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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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  #1  
Old 19th May 2022
Mathias Mathias is offline
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Default Fork Maintenance

Hi
Was a about to do fork maintenance
I Alrdy got some ipone fork oil 20
But I don’t know if my spring are stock or not and maybe 20 oil gona be to hard then

So if you guys have any clue there is it



Thx
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  #2  
Old 20th May 2022
IXL2Relax's Avatar
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Default

Here's the Sportsterpedia page on Front Forks:
http://sportsterpedia.com/doku.php/techtalk:evo:susp01

Those are Dual-Rate Springs - You can see the difference in coil spacing.

I believe all the HD OEM Fork Springs thru 2003 were single-rate springs,
although the part numbers changed in 1997 - so I'm not sure.

Those may be Progressive brand springs or some other aftermarket brand.
Did you have a preload spacer at the top?

Here's my thread about installing Progressive springs:
http://xlforum.net/forums/showthread.php?t=2006111


Here are two Sportsterpedia links regarding Fork Oil. I suspect 20# is too thick unless you're carrying higher than normal weight. Also remember that the front & rear shocks do interplay with each other - so sometimes, what appears to be a front suspension issue, may actually be happening because of a rear suspension problem.

Fork Oil - stock:
http://sportsterpedia.com/doku.php/techtalk:evo:susp04

Fork Oil - more:
http://sportsterpedia.com/doku.php/techtalk:ref:susp01


More suspension reading:
http://sportsterpedia.com/doku.php/techtalk:ref:susp06
http://sportsterpedia.com/doku.php/techtalk:ref:susp07


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  #3  
Old 20th May 2022
Mathias Mathias is offline
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Default

No preload
I’m pretty lost now someone on French forum said stock 😅
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Old 20th May 2022
Mathias Mathias is offline
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Default

so anyone ? They look like Progressive but no preload
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Old 20th May 2022
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Default

This link to the 45376-97 part shows a Dual-Rate wound spring:
https://estore.chester-harley-davids...ng-p71744.html

And this thread shows old & new springs - And both versions are Dual-Rate wound.
http://xlforum.net/forums/showthread.php?t=436424

Therefore, I would think you have STOCK SPRINGS. They seem to be full length at 20.75" long.


What was the point of identifying the springs (other than curiosity)? Are you putting them back in? Replacing them?

Was there a problem with the front suspension?

Be sure to go thru setting the sag (adding preload if needed).

Have you upgraded or changed the rear shocks?

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Last edited by IXL2Relax; 20th May 2022 at 23:42..
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  #6  
Old 20th May 2022
Mathias Mathias is offline
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Default

rear are progressive 412


Just wanted to be sure because ppl say 20w oil i'ts only good to help if you have stock springs


so if they are stock im good with my 20w oil if they not need some 15w
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