Bushings
« Reply #9 on: March 29, 2018, 03:00:04 pm »
I will have my forks apart this week to install my AK20 cartridges, and get measurements while there apart

Thank you for that!
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Offline JDSCO

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Re: Outer Fork Tube Bushings
« Reply #10 on: March 29, 2018, 03:09:59 pm »
You might try http://www.kyleusa.com as a source for bushings.


Thanks, Talked with Kyle, he couldn't offer anything regarding replacement bushings on Kaw OEM's
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Offline Syxxphive

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Re: Outer Fork Tube Bushings
« Reply #11 on: March 29, 2018, 04:27:38 pm »
Does anyone what alloy of bronze these are? If there’s a demand for them, I might be able to start producing some at work.

Offline JDSCO

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Re: Outer Fork Tube Bushings
« Reply #12 on: March 29, 2018, 10:00:47 pm »
^^Thanks for that Jess
They're a ferrous metal bushing with a teflon-based, copper clad, low friction "fm" coating
Some of the Ohlin's have a similar outer-tube bushing design, by the way, as do other fork mfr's.
I'm thinking that AllBalls Racing has dimensional bushings but they do not want to assume any liability with parts not specifically intended for this application

These bushing are out of my KTM with WP 48mm inverted's
These bushing are split and Kaw's are not split

« Last Edit: March 29, 2018, 10:04:10 pm by JDSCO »
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Offline Freddy

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The best substitute for brains is ..............what?

Offline Syxxphive

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Re: Outer Fork Tube Bushings
« Reply #14 on: March 30, 2018, 01:58:48 am »
^^Thanks for that Jess
They're a ferrous metal bushing with a teflon-based, copper clad, low friction "fm" coating
Some of the Ohlin's have a similar outer-tube bushing design, by the way, as do other fork mfr's.
I'm thinking that AllBalls Racing has dimensional bushings but they do not want to assume any liability with parts not specifically intended for this application

These bushing are out of my KTM with WP 48mm inverted's
These bushing are split and Kaw's are not split

Well, unfortunately that option is out. I wasn’t aware they were coated. Thought they were a simple bronze bush. 😞 was certainly worth a shot. I couldn’t begin to approach a reasonable cost if they’re clad and coated. Sorry guys.

Offline JDSCO

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Offline MAN OF BLUES

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Re: Outer Fork Tube Bushings
« Reply #16 on: March 31, 2018, 06:29:16 pm »
https://pyramid-parts.com/collections/fork-bushes

Awesome find....!!!!!!
Somebody make this a sticky in the replacement parts section.... pleeeeeeze....

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Offline Syxxphive

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Re: Outer Fork Tube Bushings
« Reply #17 on: March 31, 2018, 07:16:12 pm »
https://pyramid-parts.com/collections/fork-bushes

Awesome find....!!!!!!
Somebody make this a sticky in the replacement parts section.... pleeeeeeze....
MOB, would a split bush work in our forks? Even though ours are solid?