Heads up! 06(-09?) Fork Base Valve plastic cracks


3 replies to this topic
  • ben_suhard

Posted July 24, 2009 - 07:21 PM

#1

This is just a heads up about the 06(-09?) Kayaba SSS fork base valve plastic chamber. One of mine was cracked, and apparently quite a few other owners have had the same problem. MXA mag consulted Pro Circuit, and they said the simple preventative measure is to drill a small hole in it.
Here's the MXA article http://www.motocross...E802C43DAFDFB23

  • nickeenoo

Posted July 24, 2009 - 07:45 PM

#2

This is just a heads up about the 06(-09?) Kayaba SSS fork base valve plastic chamber. One of mine was cracked, and apparently quite a few other owners have had the same problem. MXA mag consulted Pro Circuit, and they said the simple preventative measure is to drill a small hole in it.
Here's the MXA article http://www.motocross...E802C43DAFDFB23



Nice reminder; this has been an issue for a few years. I believe the 08-09 already have the hole drilled? I'm sure someone else can verify. There is some good info on this issue:

http://smartperforma.../YZMODASSEM.htm

Nate

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

Posted July 24, 2009 - 07:55 PM

#3

Not news, but as said, good reminder.

http://www.thumperta...ad.php?t=650136

http://www.smartperf.../YZMODASSEM.htm

There has been some debate over whether the the problem is truly related to hydro-locking the free piston. Dave Johnson (DaveJ) has seen a couple of pistons break in spite of the fact that they were already drilled, and I don't recall what he has discovered since then.

Regardless, The mod improves overall suspension action by increasing the air volume over the free piston, so that only the ICS spring has a significant influence on the free piston pressure, so it's a good thing to do in any case.

  • ben_suhard

Posted July 24, 2009 - 07:55 PM

#4

I obviously haven't spent enough time on the forum! I might drill a few more holes in mine.





Related Content

Forums
Photo

James Stewart back on a YZ450F by YamaLink


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies
Forums
Photo

Megabomb Fitment by 288yz450


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

2016 YZ450 by CaptainKnobby


Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 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

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.