spring for yz 450f


6 replies to this topic
  • uncle jeff

Posted December 14, 2007 - 06:22 AM

#1

I have a 05 yz450f that I bought used to ride in the woods. The suspension is killing me. According to my manuel the springs are color coded, my spring is silver but the book doesn't show a silver spring. does any body no the spring rate for the silver spring?

  • Ryan at Eibach

Posted December 14, 2007 - 08:58 AM

#2

I can't answer the color code question, but I can tell you what you should have on there based upon your height, weight, terrain your ride, etc.

  • jayh300

Posted December 14, 2007 - 09:06 AM

#3

if it is the same as mine was..... the color is a painted dot on the spring which i could not see until I had mine off. I cant remember if it was on the top coil or the bottom coil, but it was on there.

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  • grayracer513

Posted December 14, 2007 - 10:15 AM

#4

"J" is right, and so is Ryan. Some years and/or batches of springs were not painted silver (the one on my '03 is bright yellow), but many were, and the code is a spot on the end of the spring. Unless you bough the bike used, the spring is almost certainly a standard 5.3 kg/mm (Yellow), and even if it's used, it's still fairly safe.

BTW, Eibach Springs all have the part number and rate printed on them where you CAN see it. :banghead:

The springs for YZF's are chosen for riders weighing in the range of 165-190 (street clothes). If you are lighter or heavier than that, the suspension can seem harsh. (An excessively light spring forces you to use more compression damping than you should to keep from bottoming.)

Check your spring rate to see if it's right for you by first setting the rear sag, then using the free sag/race sag comparison to see how it looks:

http://www.tootechra...ension_tips.htm
http://www.tootechra...pension Tip.htm

If that tells you that your spring is wrong, or your weight is just out of the standard range, use the spring calculators at either Race Tech:

http://www.racetech..../searchdirt.asp

...or MX-Tech:

http://www.mx-tech.c...pring_generator

... to determine the right one. Note that one asks for weight with gear, and the other without. Also, if the rear spring is wrong, it's a safe bet the fronts are, too.

If your springs seem to be the correct rate as they are, or if you want to change them yourself and fiddle with the suspension, try this:

http://motoman393.th...suspension.html

Having the suspension reworked professionally is an expensive option, but the results can be quite amazing.

  • uncle jeff

Posted December 14, 2007 - 10:52 AM

#5

thanks guys

  • jayh300

Posted December 14, 2007 - 10:53 AM

#6

and... if you go to change the spring, the "cup" that holds the spring on will not come off until you slide the rubber bumper up the shock shaft. I liked to never figured that one out.
and as gray said... mine 99 yz400f was still the oe spring per the service manual. It had atleast 3 owners including me.

  • todds924

Posted December 14, 2007 - 08:44 PM

#7

I have a 05 yz450f that I bought used to ride in the woods. The suspension is killing me. According to my manuel the springs are color coded, my spring is silver but the book doesn't show a silver spring. does any body no the spring rate for the silver spring?


The color code they are talking about is in the form of paint marks on on the bottom of the spring.





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