Relieving front fork pressure


14 replies to this topic
  • red7

Posted January 04, 2007 - 11:31 AM

#1

I just picked up my '06 YZ450 from a dealer in Utah and he said I should probably relieve some of the pressure since I'm going from 6000' to sea level. Is this correct? What do I do and how do I do it?
Thanks!

  • Wyatt

Posted January 04, 2007 - 11:47 AM

#2

There is a bleeder screw on top of the forks. Don't get it confused with the adjuster screw that is in the center of the top. Have your bike on a stand and unscrew the bleeder screw with a small flat blade screwdriver. You shoudl hear a hiss as air escapes. Then simply screw it back in.

It is a good idea to do this on riding days also to be sure that you don't build too much pressure in the forks due to heat. It takes a few seconds to do.

  • 642MX

Posted January 04, 2007 - 12:22 PM

#3

I bleed mine almost every ride. Its amazing how much pressure they do build in a short period of time.

  • red7

Posted January 08, 2007 - 09:04 AM

#4

Thanks guys, that's exactly what I needed to know. Maybe that's why my front suspension seems rock hard. I know it still needs to breakin and that it will never be as smooth as my WR on trails but I had to white knuckle it the day I broke it in 'cuz any little bump or rock would want to throw me off the bike.

  • Reyndogg

Posted January 08, 2007 - 11:22 AM

#5

make sure the front wheel is off the ground when you do this....

  • yami racer

Posted January 08, 2007 - 12:16 PM

#6

Also be sure to be careful not to cross thread this. It is easy to do if you are not careful....

  • Birdy426

Posted January 08, 2007 - 12:38 PM

#7

make sure the front wheel is off the ground when you do this....


Why? I do mine with the bike on the kickstand all the time...not arguing, just want to understand.
Thanks,
Birdie

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  • 2012 450 xc-w

Posted January 08, 2007 - 12:55 PM

#8

The proper amount of pressure is realized by volume. When the bike is on a side stand there is weight on the fork (sag) effectively reducing the amount of air going into the fork.

  • grayracer513

Posted January 08, 2007 - 01:45 PM

#9

The fork is supposed to have atmospheric pressure in it when fully extended. If you relieve them while they are partially compressed, they will have a partial vacuum in them when extended, which can contribute to pulling dirt into the seals.

  • Reyndogg

Posted January 08, 2007 - 02:12 PM

#10

The fork is supposed to have atmospheric pressure in it when fully extended. If you relieve them while they are partially compressed, they will have a partial vacuum in them when extended, which can contribute to pulling dirt into the seals.


bingo... this can make your fork seals go boom :lol:

I have the moose bleeders and im quite happy with 'em.

  • red7

Posted January 08, 2007 - 02:54 PM

#11

Ooops, I did it to mine while on the ground. Should I not worry about it or put it up on a stand and open them back up? Or are the valves one way and i just have to wait until pressure builds again?

  • grayracer513

Posted January 08, 2007 - 04:32 PM

#12

They aren't valves, they're holes, they work both ways, and yes, you should.

  • YZfamily

Posted January 08, 2007 - 04:41 PM

#13

I have the ones you just have to push down on! Very convient!

  • mudhog426

Posted January 08, 2007 - 08:04 PM

#14

Just when I thought I knew something :lol:
Thanks for the great info guys, you've done your good deed for the day:thumbsup:

  • Birdy426

Posted January 08, 2007 - 09:30 PM

#15

The fork is supposed to have atmospheric pressure in it when fully extended. If you relieve them while they are partially compressed, they will have a partial vacuum in them when extended, which can contribute to pulling dirt into the seals.


Thanks...I never thought about that...learn something new here every day.





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