This brought back a shameful memory. When I was 15 or 16, I bought a mint Honda Dream 305cc from my local bike shop for $25.
I took it home and cut off the fenders and mufflers, then took it up to the old abandoned horse racing track (grass track) early one morning and proceeded to ride it flat out (70 MPH) until the engine seized and threw me down the track.
I reckon I slid in the wet grass for 100 yards, and got up, wet as a shag, but otherwise unhurt. I pushed it back home and stripped it into large lumps, and stored it behind my Dad's garage, and forgot about it.
A couple of years later my parents sold that house and as I was in the Army by then, my friends took all my bike parts away, and I never saw that stuff again. It'd probably be worth a few bucks now, oh well, the things you do when you're young and dumb..........