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 Fork oil change

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IAmABug




PostSubject: Fork oil change   Mon Sep 30, 2013 5:25 pm

Hey all. I have my bikes front end apart and would like to change the fork oil. What weight oil and any thoughts on proper procedure to do this. Thanks. I am 5'6" 140lbs.
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pbnut

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PostSubject: Re: Fork oil change   Mon Sep 30, 2013 10:22 pm

I just did this with my R6. The simplest method is to pour the oil out into a graduated cylinder. In doing so you can measure the amount that came out, and then pour in the same amount. My "graduated cylinder" consisted of a water bottle I had cut the top off. The ribs on the bottle made for nice reference points.

I used Maxima 5wt oil for my R6, as this is apparently pretty close to the oil used by Yamaha from the factory.
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johnkol




PostSubject: Re: Fork oil change   Tue Oct 01, 2013 6:37 pm

IAmABug wrote:
Hey all. I have my bikes front end apart and would like to change the fork oil. What weight oil and any thoughts on proper procedure to do this. Thanks. I am 5'6" 140lbs.
Very informative videos; they deal with changing fork seals, but changing fork oil is part of the procedure.
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TexaNate




PostSubject: Re: Fork oil change   Mon Feb 03, 2014 8:45 pm

pbnut wrote:
I just did this with my R6. The simplest method is to pour the oil out into a graduated cylinder. In doing so you can measure the amount that came out, and then pour in the same amount. My "graduated cylinder" consisted of a water bottle I had cut the top off. The ribs on the bottle made for nice reference points.

I used Maxima 5wt oil for my R6, as this is apparently pretty close to the oil used by Yamaha from the factory.

This method may be the simplest but it likely won't yield the kind of precision you want with regards to your oil level. Oil level is a tuning parameter and small changes in it can yield huge differences in suspension performance - small differences between fork legs can be really bad for damping performance. Use a proper oil level tool (such as the Motion Pro) to measure the distance between the top of the compressed tube and the top of the oil, as per shop manual. I believe 5wt is what comes from factory.

Stuff you probably already know - when removing and reinstalling your forks, pay close attention to the order in which fasteners are removed and installed, as well as their torque values - especially for your pinch bolts and the cap. When it's all back together, undo the right side pinch bolts and pump the forks a couple of times to ensure the forks aren't binding.
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rsteiger

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PostSubject: Re: Fork oil change   Mon Feb 03, 2014 8:55 pm

I think the shop manual calls out 105mm on the fork oil level. After reading a few threads here I went with 5W fork oil at 120mm from the top to try and take some of the harshness out.

Definitely an improvement but I can't tell you if it was the oil level or putting in a good quality 5W fork oil that did the trick.
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