Front Forks

7 replies to this topic
  • fastyz250

Posted August 08, 2012 - 04:25 PM


hey guys i have an 06 yz450f and i want to change my fork oil this weekand and was wondering if its a big deal or if i need any special tools to do it? How do you reccomend changing the oil? What weight would you run? i weigh 160lbs and race mx. I do all of my own work on the bike so im pretty mechanically inclined just have never messed with the twin chanber forks before. i have an 04 as well and they are cake. Thanks

  • marv02

Posted August 08, 2012 - 04:36 PM


Go to U Tube there's Video's how to do oil changes and seal swaps.

As for the plastic fork bullets you see them use to install the seals you dont need them the trick if you do the seals wap the area with duct tape so the seal wont hang up.

For the seal driver tool get some PVC pipe cut it in half and use that for a seal instlaller.

I used a drift punch for years just take your time tap down slide to side.

I always tear the forks all the way down and clean all the crude out of them you see what I mean there most of the time a resedue in them they sell a spray for cleaning forks works great also has a good smell to it also.

Edited by marv02, August 08, 2012 - 04:39 PM.

  • fastyz250

Posted August 08, 2012 - 04:59 PM


ok thanks ill take a look and i use the exact method you talked about when i did my 04. i dont need seals yet just wanted to change the oil because its never been done. Thanks

  • APlusAutoParts

Posted August 10, 2012 - 06:15 AM


i just started doing them myself this season, its actually really easy. I wouldnt use duct tape i would assume the tape would leave a residue on your forks. the seal bullet is $6 from rocky moutain. My one friend just takes a plastic bags and oils it down before sliding over the seal. it seems to work just fine

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  • grayracer513

Posted August 10, 2012 - 06:49 AM


I wouldnt use duct tape i would assume the tape would leave a residue on your forks. My one friend just takes a plastic bags and oils it down before sliding over the seal. it seems to work just fine

Don't use tape. The plastic bag the seal comes in is perfect for the job. Use a little Vasaline or Trans Gel.

The complication with the twin chamber fork is the process of bleeding the inner cartridge. The manual is, um, a bit vague about it. Then, on reassembly, there is a very confusing bit of advice in the book about making sure there's a gap between the damper rod jam nut and the rebound adjuster/base plug assembly. Here's some details on both items:

Bleeding the Cartridge

Base bolt/jam nut clearance

  • marv02

Posted August 11, 2012 - 07:28 PM


I just use a lint free rag and acetone to wipe off the fork tube after pulling the duct tape off never has gave me any problems.

But I never heard untill now the Plastic bag trick I use that next time I do seals.

I also use some fork oil on the tubes as I slide the new seals on to help side over easy.

I also use Maxima Suspension Clean it in a spray can works great to clean out the forks and spray things off as you put back together.

Edited by marv02, August 11, 2012 - 07:30 PM.

  • fastyz250

Posted August 13, 2012 - 07:12 AM


thanks guys this helps alot im going to do mine this week after i get my tools and oil

  • antfizzle

Posted August 13, 2012 - 08:44 AM


I just panicked and read your link to the base bolt jam nut clearance, I did my forks recently, and the manual also had me a bit confused into thinking there was supposed to be a gap after everything was torqued, but I did it the exact way you posted in the link Gray, thanks

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