250-500cc 2010 WR250 Fork Oil Change

Can anyone provide me with a link or sme direction for changing the fork oil on my WR. Done a bunch of conventional forks over the years but never messed with USD forks. Pretty sure the oil is original. bikehass about 100 hours on it. Oil weight recommendations are also welcome. Thanks,Paul

http://docs.wavenetworks.us/manuals//2009-2010%20WR%20250-300.pdf

page 246 upwards for the Marzocchi

For the Kayaba, takes this one
http://docs.wavenetworks.us/manuals//2010 TC-TE-TXC 250.pdf

Page 238 upwards

It's the four stroke, but same fork, excepted the spring rate.

KYB: oil level between 80mm and 150mm.

I have 140mm but for the 125cc and I'm ~82kg with gear.

All parts available at technicaltouch.

jeanjean

Edit: source: https://husqvarnaoutlet.com/repair_manuals

The open chamber Kayaba forks on my WR300 2010 are pretty easy to maintain, just follow the OEM manual instructions. I like to use an OIL that is almost the same viscosity as the original Kayaba oil, you can have a look at several viscosity comparison tables and/or search for the datasheet PDF of your oil to find out the actual viscosity:



You want to be near the 17.00 cSt @40`C, as you see not all 'SAE 5' oils do have the same viscosity so I prefer to look for the actual cSt value and not rely on the SAE number on the bottle.

For example the last oil I used was BelRay Fork Oil 5wt that's and 20,50 cSt so it's more viscous than the original Kayaba so I mixed it at a 3:1 ratio with some BelRay Fork Oil 2,5wt thats an 9,20cSt, giving me a estimated result viscosity of 16.73cSt.

In your case with 100hrs I would also consider changing the seals and depending on the wear maybe the teflon coated 'rings'.


Regards.

Thanks a bunch guys.