Author Topic: Fork oil change tips?  (Read 575 times)

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Offline angelo

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Fork oil change tips?
« on: November 06, 2017, 07:25:28 pm »
Hi all.  It is past due.  Have changed fork oil on several other bikes.   Also have a factory manual.  BUT almost always learn more in this format from folks with experience. 

Pretty happy with performance so thinking same weight oil.  Thoughts?

I understand later models than my 08 have more oil.  Worth doing or stay at stock 08 oil level height?   

Plan on using pump to drain and refill.  Any tips for removal of springs, parts?   Any special tools needed if not doing seals?

As I said, have done this job on several bikes but not that often and it’s been several years.  Any tips ideas time savers welcome. 

Offline Syxxphive

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Re: Fork oil change tips?
« Reply #1 on: November 07, 2017, 02:05:14 pm »
Really not too bad of a job. If you’re changing oil, it’s not much further to just change the seals. One the top cap is off, the halves separate. You’ll need a spring compressor tool and a ratchet strap to compress the spring enough to get the top cap off the cartridge. If you don’t want to go that far,that’s fine. As long as your seals aren’t leaking at all.

Before you remove the front tire, loosen the pinch bolts on the top and break the torque on the top cap. It’s a 24mm. Once it’s a bit loose, proceed, as normal, remove the tire, the fender, the calipers (they don’t have to come off the bike entirely, just off the fork). I believe the bottom triple tree pinch bolts are 11 or 12mm. Loosen them and pull the forks out. Loosen the tube from the top cap, it should spin by hand if you broke the torque while everything was still assembled. Dump and allow to drain. Refill to proper level.

I would suggest removing the top cap altogether though so you can actuate the cartridge and bleed the system out. And if you’re removing the top cap, might as well change the seals. If you’re a paying member, I have a set of tools belonging to Old Man on a Connie (Mark Hartman) that is available for member use. I can ship them to you. Has everything you need to change the seals, minus a ratchet strap.
« Last Edit: November 07, 2017, 02:12:08 pm by Syxxphive »

Offline gsun

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Re: Fork oil change tips?
« Reply #2 on: November 08, 2017, 02:08:24 am »
I might take you up on the tool loan sometime this winter. Going to bookmark this thread!

Offline ghostrider990

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Re: Fork oil change tips?
« Reply #3 on: November 09, 2017, 12:10:20 am »
Whats the FSM recommended Service Interval for changing the Fork Oil??

I'm too lazy to go pull mine out.  ::)

gr
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Offline Syxxphive

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Re: Fork oil change tips?
« Reply #4 on: November 09, 2017, 02:08:14 pm »
Whats the FSM recommended Service Interval for changing the Fork Oil??

I'm too lazy to go pull mine out.  ::)

gr

Doesn’t give one. For what it’s worth, I’ll be doing mine every 30k miles. Probably do the seals at the same time too.

Offline sfsokc

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Re: Fork oil change tips?
« Reply #5 on: November 16, 2017, 02:34:17 am »
I realize that Fred outlines this in his videos, which I make plenty good use of.  If there's no schedule specified in the owners manual, why should it be done? Can one really feel when it needs it?  Or is there even any perceptible change after changing it?  This sounds like one of those "way back burner" jobs, compared to everything else you can (and need) to do, and I imagine many people put tens of thousands of miles on their bike never performing it.

Offline Old Man on a Connie

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Re: Fork oil change tips?
« Reply #6 on: November 16, 2017, 03:09:35 am »
Really not too bad of a job. If you’re changing oil, it’s not much further to just change the seals. One the top cap is off, the halves separate. You’ll need a spring compressor tool and a ratchet strap to compress the spring enough to get the top cap off the cartridge. If you don’t want to go that far,that’s fine. As long as your seals aren’t leaking at all.

Before you remove the front tire, loosen the pinch bolts on the top and break the torque on the top cap. It’s a 24mm. Once it’s a bit loose, proceed, as normal, remove the tire, the fender, the calipers (they don’t have to come off the bike entirely, just off the fork). I believe the bottom triple tree pinch bolts are 11 or 12mm. Loosen them and pull the forks out. Loosen the tube from the top cap, it should spin by hand if you broke the torque while everything was still assembled. Dump and allow to drain. Refill to proper level.

I would suggest removing the top cap altogether though so you can actuate the cartridge and bleed the system out. And if you’re removing the top cap, might as well change the seals. If you’re a paying member, I have a set of tools belonging to Old Man on a Connie (Mark Hartman) that is available for member use. I can ship them to you. Has everything you need to change the seals, minus a ratchet strap.
Glad to see these tools making the rounds. Pay it forward  :beerchug: :great:
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Offline Syxxphive

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Re: Fork oil change tips?
« Reply #7 on: November 16, 2017, 01:31:14 pm »
No ones requested them from me yet, but I do the make offer!

