I've just sold my reliable and trusty XR650R.Loved the engine but need something a bit smaller/lighter like the WR450F. What potential problems or issues should I be aware of when searching for a 2003-2005 WR450F? I loved he rock solid rep of the XR650R. How does the WR450F compare? What type of valves and adjustments does the WR450F take? Any cheap tricks to make it more reliable, lighter and more power?