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Old 10-31-2005, 06:34 PM   #31
AndyB
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Joined: Dec 2004
Location: WestbyGodVirgina
Oddometer: 173
Thumb MXTech Susp. Work=EXCELLENTA'!

on my 02 Adv, had my fork revalved and sprung with 50's & shock no valve work, but new #80 spring($340.oo).
Along with jetting/airbox sidecover/carb mod, is THE best improvemnt one can do to the 640Adv(my opinion).
i ride the big bike pretty agressive('cause ya can't ride slow and pokin on such a big bike, gotta keep all that wieght moving or they tend to fall over and squish ya),in tight woods of WV/O/KY=steep,rocks and big water bars, Yet with a few clicks of comp/rebound on the shock adjustment, ride is smooth on casual cruising back road rides too. i can't imajine riding loaded on a long tour without stiffening things up, esp. if ya wiegh 190lb. or more...... if you're thinking of re vamping your susp., i highly reccomend them. ....AndyB
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Old 11-01-2005, 10:53 AM   #32
Velocibiker
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Joined: May 2003
Location: Las Vegas, NV
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Quote:
Originally Posted by meat popsicle
stock Adv setup is for a 165lb rider so anyone who is north of that and loading gear on should definately beef up the shock and forks.
I've heard this so many times I've just got to ask;

Exactly what do you mean by the above. Are you saying the suspension is only good if you weigh 165lbs?

I know it says in the manual that the factory shock setting is for 75kg.....

BUT...............

it also states that if you weigh more or plan on adding luggage or a passenger, to change the spring preload.


So - That tells me that the factory setting is for 75kg. Not that the spring (properly adjusted) can't or isn't OK for somebody heavier. AFAIK, if you can get the correct sag settings, the spring is fine.

I think your statement (and the others who tout it) is misleading and incorrect. I think a more accurate statement would be that the OE spring is fine if you weigh between XX and XX.

I admit I don't know what the max weight capabilities of the OE spring are. But that would be easy enough to determine if somebody was so inclined. I'm not, I'm happy with it the way it is (stock - properly adjusted). I bet WP might even know that already.

Anyway.....

Sorry about the (semi) rant, I've just wanted to make this point for a while.....

Nothin' personal. Just happened to be you (this time) Meat
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Old 11-01-2005, 11:21 AM   #33
meat popsicle
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Location: Circumlocution Office of Little Dorrit
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Quote:
Originally Posted by Velocibiker
Nothin' personal. Just happened to be you (this time) Meat
No problem here velo; you got all your ducks in a row. Very reasonable detail to the story you are adding.

I just might add that rider preference for suspension response might figure into the mix of which spring for a given rider weight (with gear) and, as you point out, the recommended sag measurements.
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Old 11-02-2005, 03:39 AM   #34
BSTARD
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Even I'm confused and I know how to do this!

As a rule on an mx bike your race sag (you on bike) should be approx 1/3 of your suspension travel i.e. suspension travel = 300mm, race sag = 100mm.
This allows your suspension to work within design parameters and is important to the way the bike handles.

Due to the dual sport nature of my bike I run 1/4 of suspension travel which is about 75mm. This is not law as some people like it soft in the rear and some folks like it hard so there is room to accommodate personal wants and needs. If you weigh more than your springs rating or you constantly carry a passenger or luggage I would suggest getting a heavier spring or increase the spring pre-load. If you shorten the spring(turn collar nut clockwise) you increase pre-load.

4 the metrically challenged 1stone = 6.5kg, 1in = 25.4mm

Hope this helps.

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Old 11-02-2005, 07:44 AM   #35
meat popsicle
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Merge

Some additional info and links (one circular reference).
http://www.advrider.com/forums/showthread.php?t=102826

especially this one on SAG settings:
http://www.advrider.com/forums/showthread.php?t=11867
do not follow in Cat0020's footsteps

More?
http://www.advrider.com/forums/showthread.php?t=48942
couple in the index already (including one more on SAG)
please give me any links

Mas:
http://www.advrider.com/forums/showthread.php?t=80099
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meat popsicle screwed with this post 11-02-2005 at 08:03 AM
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Old 11-20-2007, 06:14 PM   #36
overlandr
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Joined: Nov 2003
Location: Sydney
Oddometer: 5,790
Quote:
Originally Posted by Buckster
I now have an 80/250 sat here waiting to go on.
Hey Buckster, how did you go with that 80/250mm spring of yours? Does it bottom out or are there any other dramas/limitations using a spring 10mm shorter than the specc'd one? Less sag adjustment for luggage I suppose? Don't you just love waking up these old threads?
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Old 10-24-2011, 04:54 PM   #37
Mifune
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Joined: Oct 2009
Location: Berkeley, CA
Oddometer: 493
Springs that fit the 640 Adventure

After reading through a lot of part lists and catalogues, I believe the following springs to be alternatives, all of which are 43mm x 485mm for WP 48mm forks, that will fit a 2003 - 2007 640 Adventure:

Part No. Description Original Application(s) Notes/exceptions
91410006S 4.4N/mm 640 Adv (2003 - 2004)

91410019S 4.6N/mm 640 Adv (2005 - 2007)
990R Adv (2007 - 2010)

91410020S 4.8N/mm 990R Adv (2007 - 2010)
950 Adv (2003 - 2004)

91410021S 5.0N/mm 690R (2009 - 2011)
990R Adv (2007 - 2010)
950S Adv (2003 - 2004)

91410010S 5.2N/mm 690R (2009 - 2011)

91410065S 5.4N/mm 690R (2009 - 2011) 465mm length

I'm sure there are others and it would be useful if we could keep a list of substitutions people have used with success and others we've had trouble with.

-Stuart
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