any other small riders on a 450


10 replies to this topic
  • stealman

Posted November 18, 2009 - 08:23 PM

#1

I just got a 08 yz450 and am trying to figure out what suspension springs are right for my weight. I weigh 145lbs and with gear on 170lbs. I am 5'6" tall. The mx-teck spring generator recommends 4.3 for the for and 5.3 for the shock. I posted this in the suspension forum and people say these are too light. But I seem to be having trouble getting anyone to suggest a rate. Or why they think think mx-tech is wrong.

I would like to hear from other small rider and what works.

Edited by stealman, November 18, 2009 - 08:34 PM.
change info


  • rmcr250r

Posted November 18, 2009 - 08:49 PM

#2

i have an 09 yz450 im 5'7'' and with gear im about 175lbs i use the stock settings and everything is pretty much perfect for me

  • grayracer513

Posted November 18, 2009 - 09:11 PM

#3

Race Tech recommends .44 and 5.15.

Give Dave Johnson a call at SMART Performance and see what he says.

  • YamaLink

Posted November 18, 2009 - 10:03 PM

#4

I'm 170 before gear and the rear spring is spot on for me; I also added an aftermarket connecting rod, and took out 5cc of oil in each fork leg.

  • Curt_704

Posted November 19, 2009 - 04:37 PM

#5

155 without gear, 5'6" tall. I softened the suspension a little. .45 forks springs with a 5.3 shock spring and it handles better for me.

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  • stealman

Posted November 19, 2009 - 07:32 PM

#6

155 without gear, 5'6" tall. I softened the suspension a little. .45 forks springs with a 5.3 shock spring and it handles better for me.


What race sag and free sag measurement do you have?

  • osheen

Posted November 19, 2009 - 09:49 PM

#7

I'm 5'7", 165 lbs in street clothes. Vet Expert MX rider. 08 YZ450. I run .44 ft and 5.3 rear. I prefer my suspension on the soft side and I'm completely happy with how my bike works. I can't remember how much oil I put in the forks but I know it was the minimum of what is recommended in manual. I run about 95mm race sag. Free sag is about 28-30mm. I'd probably consider trying a 5.2 spring if I had one laying around.

I'd say that MX Tech and Race Tech spring generators are ballpark for real world riders...... Those other guys are probably over 200lbs. Don't pay any attention to what they say. They aren't the ones riding it. One thing I've mentioned on here before is that your stock springs may be far off from what they are supposed to be. My oem fork spings measured out to be .49 kg/mm !!! Yikes!!

  • Family Man

Posted November 19, 2009 - 10:00 PM

#8

The speed and style of the rider is also important as faster more aggressive riders tend to like the bike stiffer than slower riders of the same weight. Not always the case though...

  • Curt_704

Posted November 22, 2009 - 07:00 AM

#9

Stealman - My race sag is set at 3 3/4" which results in a static sag of 1 3/8".

  • stealman

Posted November 22, 2009 - 07:29 AM

#10

Stealman - My race sag is set at 3 3/4" which results in a static sag of 1 3/8".


Thanks with that info it looks like the racetech and mx tech calculators are very close. 5.1 or 5.2.

  • grayracer513

Posted November 22, 2009 - 08:27 AM

#11

My race sag is set at 3 3/4" which results in a static sag of 1 3/8".

Your rear spring is a little too stiff. A 4" race sag should give you a 1" static:

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





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