The engines in these WR's last a long time compared to a Honda CR
I have a friend with a CR and he has to adjust the valves at least every season
The bike I have is a 2006 WR450 with about 2,000 miles on it
I just popped the valve cover off and measured the valve clearance and they are all within spec!
.....After 8 years and over 2,000 miles I think its incredible
Esp when you compare this against any CR Honda !!!