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Old 28 Sep 2006
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Question Re-springing a 640 Adv

I have read a few peoples experience with re-springing. Im looking to buy a new 06 Adventure and would like to get the suspension worked out for a cape York Trip next dry season. I weight 100kg + 40-50kg of gear + fuel what would a good spring rate be? Would a re-valve also be necessary?

Also what would a recomeded brand of springs be? Im not sure whats available here in OZ or would I have to order from OS?

Thanks In advance

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Old 28 Sep 2006
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There is a good discussion on this issue on Adv Rider. Follow the link to Section 5, which discusses suspension set-up on the 640 Adv.

Personally I would be inclined to leave the stock springs, as they are more than adequate for your job, but that is just personal preference.

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Old 30 Sep 2006
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Send the whole lot to Precision Concepts Racing in Cali. You'll be amazed.
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Old 7 Oct 2006
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Originally Posted by grimmboy
Send the whole lot to Precision Concepts Racing in Cali. You'll be amazed.
With Freight to the US that's going to cost a bomb!
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Old 10 Oct 2006
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Does the '06 come with the adjustable preload caps on the fork. If not you could buy them to increase the preload for running fully loaded and to get the sag numbers a little better, also you can just add shims inside the caps to do the same. Really it is simple.

If you are short legged like I am you could shorten the springs which will automatically stiffen them and lower the bike at the same time but then you need to put a limiter internally. Again this is not real complex, a good shop can help you or do it yourself. Changing the preload is explained in the WP manual for front suspenion that comes with the bike. If you decide to shorten the fork, use a lowering link on the rear shock.

I have done all this to my '02 640 adventure and it does not wreck the handling like some say, in fact on gravel you will fly especially if you add a Scotts steering stabilizer. That is a must in my book anyway. I stuck about a thousand dollars in my suspension but I lowered the bike 4 inches, got the caps and the steering stabilizer and had the front forks revalved.

If you e-mail Sommer KTM in Austria they will tell you what to do to make the bike right. They are supporting a large number of riders all around the world. I am on the Adventure rider forum as bmwktmbill. If you post there you will also get plenty of advice.

Once you get the bike load it up with gas and gear and set the sag front and rear. Ride the bike and try it. Don't take someone else's advice. The front end moves quite a bit even when shortened but if it isn't bottoming it is working right. Try it first you might like it.
My 2 cents.
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