I'm pretty sure it has the same fuel valve as the Intruder 800, which is a pain in the ass. I usually turn off the fuel, remove the side cover, then the big fuel line (points downward, goes to the carbs), then unbolt the valve. DO NOT remove the two small lines going to the valve, as they are stright from the gas tank, and you'll pour fuel all over the garage. Then carefully slip the valve through the frame rail (careful not to scratch!). If your doing the first service it is HIGHLY recomended to get the valve adjustment checked, and the carbs sycronized. The carburator setup on Marader/Intuders is a little different than most other bikes, and takes finesse to get right. I've worked on many of these before, it's just hard to remember every detail from memory when you work on 6 or 7 differnt bikes a day. Just take your time, look at it closely, and think things through. Also, I like to check chain slack, brake pad/shoe wear, tire wear/pressure, brake light adjustment, steering head bearing play, suspension, and chassis bolts. Good luck!
G20 = attitude adjuster
My friend said it best "Guns are cool"
#1340 10mm Reloading & 10 Ring member