suspension springs transferred from 250f to 450f


7 replies to this topic
  • djo269

Posted July 25, 2005 - 08:29 PM

#1

I have a 2002 yamaha yz250f that I bought aftermarket springs for .52 front and a 6.6 rear. Could I put those springs on a 2003 yz450f?

  • djo269

Posted July 26, 2005 - 10:20 AM

#2

does anyone know for sure on this. i just bought a 2003 yz450f and need to get it set-up soon so i can start getting used to it.

  • grayracer513

Posted July 26, 2005 - 11:10 AM

#3

They will fit. You must be a big dude.

  • fastenuf4u

Posted July 26, 2005 - 11:25 AM

#4

They will fit. You must be a big dude.


Yeah, I agree. I am 220 without gear and I have a .48 front and 6.0 rear and the rear overpowers the front. I need to get a 5.6 like Race Tech's website recommends. Not sure why the suspension guy who installed the springs went with them.

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  • grayracer513

Posted July 26, 2005 - 02:40 PM

#5

Yeah, I agree. I am 220 without gear and I have a .48 front and 6.0 rear and the rear overpowers the front. I need to get a 5.6 like Race Tech's website recommends. Not sure why the suspension guy who installed the springs went with them.


I'm 190 (now and then) without gear. Mine also has .48 fronts, but with a 5.8 rear. The rear is just about right, according to the way the sag sets up, but I've always wondered about the front. I have the stock .46's, maybe I'll try them.

Talk about a hijack. :applause:

  • Lukejt

Posted July 26, 2005 - 03:54 PM

#6

Wow, 185 and a 5.8! I'm 240 and just bought a 5.7, Racetech said 5.74 for trails.

Lukejt

  • grayracer513

Posted July 26, 2005 - 07:19 PM

#7

I went by the procedure laid out in these two articles, and according to that, the rear spring rate is correct for my weight when I'm ready to ride.

Setting Race Sag (Do first)

Using Stait Sag to Check the Spring Rate

I've seen several posts that claim the Race Tech calculator yields excessively light rates. Somebody's wrong.

  • Lukejt

Posted July 27, 2005 - 04:10 AM

#8

Thanks, I got the 5.7 for $20 on Ebay so no big loss, it's a Racetech. I'm going to install it before the weekend and I will set the sag and check the numbers.

Lukejt





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