Need help with fork and shock spring rates YZ426F

3 replies to this topic
  • Kevinlee70

Posted June 09, 2010 - 09:09 PM


Hello everyone,

I have a 2002 YZ426F and I know the stock spring rates for the forks and shock are .46KG/MM and 5.4KG/MM respectively.

I weigh 215-220 pounds without riding gear and need to get some stiffer springs front and back.

Right now on the rear, i have to crank the pre-load a lot to get my correct race sag. The problem is that i then have zero static sag, the shock is topped right out.

Does anyone know what spring rates i need to get to work with my weight? (Is going to a .48KG/MM in the front and 5.6KG/MM in the rear enough of an increase?)



  • grayracer513

Posted June 10, 2010 - 06:31 AM


Race Tech's spring rate search: http://www.racetech....d=17&menuid=49#

MX-Tech's spring rate generator:

Pay attention to whether the rider weight is wanted with or without riding gear.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • jroon

Posted June 10, 2010 - 12:20 PM


I am 275 without equipment(yes I know, just like a tiny dancer) and I just went to a 6kg spring from race tech on the back, and I love it. My bike actually steers now, I take almost all the compression out of it for the woods and it seems to be just great. Now, if I could just stop stalling the old beast.......Hope this helps...
PS. Just to show how ludicrous our prices are up here in Canuckland, the yami dealer wanted 280 bucks for a 5.6 kg spring...My racetech cost 120....Geez...


  • crf450319

Posted June 11, 2010 - 04:57 PM


I just ordered new springs front & back from DSP today, $170 US shipped. Anyway I'm 215 without gear and they suggested a .50 fork spring(s) and a 5.9 kg rear spring.

Race Tech's calculator was the same on the fork springs, but way off according the the tech I spoke with at DSP as RT suggested a 5.6 kg spring.

:thumbsup: - my 4 year old wanted to paste that one.

Related Content


Is it worth it? (Cam and High compression piston) by macgi77

Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies

2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies

Megabomb Fitment by 288yz450

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 1 reply
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

Yamaha YZ450F 2017 by Chris.GVS

Yamaha YZ450F 2017
  • * * * * *
  • 1 review
  • Last review by Tommyk_55
  • On January 15, 2017

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.