My son is really into MX'ing and I bring my 1998 KDX out too. He seems to think that my bike is absolutely incapable of doing the things a true MX bike can do. When I purchased the bike, I picked the KDX over XR's because of the light weight and the powerful 2 stroke engine would be good in all worlds. Are the MX'ers really that much different? Will my bike die a terrible death on th MX track? Should I sell it now and get a MX bike???? I'm 43 and not trying to set the world on fire but I do take some big jumps and am typically either wide open or on the brakes.