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Offline Kris

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Changing Fork Oil without Special Tools?
« on: February 02, 2018, 01:32:01 PM »
I think it is time to change my fork oil.  I got the synthetic 10W Motul Oil which is probably better than the OEM oil and has approx the same viscosity.  I live far away from any service center so I wonder if any special tools are needed to make the job done, like spring compressor, etc.? 

Offline KildareMan

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Re: Changing Fork Oil without Special Tools?
« Reply #1 on: February 02, 2018, 02:16:25 PM »
You will need the spring compressor and the fork thing to hold the spring and cup washer clear of the nut - for which you need a 16mm spanner.  Bought mine as a kit.  Not expensive.  Also came with an extension piece for the damper rod making it easier to exercise the damper rod when emptying and filling.
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Offline Kris

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Re: Changing Fork Oil without Special Tools?
« Reply #2 on: February 02, 2018, 02:44:43 PM »
*Originally Posted by KildareMan [+]
You will need the spring compressor and the fork thing to hold the spring and cup washer clear of the nut - for which you need a 16mm spanner.  Bought mine as a kit.  Not expensive.  Also came with an extension piece for the damper rod making it easier to exercise the damper rod when emptying and filling.

KildereMan, great, do you think you could point me to where you got this kit?

Offline grizzlybear

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Re: Changing Fork Oil without Special Tools?
« Reply #3 on: February 02, 2018, 03:27:32 PM »
Cant you turn them upside down to drain oil :084:

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Online Rtwo

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Re: Changing Fork Oil without Special Tools?
« Reply #4 on: February 02, 2018, 03:35:50 PM »
I've done mine without any special tools.
The only thing a bit different was I used a length of fishing line to hold the cup washer out of the way whilst setting the nut.
It was an improvisation though and I'd be happier with the clip tool


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Offline KildareMan

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Re: Changing Fork Oil without Special Tools?
« Reply #5 on: February 02, 2018, 04:41:09 PM »
*Originally Posted by grizzlybear [+]
Cant you turn them upside down to drain oil :084:

Yes but best to remove the fork cap from the damper rod first other wise oil goes in all directions.
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Offline Harsh

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Re: Changing Fork Oil without Special Tools?
« Reply #6 on: February 02, 2018, 05:47:13 PM »
*Originally Posted by KildareMan [+]
Yes but best to remove the fork cap from the damper rod first other wise oil goes in all directions.

Plus to set the air gap correctly the spring has to be removed.

You get this kit from Traxxion Dynamics http://traxxion.com/product/fork-service-tool-kit/  You can also buy the parts individually.  Just search their site for fork spring compressor.  I am sure there is probably something similar on your side of the pond.
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Offline tauzero

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Offline Kris

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Re: Changing Fork Oil without Special Tools?
« Reply #8 on: February 03, 2018, 01:45:10 AM »

Great. Thanks a lot! I will get the whole set, cross my fingers not to mess it up :) So far I changed fork oil only on old style bikes, like Enfields which have very simple forks. 

I think the OEM fork oil has viscosity around 36 at 40C.  I am partial to Motul so think I will use their synthetic 10W which has very similar viscosity.

Offline Kris

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Re: Changing Fork Oil without Special Tools?
« Reply #9 on: February 03, 2018, 02:21:32 AM »
regarding the air gap, if I just take the top nut out (with roadie), and let the oil out without taking the spring out, and refill the same amount that came out, wouldn't it allow to restore the stock settings of the forks?

 


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