BTW, if I remember before someone requests them, the syringe needs to be replaced. The seal on the plunger is totally shot. Had a hard time making it work. I think the rubber just dried out. I’ll see what I can find.

Offline Old Man on a Connie

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Re: Fork oil change tips?
« Reply #8 on: November 16, 2017, 09:43:01 pm »
No ones requested them from me yet, but I do the make offer!

BTW, if I remember before someone requests them, the syringe needs to be replaced. The seal on the plunger is totally shot. Had a hard time making it work. I think the rubber just dried out. I’ll see what I can find.
I think I put a big O ring on there. Have some more if you can measure. Dia and cross section. Usually the fork oil gets contaminated with itty bitty pieces of the bushings.
"I don't always ride street bikes, but when I do, It's a Concours. A C14 '11 silver to be precise." OTP 2017 Traveler. It was a Blast Baby.

Offline Syxxphive

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Re: Fork oil change tips?
« Reply #9 on: November 17, 2017, 12:31:19 am »
I’ll measure it and see if I wrangle up a new o-ring then.

Offline JTX

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Re: Fork oil change tips?
« Reply #10 on: November 20, 2017, 10:28:18 am »
Whats the FSM recommended Service Interval for changing the Fork Oil??

I'm too lazy to go pull mine out.  ::)

gr


As with the rest of the group, I was very surprised there was not any mention of it in the end-user manual that comes with the bike, or the SERVICE MANUAL.


But as another poster said, 30K may be the general area I do mine.  Sometimes it's obviously needed like when the bike front end bounces.  But it's probably OVER DUE by that point.


So once again it was very disappointing theres no interval set by KAW, yet they want you to change the spark plugs at 7500 miles.  So, one ride and I have to change the spark plugs???????




Online 4Bikes

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Re: Fork oil change tips?
« Reply #11 on: November 20, 2017, 10:43:11 pm »
I waited almost 50,000 miles to change my fork oil. I removed the forks and shipped them off to Traxxion for the AK-20 upgrade. Fresh oil and new suspension.
Silver 2011 C-14. Previous rides: KZ-400, KZ-750, KZ-1000.  Keep the rubber side down.  Ride Fast......Live Slow......

Offline JTX

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Re: Fork oil change tips?
« Reply #12 on: November 21, 2017, 10:41:34 am »
I waited almost 50,000 miles to change my fork oil. I removed the forks and shipped them off to Traxxion for the AK-20 upgrade. Fresh oil and new suspension.


What'd that cost?

Offline angelo

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Re: Fork oil change tips?
« Reply #13 on: November 21, 2017, 11:30:42 am »
Thanks for the info guys.   Yes I guess just feel the need to change out of past habits.  Valve adjust last winter so never got to this. I am at somewhere around 42k miles.  So just assumed past due.  No negative warning signs but you know how wear items - like fork oil- kind of steadily degrade and it creeps up on us without noticing.  Until one addresses and we hear singing in the vast improvement. 

Online 4Bikes

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Re: Fork oil change tips?
« Reply #14 on: November 21, 2017, 12:20:02 pm »
I waited almost 50,000 miles to change my fork oil. I removed the forks and shipped them off to Traxxion for the AK-20 upgrade. Fresh oil and new suspension.



What'd that cost?

If I remember correctly, it was around $2,100 with a 10% COG discount.  I also got the Rear Penske 8983 at the same time, and it totally transformed the ride.  I had basically the same question as Angelo in his first post, and ended up going with the upgrade.   Since I'm keeping my C-14, I figured why not make it better, along with addressing a maintenance item.

Here is the thread that has all of the details.
http://forum.cog-online.org/tires-suspension-c14/forked-up-service/
Silver 2011 C-14. Previous rides: KZ-400, KZ-750, KZ-1000.  Keep the rubber side down.  Ride Fast......Live Slow......

Offline JTX

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Re: Fork oil change tips?
« Reply #15 on: November 21, 2017, 01:05:56 pm »
Thats a lot.  I bet worthwhile however.

Offline Syxxphive

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Re: Fork oil change tips?
« Reply #16 on: Yesterday at 12:49:10 am »
I waited almost 50,000 miles to change my fork oil. I removed the forks and shipped them off to Traxxion for the AK-20 upgrade. Fresh oil and new suspension.



What'd that cost?

If I remember correctly, it was around $2,100 with a 10% COG discount.  I also got the Rear Penske 8983 at the same time, and it totally transformed the ride.  I had basically the same question as Angelo in his first post, and ended up going with the upgrade.   Since I'm keeping my C-14, I figured why not make it better, along with addressing a maintenance item.

Here is the thread that has all of the details.
http://forum.cog-online.org/tires-suspension-c14/forked-up-service/


Super jealous of that setup. Hopefully I’ll be able to upgrade my suspension soon.