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Old 12-26-2006, 06:18 PM   #2
creeper
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Joined: Dec 2003
Location: Puget Sound
Oddometer: 10,718
Quote:
Originally Posted by Zerodog
Here is the mods I came up with for my 03 640A. The problems it had were, a harsh ride on dirtroad washboard without subtanks and very open compression clickers. But even though it was too harsh on small stuff the fork was very divey on downhills and braking. The plan was a beefed midvalve and lighter 2 stage basevalve. The idea was to keep it high in the stroke but suck up small bumps like gravel and washboard easy.

On this list I use 1 instead of .1 and 1.5 instead of .15 for the thickness
This is for use in a graph I am working on. If I get it worked out it will be cool to help visualize valve stacks.

Stock 640 Adventure Fork

Base Valve
6 24 1
2 20 1
2 18 1
16 1.5
14 1.5
10 3
18 2.5

Midvalve
4 24 1
22 1
20 1
18 1

.7 stack
1.8 float

Rebound
5 Delta24 1
20 1
18 1
16 1
14 1
10 3
16 3

100mm oil height ?wt from previous owner



Mods 12/24/06

Base Valve

2 24 1
12 1
24 1
22 1
20 1
18 1
16 1
14 1
12 1
10 3

Midvalve
3 24 1
22 1
18 1
14 1
10 1
12 1
14 1
20 1.5
2 10 2

1.45stack
1.13float

Rebound
4 Delta24 1
20 1
18 1
16 1
14 1.5
10 3
16 3

100mm Oil height 5wt oil


So what did it do?

On my initial test riding around town. (No Offroad yet) It seems to be better on square edge bumps like manhole covers and pot holes. Before these were jarring to say the least. The subtanks made this kind of hit better but then it is too soft for me on the street. With the heavier midvalve it does ride higher in the stroke. There is a lot less brake dive. I have to really stab the brake to get it to really dive hard. But it still has 4-5 inches left. With the old valving I could almost bottom it. On dips between streets and into parking lots the fork Gs out a lot less too. I went to a school that has a series of speed bumps. It felt good but nothing surprising. I was mostly impressed with my curb test. (Driving straight into a 6inch curb like it isn't there.) First 10mph. The fork moves and sucks it up nicely. No harshness. 20 mph. Even better. I didn't even lean back. It just sucked it up. I think the curb would have popped my tire with my old setup. It just feels very progressive. All testing today was done with the tanks off. I can't wait to get it on dirt. This weekend will be the test. Desert Whoops here I come!
Interesting stuff Rob... looking forward to a more complete review of your impressions, when you get the chance.

Something that might be of value to others is your weight, approximate riding ability level or terrain/speeds you encounter, fork spring weight and approximate shock set-up... as a point of reference.

That "curb test" thing you speak of... you must video tape that.

C
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