Ok this probably won't make me popular. A year ago I was a Yamaha supporter. I had an 01 wr250 which taught me more about riding than I thought was possible which reached its its life expectancy at 6500km (no valve clearance) I then traded to an 03 450 with the magic button. apart from the 3 months when I couldn't get parts to fix the starter clutch it was heaven........ until at about 7000km the gearbox chose to fail. No 5th gear damaged 3rd dogs and syncro's bent shift forks etc. I guess even more scary when we opened it up was the general degradation of the entire internals, worn gears worn timing chain worn valves sad piston, rings and all things not seen from the outside. Needless to say I bailed. I guess this post is about what do you consider reasonable mileage for an enduro? bike. My experience is that 6-7k is the reasonable life expectancy of the best 4 stroke currently on the market. As consumers are we cool with this? Is my experience unusal? I know someone will tell me they got 250000k out of their crf with only a fuel top up....... Don't get me wrong I still believe the wr 450 has the best engine ever installed in a dirt bike. I'm just unsure of the price we all pay for this pleasure.