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  #1  
Old 02-03-2013, 06:41 PM
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Default fork oil question

     

Ok so I have a 2002 cr 250, and I'm goin to replace the fork seals. My question is will 5 weight fork oil work? Or do I have get a different weight?
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Old 02-03-2013, 06:48 PM
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5 is the standard. As far as what kind works best everyone will have an opinion but experience is silkolene makes the best money can buy.
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Old 02-03-2013, 07:11 PM
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Like stated 5w is standard, however it you think your forks were a bit soft then you can always change the fork oil for a heavier/lighter oil. I changed mine and while there is a LOT more to suspension tuning than you think, a simple oil change can make a noticeable difference without changing the valving if you liked your forks before then stick with 5w....

---------- Post added at 11:41 AM ---------- Previous post was at 11:38 AM ----------

With that being said, while your in there you may want to check if the spring rate is correct for your weight....probably the most inexpensive and most important change you can make as a part of correct suspension setup....remember that like the rear, the front need to have a correct 'sag' set by choosing the spring rate to match your weight.
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Old 02-03-2013, 08:02 PM
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But also keep in mind what fresh 5 wt compared to broken down contaminated 5 year old fluid will make for a different/ better feel also.
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Old 02-03-2013, 08:42 PM
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Yes completely true!!! fresh oil is MUCH better!!!
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Old 02-05-2013, 06:55 AM
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Awsome thank a bunch!!
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Old 02-05-2013, 11:09 AM
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everyone that plays with their suspension developes some likes and dislikes. with the great adjustability of suspension units in the last 20 years I have changed my preferences. I like to use a light of an oil as I can (viscosity rating that is). I can get the damping changes i want via the clickers. maybe it is just the sense that it makes that causes me to lean that direction, but you get less damping changes from cold to warm with the lighter oils. then you just let the valving work. if you cant get the damping affect you want with the adjustments or mechanical modifications, then i guess the viscosity rating game comes next. havent needed that since the days of "do you run 30 wt, 20 wt, or automatic transmission fluid?
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Old 02-05-2013, 01:32 PM
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Quote:
Originally Posted by ossagp View Post
but you get less damping changes from cold to warm with the lighter oils.
I believe this to be true as well, I haven't proven it but my understanding is
that if you are using valving setup-to use light weight oil it will create less
heat. Less heat change of your fluid should support the above quote IMHO....
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Old 02-05-2013, 07:05 PM
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With silkolene Pro RSF fluid it stays consistently the same warm or cold. I have proven this by running shocks or forks on the dyno comparing different fluids.
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Old 02-06-2013, 06:06 AM
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Quote:
Originally Posted by bbrmotosports View Post
....I have proven this by running shocks or forks on the dyno comparing different fluids.
I, for one, would love to see the result of your dyno tests.

What oils have you tested and at what temperatures?

Scott
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