Reason i kept my xr and didn't sell it is because they are probably one of the strongest built or most reliable engines Honda ever put out.
Original top end, original EVERYTHINg inside the engine and its running like the day i bought it 8 years ago. Although i really SHOULD consider a new top end \
Mud, snow, rain, rocks, logs, roots, swamp, sand, grass, this bike has been through it all! Swamped my bike JUUUUUUUUST under the exhaust, started up first kick when i pulled it outta the water. XR's, ya can't beat 'em