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Old 12-17-2014, 03:42 PM   #1
Monkeyclaw OP
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Location: Sedona
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Setting up sag on lowered KTM 350 EXC-F

I recently purchased a lightly used 350 EXC-F that has the race tech lowering bushings in the shock and forks. I'm trying to set up the sag on it, but I don't know how the lowering kit affects the sag and suspension set up. As far as I can tell, everything is stock (rear spring is 69 N/mm). Normally, this would be too stiff a spring for me @ ~66Kg but I'd like to set up the sag as well as possible with this set-up before I go buying anything.

Should I just set everything up according to the owner's manual? Or do the bushings change the amount of static and rider sag?

Thanks!
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Old 12-17-2014, 06:28 PM   #2
michael1968
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I believe the general rule is to set the sag at around 1/3 of suspension travel, a non-lowered dirt bike will usually have 300mm travel and ~100mm sag (plus minus a bit depending on a number of factors).
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Old 12-18-2014, 07:41 AM   #3
Monkeyclaw OP
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Cool, thanks!
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Old 12-18-2014, 07:48 AM   #4
YamaLink
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A linkage bike requires approximately 1/3 sag. A bike that was lowered internally doesn't change the leverage as much as one with a KTM lowering link which is sometimes helpful when the rider is too light for the stock spring. Internal shortening often requires revalving because the stock valving and spring can make the suspension ride more harsh in its stroke when spacers are added.

First thing's first: set your sag and see where it's at.
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Old 12-18-2014, 05:11 PM   #5
Monkeyclaw OP
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Quote:
Originally Posted by YamaLink View Post
A linkage bike requires approximately 1/3 sag. A bike that was lowered internally doesn't change the leverage as much as one with a KTM lowering link which is sometimes helpful when the rider is too light for the stock spring. Internal shortening often requires revalving because the stock valving and spring can make the suspension ride more harsh in its stroke when spacers are added.

First thing's first: set your sag and see where it's at.
Thanks for the info. I also sent an e-mail to Race Tech and they replied with pretty much the same thing. Aim for 1/3 of the travel and the stiffer spring may be OK because it is required due to the lower amount of travel.

Next questions...

1) How do I determine the current travel?
2) Should I determine static sag also? Or just rider sag? Seems like the info in the manual regarding recommended static and rider sag won't be useful (though I could run some quick numbers to get a proportion of my current travel).

Thanks for the help with this!
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Old 12-18-2014, 05:36 PM   #6
el capitan
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With a DR or similar simple fork Id say just remove the springs and measure the travel - you at least end up with a rough image of likely travel. For the fork you can just measure the free chrome-part of the forkleg, for the shock there is no such simple way.

In general you should try to be symmetrical front and rear. Putting your weight on the bike in the position the bike will be ridden both ends should dive approximately the same amount. It still might be too harsh or too soft, but this is still better than having a soft and a stiff wheel, no matter which is where.
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