99 YZ400F Fork air bleed


6 replies to this topic
  • RasmusDK

Posted November 13, 2011 - 02:38 PM

#1

Lately i think my fork has gone stiffer then what it use to be, but mostly when i land after a jump, straight out it seems ok. The only other time i had the same feeling is once i pumped my old VFR fork too hard and did a wheelie, so iam wondering if there over time will build up a pressure inside the fork, and therefor its weird.. ?
Well as far as i can read there should be no air pressure inside the fork legs and the air bleed screw is the once at the top, thats not in the center, correct? how often should the be bleed, if they should? Of course it depends of the use, iam thinking rule of thump :busted:

Thanks in advance!

  • RiderX

Posted November 13, 2011 - 11:02 PM

#2

I always pump my forks a few times before I ride and then bleed the air ( I have push-button bleeders). Yes they are the ones at the top (or near the perimeter of the cap), not the one in the center, which is the compression adjuster.

  • niles

Posted November 13, 2011 - 11:42 PM

#3

Just make sure you bleed them cold (before riding).

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  • grayracer513

Posted November 14, 2011 - 07:53 AM

#4

I always pump my forks a few times before I ride and then bleed the air ( I have push-button bleeders). Yes they are the ones at the top (or near the perimeter of the cap), not the one in the center, which is the compression adjuster.

The adjuster on the top of YZ/YZF forks prior to '05 is the rebound adjuster, not the compression.

  • RiderX

Posted November 14, 2011 - 10:34 AM

#5

The adjuster on the top of YZ/YZF forks prior to '05 is the rebound adjuster, not the compression.


I would have bet my left nut that the compression adjuster was on top on my 02. That would have been a bad bet.....

  • grayracer513

Posted November 14, 2011 - 11:45 AM

#6

Yeah, I wouldn't have had any use for it, anyway. :busted:

The '04 and earlier forks were all open bath, or single chamber forks, which means the damper cartridges are inverted relative to the current ('05 and later YZ/YZF) twin chamber forks. This reverses the adjuster positions between the two forks.

  • RasmusDK

Posted November 14, 2011 - 03:28 PM

#7

Damn thought that was compression too :-D

Thanks for helping out! Cheers





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