I really love my 650 X challenge, but the limited fuel range has been a problem. Many places we like to ride, don't have fuel available and I need more range. Didn't really like the look of the very oversized Touratech monster tank nor did I like the high price tag that went with it. I have been looking at a 1.5 gallon tank made by Kolpin. You can get them several places. I got mine at Rocky Mt. http://www.rockymountainmc.com/productDetail.do?navType=type&navTitle=ATV+Accessories&webTypeId=170&webCatId=24&vehicleType=&pageLinkUri=&prodFamilyId=11787 My luggage rack has an aluminum top plate held in place with three bolts/screws. I had figured I would just remove the top plate and adapt the tank mounting rack so it could be secured to the luggage rack using the same three screws. However, I found the screws were very small (M5) and the mounting tabs were very weak looking. So I had to remove the rack and add some additional (and stronger) mounting tabs. Once the paint was dry and I reinstalled the luggage rack, I could start fabricating the tank mount. It was a fairly straight forward project. Here is the tank mount: Notice the cut out area so I can get the key in to remove the seat with the tank rack in place. With the tank in place: The tank rack can be quickly removed and the stock top plate installed when I don't need the extra fuel range. I also wanted a way to mount a tail bag for those multi day trips. I made a aluminum plate that can mount on top of the luggage rack with either the tank rack in place or removed. The plate mounts using the same three mounting screws as the original top plate. The tank claims to hold 1.5 gallons. I went to the gas station and put 1.5 gallons in the tank and still had a little room left. You may of noticed that I choose to go with the white (water) tank as opposed to the red (gas) tank. I looked closely at both tanks and they appear to be the same except for the color. I figured I would like the look of a white tank rather than a red tank. The red gas tank will fit the same rack. I figure my range is now well over 200 miles. That is the same of my wife's LC4 with the 5 gallon tank on it. Next weekend, we plan of taking a long ride in SE Oregon where gas stations are few and far between. We will get a chance to put the new tank to the test. This was a fairly easy project that almost anyone with normal shop tools including a welder, cutting torch and grinder could do. Total cost for the tank, mount, aluminum, iron and bolts came to just under $100.