All 2st Fork Seal Replacement And Set Up Questions

So I think the clean the seals trick is no longer working on my son's 2004 cr125. I am going to replace the seals, but I am unsure of what weight oil to put back in the shocks.

Any other things to check while I have them apart?

He is about 170 lbs if that makes a difference.

thanks in advance.

We use 5wt at 100mm fully compressed, also re install the tubes without seals to check bushings for any play after cleaning. Torque upper clamps at 18 f/lb
and lowers at 12 f/lb. I also usually loosen the head set to make sure the triple clamps are perfectly aligned.

thank you.
I found the manual on my hard drive but haven't gone through it yet.
Hopefully I can get him up and going soon!
We rode taneum last week and had a blast. Down time right now is precious.