Question about springs

6 replies to this topic
  • waltersobchak

Posted November 14, 2015 - 03:35 PM


I used the race tech calculator to see what it recommended for springs for my weight.

Stock fork sprigs are .47, RT recommends a .468

Stock Shock spring is 5.7, RT recommends a 6.0

I entered a body weight of 205, 30-44 years old, intermediate trail/enduro rider, standard height, oversize fuel tank.

Just looking for a second opinion on the fork springs. Based off the RT calculator they should be good. I'm just not understanding why the shock is that far off and the fork is almost perfect.

Edited by waltersobchak, November 14, 2015 - 03:50 PM.

  • Monk

Posted November 14, 2015 - 04:25 PM


What bike?

Edited by Monk, November 14, 2015 - 04:25 PM.

  • waltersobchak

Posted November 14, 2015 - 04:39 PM


What bike?

2013 yz450

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

Posted November 14, 2015 - 07:32 PM


Try the Factory Connections calculator

I put in my riding weight, fully geared up and I get a higher spring rate, which after setting the sag, proves to be and turns out to be more appropritate

  • waltersobchak

Posted November 16, 2015 - 05:42 PM


Factory Connection doesn't have an online spring rate calculator, so I sent an email and asked what they would recommend. Here is their reply
Thanks for the e-mail.

        I would agree with the STD .47kg fork springs.

Shock Spring we'd use 6.1kg     We do not make a 6.0kg  I think the 6.1kg is
perfect for you.

Rider Sag 106mm is what we recommend.

Part # ALS-0061   - Shock Spring, FC 6.1kg $119.95

  • jcross312

Posted November 17, 2015 - 05:18 AM


I called FC yesterday for spring recommendations, (2016 yz450,weight 195, motocross) they told me that stock fork springs are fine .51 and I need to go stiffer on shock spring to 6.0, stock is 5.7. I didnt ask them, but wonder why yamaha would make a bike with an unbalanced suspension?

  • waltersobchak

Posted November 22, 2015 - 12:01 PM


Bought the 6.1 from Factory Connection. Went for a ride Saturday and pretty happy with it. Bike was good before, but is just generally better all around now. Lot more confidence in the bike now.

Related Content


yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F

Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 replies
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies

Should I buy this bike? help....... by Numsa Hul

Dirt Bike   General Dirt Bike Forums   What bike should I buy?
  • * * * * *
  • 10 replies

BIGBORE FOR YZ450F 2006? by Taattie94

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 1 reply

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.