I know what you mean about small areas. My track behind the house is on 14 acres. Now that I have my jetting right, I can't get out of 3 gear. On the straight away I have to shut it down before I wind out 3rd gear or I'll be swimming in the creek. When I want to open it up we ride along side and in the North Canadian river. This link shows our riding area, it's not up to date because it doesn't show all the trails we have made. Also the river is full of water, most the time it's only 3 to 12 inches deep and winds back and forth across the river bed like a small creek. The dirt road along side the river is 5 miles long, lots of room to go WFO or WOT.
http://www.flashearth.com/?lat=35.507466&lon=-97.423337&z=14.4&r=0&src=2You can open it up at Little Saraha Oklahoma.
http://www.flashearth.com/?lat=36.548932&lon=-98.889466&z=13.2&r=0&src=2As far as what a KX500 is worth, it's the old saying,"It's worth what ever you can get out of it". To me it seems like they don't bring big money on ebay. The KX500's that are in good shape don't meet the reserve. As soon as I get some extra money together I'll buy one of those " I like the bike but it's to FAST for me, so I'm selling it".
Here is a quote from a guy with a KX500 on ebay right now "I bought this last year and am selling this because it is not the best bike for me to use to ride with my kids and their little 80cc quad. Also my wife wants a new kitchen floor and this will my floor money". I've seen alot of statements on ebay like this.
Danger