I need to replace the oil seal on my rear shock. I have the service manual and there is no information about the rear shock rebuild process or any specs. Is rebuilding the shock on my 2003 YZF 250 any different than rebuilding the shock on my 1997 CR 250? How high do I fill the shock with oil and what type and weight oil should I use (220Lb rider). How many PSI of nitrogen should I put back into the bladder? Thank you.