HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
Stealth13

2009 suspension help

2 posts in this topic

How do I make the suspension stiffer on my 450? I was going off some little 2 foot jumps and it bottomed out every time :(

It is bone stock right now, no mods

Share this post


Link to post
Share on other sites

WR's are notoriously soft

The fork springs are quoted by Yamaha as 0.46kg/mm but my 2008 actually measured 0.41kg/mm

Further more, the fork compression base valves are unique and manage to make the bike feel harsh over tree roots, yet allow the forks to blow through the stroke and bottom out on small jump landings (as you have discovered)

The forks need to be re-sprung with decent aftermarket springs to suit your weight

I am 210lbs and now use proper 0.46kg/mm springs

The damping is easily sorted with Race Tech Gold valves - no amount of fork oil weight, oil level or clicker adjustment will make the forks behove properly

Have a read of this http://www.thumpertalk.com/forum/showthread.php?t=776751 and this http://www.thumpertalk.com/forum/showthread.php?t=740400

the rear is also undersprung, but fortunately the shock is basically good and can cope with stiffer springs

You need to check your sag figures and re-spring if you can't get the 25mm/100mm sag figures

I am running a 6.0kg/mm spring

If you go stiffer on the spring you will need more rebound damping to control it, but adding more rebound also adds compression damping due to the design of the shock damping circuits, so just bear this in mind

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0