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I followed the advice from Progressive and put 20 wt oil in my forks this weekend when I put Progressive fork springs in my 1983 Interstate. Overall the ride is way better. But, now the front end feels a bit overdamped . It feels ever so slightly bouncy in the front like the forks can't react quick enough to small bumps. Has anyone had a similar experience? Did going to a lighter weight oil help?
 

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Frank Ferris wrote:
I thought Progressive suggested 10W, ie lighter and not heavier than the stock 15W.
The info I got with my forks suggested 20wt.
 

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http://www.progressivesuspension.com/pdfs/forkSprings/3055.pdf



[align=left]2. Use the recommended fork oil viscosity as noted in your owners[/align]
[align=left]manual with the following exceptions: GL1100 20 weight,[/align]
[align=left]GL1200/1500 15 weight required. See fine tuning for more information.[/align]
[align=left][/align]
[align=left]If your manual specifies an oil[/align]
[align=left]level higher than 5.5"[/align]
[align=left](140mm) set the oil level[/align]
[align=left]at 5.5" (140mm).
(Oil[/align]
[align=left]level is the distance[/align]
[align=left]from the top of the[/align]
[align=left]fork tube to the top of[/align]
[align=left]the oil with the fork[/align]
[align=left]completely collapsed[/align]
[align=left]and the fork spring removed[/align]
[align=left]see figure 1.)[/align]
[align=left]This measurement can[/align]
[align=left]be made by using either[/align]
[align=left]one of the[/align]
[align=left]Progressive Suspension[/align]
[align=left]Fork Oil Level[/align]

[align=left][/align]
[align=left]Fine Tuning
Pre-load: Spacer length can be decreased to lower the ride height and
soften the ride or increased to raise the ride height and stiffen the
ride. Adjust in 1/4" increments.
Fork Oil: Unless otherwise noted we recommend the stock oil viscosity
and level. Oil viscosity can be changed to alter damping. Heavier
oil to increase damping. Lighter oil to decrease damping. Increase
5 weight increments (i.e. from 10 weight to 15 weight.) Oil viscosity
will have more effect on rebound damping than compression damping,
too high a viscosity can create harshness on sharp edge bumps.
The oil level also affects the ride, too high an oil level and the forks
will feel too stiff, too low an oil height and the bike will bottom and
feel soft or dive.
Air pressure: Progressive fork springs are desgned to be used with no
air pressure under normal conditions. A few pounds of air can make
difference, so add air in small increments.[/align]
 
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