Change your fork oil - TwoWheelForum: Motorcycle and Sportbike forums
 
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post #1 of 16 (permalink) Old 03-27-2005, 08:22 PM Thread Starter
 
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Lightbulb Change your fork oil

I just swapped my fork oil after about 5,000 miles (1 1/2 years).

This was definitely much needed maintenance. See the attached photos. Red fluid is the Honda/Showa fresh fluid SS-8 10W and the black stuff is what came out.
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post #2 of 16 (permalink) Old 03-27-2005, 08:59 PM
 
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And how hard was it?
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post #3 of 16 (permalink) Old 03-27-2005, 10:05 PM Thread Starter
 
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Not to bad for my first go at it. The next time will take less than one hour.

I swapped the stock springs with Racetech springs. The oil swap only took about two hours. I spent a lot of extra time working the damper rod to get all the old fluid out and then work it again to get new fluid working through the rod before assembly. I measured in the fluid 50ml at a time to get exactly the same amount in as recommended (a little anal retentive on the measurement stuff).

I spent another hour and a half measuring the old spring and spacer stack and cutting the new ones. I ended up with about .001" difference. A lot of measure twice and cut once and taking my time. I don't know if the precision is necessary, but it is easier to do then find out later and redo.

I'm fabbing up a shock spring compressor to swap that out with a Racetech spring this coming weekend.

The info I got from some of the other posts helped a lot. When I started taking things apart it did not seem total new.
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post #4 of 16 (permalink) Old 03-27-2005, 10:24 PM
 
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Wow... that's pretty nasty stuff! I guess I too need to look into doing this as well
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post #5 of 16 (permalink) Old 03-27-2005, 10:41 PM
 
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Quote:
Originally Posted by f4ilapper
...I'm fabbing up a shock spring compressor to swap that out with a Racetech spring this coming weekend...
I applaud you for doing the work yourself. But you have to be careful on your next project with the shock spring. I have a simple lever-type changer for changing springs, but it's for when bikes had two shocks. The single shock spring stores twice as much destructive energy.
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post #6 of 16 (permalink) Old 03-27-2005, 10:50 PM
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Yep, I got the fluid, bushings, and seals changed on my 9R forks... Ohlins oil and WOW!!!! What a difference!!!!! I love it!!




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post #7 of 16 (permalink) Old 03-27-2005, 11:00 PM Thread Starter
 
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Got it. Thanks for the heads up. I'm going to give it a shot. I've got my back up plan for someone to swap it if I can't fab up something strong enough.

This is what I'm working on.
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post #8 of 16 (permalink) Old 03-28-2005, 01:56 AM
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That handle looks short. (it might just be the pic)
You might have to get some extra leverage for 100lb's+

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post #9 of 16 (permalink) Old 03-28-2005, 07:26 AM
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Quote:
Originally Posted by f4ilapper
Got it. Thanks for the heads up. I'm going to give it a shot. I've got my back up plan for someone to swap it if I can't fab up something strong enough.

This is what I'm working on.
You using that for a front stand????

Get one of these...

Pit Bull front steering head stand

of coarse you'll need a rear stand to use it...

Or one of these "mc lifts".... check that thread for more info it...



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-Chris
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post #10 of 16 (permalink) Old 03-28-2005, 07:58 AM Thread Starter
 
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I'm using both Pitbull front-forklift and rear stands to hold the bike. The pic was of a rear shock spring compressor.

Quote:
That handle looks short. (it might just be the pic)
You might have to get some extra leverage for 100lb's+-Jeeps84

I'm also considering one that has two threaded rods and a 1/4" plate at each end. It seems a little safer and should have pletty of strength.

Thanks for the advice and words of caution.
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post #11 of 16 (permalink) Old 03-28-2005, 11:18 AM
 
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We've changed people's fork oil that hadn't done it in years. Man, that stuff stinks! It'll stink up the whole 4,000 sq ft shop in no time flat. Yuck!
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post #12 of 16 (permalink) Old 03-28-2005, 11:29 AM
 
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on this subject. i thought that oil color did not mean that it is bad, casue i knwo motor oil will color like right after you runn it for a little.
is this the same with fork fluid?
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post #13 of 16 (permalink) Old 03-28-2005, 01:31 PM Thread Starter
 
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Here's my worth of understanding.

The color indicates the degree of contamination from everything moving and amounts of external dust that comes in around the seal. The way the fork oil is being used is different than that of engine oil as a coolant. In the fork the fluid is one of the working component that it's viscosity as it is moving through the valves is directly related to the performance, how fast or slow it flows. Where as in the engine it is just a coolant and to flush contaminents from moving parts. In the engine there are more moving parts and more friction related contaminents, a little bit from everything makes it dirty. In the fork there are only a few moving parts, less parts means more friction per part to get the same dirty oil.

I'm not sure if this makes sense reading it. Hope it helps.
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post #14 of 16 (permalink) Old 03-28-2005, 01:42 PM
 
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yup, i was just curious.
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post #15 of 16 (permalink) Old 03-28-2005, 02:53 PM Thread Starter
 
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This forum and the dialog made it a lot easier diving in and doing it myself. The info that Speedwerks, Twisty, Gas Man, and others put up helped out a lot. For the $12 or so for new fluid it is a cheap insurance to keep the bike working ok.
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post #16 of 16 (permalink) Old 03-28-2005, 10:23 PM
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Quote:
Originally Posted by SpeedWerks.com
We've changed people's fork oil that hadn't done it in years. Man, that stuff stinks! It'll stink up the whole 4,000 sq ft shop in no time flat. Yuck!
That's what the shop owner said...

F4i... glad we could all help and I give ya for goin' at yourself!!!




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Was: 2002 Kaw ZX-9R
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is me till the
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