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Old 08-11-2012, 11:16 AM   #76
slackmeyer
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Quote:
Originally Posted by Hodgo View Post
Forget that.. the 640 ADV is 70 / 260 as opposed to 140/215 on the SE.

But in laymans terms.. whats the difference ?

Anyone ?
Not sure exactly what you're asking. . . . but the first number is the spring rate (7.0 kg/mm vs. 14.0 kg/mm), the second number is uncompressed length in mm. The spring rates are so different because the 640 has a linkage rear suspension, the SE does not.
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Old 08-11-2012, 02:29 PM   #77
Hodgo
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Thanks Slacks... Thats exactly what I was wanting to know. Explains why such a big difference in rates.
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Old 07-23-2013, 06:13 PM   #78
trent74
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Hey everyone,

Great thread!

I bought a SE last summer that was well setup except stock suspension. It has the Safari tank and FMF pipes with a BDCW rack and side bag mounts that work with the KTM soft bags. I weigh 185lbs without gear lower A-level dirt rider (have 2011 KTM 250XC currently) and decent track-day experience. The stock suepension felt like I was riding a plank so I had my local dealer (Carl's Cycle) (who does good valving work) revalve and ended up going to .7kg fork springs and got a custom Cannon Racecraft 9.5-11.5 Progressive spring (they build to order with specs given with about a two-week turnaround).

The front feels good and I don't dive under braking or bottom (running 1/2 turn preload). The rear is a little soft for my fully-loaded weight of probably 220. For normal riding feels pretty good but want to balance the bike better front/rear. I am currently running 12-13mm preload with static/rider sags of 46mm and 86mm without gear.

I measured without gear on a buddy's SE with an 11-13kg spring and got 39/80 at 9mm of preload (6 turns). I think I will be 45/87 with one less turn of preload (7mm) and with an 11.5-13.5 I should get 35/76 at 9mm and 40/83 at 7mm. Any thoughts between these rates? I did try a straight rate 11.5kg spring for a ride and it still felt harsh so I am leaning towards the 11-13kg. Any reason to run less than 8mm preload when using a progressive spring to keep higher in the plusher initial stroke? If any one is interested I will have my less than 1000 mile 9.5-11.5kg spring for sale in the coming weeks as well.

Thanks,

Trent
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