Ok here is the deal, I have an 09 xcw450 shock on my 300exc (previous owner changed it) I am not 100% sure if its just the fluid, or if the nitrogen has a play in this, but I feel like the action isn't as fast as it should be, seems like the fluid is too thick to me. when I turn the rebound all the way to hard, its almost rock solid. I am just wanting to know what are the needs for a shock fluid change? seals, oil weight, any special tools, or can you get by with daily tools. I would like to do it all myself (I know I can't fill the nitrogen) how much should it cost to do a nitrogen charge, and what ibs should I do? what is the difference in difference amount of nitrogen? I plan on doing this, this winter, and I want to get as much need knows as I can.