I have a '91 xr600r and I bought an extra shock off ebay that i'm trying out rebuilding. I have it appart and the seal head looks alright, so I was just going to change the oil and get it re-charged and see if what it feels like. My question is what oil (kind and weight) should I use? I am 220lbs and ride some pretty rocky stuff, I know the my stock suspension is not adaquete for me but I don't have the money to upgrade so I wanted to get the most out of what I have. I have bought some bel-ray 15w Fork oil that I was going to put in my forks and I also have some Yamaha SAE20 Fork and Shock Oil, I was going to try this in my shock. I want some higher weight oil in my suspension to stiffen up my dampening for my fat ass....right? Will these oils work? I have read a ton of of articles and been to all the suspension pages out there, but this suspension tuning crap still seems so confusing to me, I can't make heads or tails of it. Any advice would be welcome.