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Sportster Motorcycle Suspension, Frame, Forks, Handlebars, Fuel Tank, Oil Tank, Fenders Discuss Sportster Motorcycle Suspension, Frame, Forks, Handlebars, Fuel Tank, Oil Tank, Fenders problems, advice, and/or how tos.

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View Poll Results: What weight fork oil do you use
5w 37 9.27%
10w 85 21.30%
15w 110 27.57%
20w 38 9.52%
30w 15 3.76%
standard weight HD 73 18.30%
Screamin eagle HD 51 12.78%
Multiple Choice Poll. Voters: 399. You may not vote on this poll

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  #111  
Old 5th April 2019
Four Speed Four Speed is offline
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I use Silkolene RSF pro 2.5 with Ricors Intimidators. I didn't get on with the recommended Amsoil low Viscosity Index (VI) fork oil
as the forks were way over damped in cold weather. Ran some viscosity/temp simulations on the web with a utility and chose the Sikolene
which had same Cst at 40c as the Amsoil but double the Viscosity Index(!). The damping works so much more consistently in all temperatures,
particularly mid-stroke compliance and braking that you barely notice it working

This may help:
http://www.peterverdone.com/wiki/?ti...spension_Fluid
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  #112  
Old 7th April 2019
jazzman jazzman is offline
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I've just changed the oil on my new to me 2005 883. 20000km from new. oil was a green colour, not too dirty. I put in 10w castrol at 320ml per fork. It seems a little better on our shit country Aus roads.
Regards the springs, they are wound in three sections, top 3/8 inch between coils, middle 3/16, and last 1/8. Are these stock?
And a big thanks to this site and previous posters who said to put a sharpie line where the threads start on the top cap. I'd've been dicking around for ages! and to loosen the top pinch bolt, I forgot on 2nd fork for a minute- couldn't turn it off! Haha!
It's a weird torque setting on the top cap 22-58 lb/ft ???
I set it at 30. Whats the deal here?
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  #113  
Old 1 Week Ago
60Gunner's Avatar
60Gunner 60Gunner is offline
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Quote:
Originally Posted by Four Speed View Post
I use Silkolene RSF pro 2.5 with Ricors Intimidators. I didn't get on with the recommended Amsoil low Viscosity Index (VI) fork oil
as the forks were way over damped in cold weather. Ran some viscosity/temp simulations on the web with a utility and chose the Sikolene
which had same Cst at 40c as the Amsoil but double the Viscosity Index(!). The damping works so much more consistently in all temperatures,
particularly mid-stroke compliance and braking that you barely notice it working

This may help:
http://www.peterverdone.com/wiki/?ti...spension_Fluid
That's interesting. I'm running the recommended 5w with the Intiminators. Vast improvement over the stock that's for sure.
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  #114  
Old 1 Week Ago
Four Speed Four Speed is offline
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The Ricors do improve the damping considerably but the amsoil 5W fork oil they recommend has a low viscosity index
compared to other syn fork oils. I found it too viscous at lower temperatures making the damping ramp up way too much.
The Silkolene RSF I use now which has more than double the VI and works much more consistently. By just 10 centigrade the
amsoil would have thickened to twice twice the viscosity of the Silkolene and that is not a subtle difference in the damping. The
Silkolene flows better when cool and retains its viscosity better at higher temperatures as well. What not to like! Shanneba and I
did some detailed exchanges on this. Warning Geek content.
http://xlforum.net/forums/showthread...ht=Centistroke
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  #115  
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I'd probably experiment some but I don't ride when it's cold enough to really matter so I'm not going thru the process.
Good info tho. Thanks.
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  #116  
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I changed mine recently which had only 10K miles on it but it is a 2005 model, so I figured it probably needed it. I'm glad I did. The forks would bottom out on little bumps and when I changed it, it stunk like a long-dead skunk and looked like very old black coffee. There was approximately 10 oz. in each when I drained them, so that is what I put back in.
I used HD Type E Hydraulic Fork Oil – AMSOIL SHOCK THERAPY Suspension Fluid #10 Medium. I don't know what the weight is but it meets H-D's specs so that is good enough for me.
I found out that the fork oil definitely needed changing because my first ride with the new oil was fantastic. No more bottoming out and I had a much smoother ride over the bumps. The damping was indescribable.
I'm not advocating the brand that I used, just that the H-D Type E stuff works and should probably be changed at 10K mile intervals or more frequently, depending on the time the bike sits. I figure the old oil was probably bad for the fork seals as well, especially since it was so thin after it broke down.
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  #117  
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According to BelRay: HD fork oil type B = 25w, HD type E = 20w. I, personally, wouldn't use anything less than 15w. It's easier on seals then heavier fork oils, although, I feel, it wears out faster. {things to know: The "W" in oil labels, such as 10W40, stands for "winter" not "weight". Oil is like a 10 in winter and 40 in summer.}
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