2006 yz450f fork tube height


4 replies to this topic
  • djtroy

Posted March 09, 2008 - 07:59 PM

#1

I raised my forks up in the triple clamps. I have my forks almost hitting my handelbars. This will help the bike corner but is there any negative effects running the tubes this high up? I never get any headshake at high speed.

  • Kasjok

Posted March 09, 2008 - 09:44 PM

#2

You will loose in high speed stability. In whoops section for example. I think rising tubes to the handlebars is too radical. It will probably have more negative effect on the whole rather then positiv. But try it out and let us know how did you feel.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • grayracer513

Posted March 10, 2008 - 06:30 AM

#3

Raising the fork affects "rake", or head angle. Like most aspects of motorcycle steering geometry, head angle has a double-edged effect on steering, and if you improve one thing you have to give up another.

Bikes built for cornering ability have much steeper head angles than MX/Offroad bikes. The R1 has a rake of 24 degrees, for example, and flat track and Speedway bikes are built with head angles ranging to as steep as 21. The reason for this is that a more vertical head angle has a much lower tendency to understeer, or "push" the front end, in corners.

However, MX bikes don't operate in the neatly manicured world of paved or graded surfaces, and have to have the ability to hit obstructions like whoops, holes, bumps, etc., and track straight over them without the front end wanting tuck one way or other on impact. That requires a shallower head angle in the 26.5 - 27.5 degree range.

Pulling the forks up on your YZF by 5mm probably only changes the head angle by 0.1-0.2 degrees, but small changes can be noticed, especially on an '06 and up model. What you would first loose by doing so is a little stability when hitting bumps at an angle, and your bike may show an increased tendency for the front end to "kick" when you hit rocks, etc. It will, however, push the front less.

  • djtroy

Posted March 11, 2008 - 07:18 AM

#4

Raising the fork affects "rake", or head angle. Like most aspects of motorcycle steering geometry, head angle has a double-edged effect on steering, and if you improve one thing you have to give up another.

Bikes built for cornering ability have much steeper head angles than MX/Offroad bikes. The R1 has a rake of 24 degrees, for example, and flat track and Speedway bikes are built with head angles ranging to as steep as 21. The reason for this is that a more vertical head angle has a much lower tendency to understeer, or "push" the front end, in corners.

However, MX bikes don't operate in the neatly manicured world of paved or graded surfaces, and have to have the ability to hit obstructions like whoops, holes, bumps, etc., and track straight over them without the front end wanting tuck one way or other on impact. That requires a shallower head angle in the 26.5 - 27.5 degree range.

Pulling the forks up on your YZF by 5mm probably only changes the head angle by 0.1-0.2 degrees, but small changes can be noticed, especially on an '06 and up model. What you would first loose by doing so is a little stability when hitting bumps at an angle, and your bike may show an increased tendency for the front end to "kick" when you hit rocks, etc. It will, however, push the front less.



Ive been running them that high for quite some time. The bike still makes me feel like it wants to ride right off the track sometimes. I will be getting the e axle and dropping them back down a little bit and see if these things help. I never get headshake.

  • Kasjok

Posted March 11, 2008 - 08:30 AM

#5

Get on that tank!





Related Content

Forums
Photo

Michigan Motocross Tires by 288yz450


Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply
Forums
Photo

2016 YZ450 by CaptainKnobby


Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies
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
Forums
Photo

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
 
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.