My neighbor just put his house up for sale, and had this Honda 185cc ATC sitting in his back yard for over a decade.
I asked him if he wanted to sell it, and he replied: "It's dead. Probably needs a new engine, at least. You want to mess with it, you can have it."
Sweet! So I rolled it over into my backyard after inflating the tires, and started tinkering. First thing I did was drain out the old gasoline. Then I checked for spark, which it didn't have. So I went through all of the electrical connections, replaced all of the blade and eyelet connectors, etc. I filled it up with fresh gas, changed the oil, sprayed some starting fluid in the air intake and it started right up! I had to let it run for a bit before it would run smoothly. Then I took it out front and shifted through the gears. They all work perfectly!
The carb is a bit leaky, but a new one is only $50. The tires are dry-rotted, and the brake cables (and probably the brakes) are seized. I'll get on that tomorrow. Hopefully some WD-40 will remedy that, as it did for the throttle cable. It also needs a new seat pad, which I'll likely fab up myself.
I figure $200 or so and it will be ready for the trails. ;D