Re-valve of the front forks -03 YZ450F


4 replies to this topic
  • mx27

Posted June 07, 2007 - 06:17 PM

#1

I have a big problem with the front forks of my YZ450F. I have a set of Race-Tech gold valves and installed them but did not do anything to the mid-valve assy. What the problem is the bike's forks are way to harsh in the first 6 -7" of travel. I called Race-Tech and they told me to change the mid-valve to a check valve and it would fix the problem. Not so! I put the forks back together and then had no damping whatsoever! I have tried to put the mid-valve back in and the forks no have damping but they are harsh and unrideable. I have .44 springs installed as I only weigh 160#. Anyone have any suggestions??????? Race-Tech is not much help on this ---- they say it should work. The upside down forks have never worked as well as the ones on my 84 Maico!:thumbsup:

  • Ga450owner

Posted June 07, 2007 - 06:29 PM

#2

I have a big problem with the front forks of my YZ450F. I have a set of Race-Tech gold valves and installed them but did not do anything to the mid-valve assy. What the problem is the bike's forks are way to harsh in the first 6 -7" of travel. I called Race-Tech and they told me to change the mid-valve to a check valve and it would fix the problem. Not so! I put the forks back together and then had no damping whatsoever! I have tried to put the mid-valve back in and the forks no have damping but they are harsh and unrideable. I have .44 springs installed as I only weigh 160#. Anyone have any suggestions??????? Race-Tech is not much help on this ---- they say it should work. The upside down forks have never worked as well as the ones on my 84 Maico!:thumbsup:


Race tech gold valve sux...period simple. If you want harsh forks add them....if you remove the mid valve correctly it will help but it still is not that great. For your weight it may be ok at best if you are a B or A rider. If you have the valve stack - I suggest you put it back to stock or do as I did - send them to Enzo to get set up right...and get the subtank option. You will be much happier.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • 642MX

Posted June 07, 2007 - 06:36 PM

#3

I have a big problem with the front forks of my YZ450F. I have a set of Race-Tech gold valves and installed them but did not do anything to the mid-valve assy. What the problem is the bike's forks are way to harsh in the first 6 -7" of travel. I called Race-Tech and they told me to change the mid-valve to a check valve and it would fix the problem. Not so! I put the forks back together and then had no damping whatsoever! I have tried to put the mid-valve back in and the forks no have damping but they are harsh and unrideable. I have .44 springs installed as I only weigh 160#. Anyone have any suggestions??????? Race-Tech is not much help on this ---- they say it should work. The upside down forks have never worked as well as the ones on my 84 Maico!:)


The gold valves are worthless. Put your forks in a box and send them to this guy http://www.smartsuspension.com. He'll get them working good. :thumbsup:

  • grayracer513

Posted June 07, 2007 - 08:31 PM

#4

Something interesting I recently learned about the single chamber KYB's is that the clickers are essentially just bleed off restrictions for the compression and rebound circuits. The intriguing part is that the rebound clicker not only affects the rebound, it controls the bleed off of the mid valve as well. So when you add rebound damping, you add compression resistance to the mid valve at the same time. If your SC forks seem harsh over the small stuff, try backing the rebound off and see what that does for you.

  • Ga450owner

Posted June 08, 2007 - 07:21 AM

#5

Something interesting I recently learned about the single chamber KYB's is that the clickers are essentially just bleed off restrictions for the compression and rebound circuits. The intriguing part is that the rebound clicker not only affects the rebound, it controls the bleed off of the mid valve as well. So when you add rebound damping, you add compression resistance to the mid valve at the same time. If your SC forks seem harsh over the small stuff, try backing the rebound off and see what that does for you.



interesting point Grey ... so if one removes the Midvalve as many did back in those 00-04 days, as I did and thought there was some benefit. This would seem to mess the entire point of the stock settings up. But to your point Enzos recommended settings after they did my 03 would substantiate your info...and of course the oil levels change dramatically with Enzos subtanks....70mm.

Good stuff :thumbsup:





Related Content

Forums
Photo

Megabomb Fitment by 288yz450


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

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


Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 replies
Forums
Photo

YZ450F 03 Sparks driving me crazy by SirAttard


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 5 replies
Reviews

Yamaha YZ450F 2017 by Chris.GVS


Yamaha YZ450F 2017
  • - - - - -
  • 0 reviews
Forums
Photo

Snake pit oct 30th by The Anvil


Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies
 
x

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.