Stu,
An XR250 is geared a lot different than today's MXers. You have to really zing the modern bikes so they make more HP than a 1/2 sized 2 stroke. Whereas the XR250 was never entered into the HP wars and just lugs along. They built a bike that works (like an old Toyota Hilux!). It may not be the fastest, but it keeps going...and going...and going!
Thats so true. I don't have a problem with the old 4 strokes. Less revs, less power = longer lasting engines.
I had a TT600 2 years ago and it was fun except I am not big enough for a 145Kg bike.
KIWI: Hell yeah. I absolutely wailed my little XR100r for a good 3 years and it still hasn't skipped a beat. And it still hauls my 87 kg butt around no worries.
VBS: I was referring to the enduro bikes of today, sorry if that wasn't clear. But you're right though, even with double displacement it still needs to rev high to pump out the HP so that the fooper troopers can say: its got more power. Anyway my point was that an old XR can take on any of the modern enduros. Goes to show that these advanced bikes that everyone is paying 12k for (in Australia) is worth a whole lot less than a bike you'd pay 2 or 3 for (A good condition XR). High revs= high costs.
I too am an XR fan. I learned to ride on a XR100 (now my wife's bike). I moved up to a XR250R, that I still have, and my dad rides a XR400R.
What you said is very ture, they lug and lug and last forever. So why buy a newer bike or a 2-stroke? Weight and chassis. My XR250 weighs a good 30-40lbs more than my KTM 380SX. The XR400 was measured by us at 45lbs heavier. That makes a big difference in the technical sections. The weight of the XR250 is better, but it doesn't have the power for bigger, steeper hills, especially anything with sand. The XRs do have great suspension though, much better than the KTM. My dad is looking at getting a newer KTM 500EXC to drop 25lbs from his bike, or an out of state street legal 300 for even less weight.
I guess my bottom line is, the XRs are good, rider skill is most important, but same skill on a better bike will do better with less exhaustion. When you look at Erzberg and Romaniacs results, it is impossible to deny the 300 2-stroke is king of hard enduro.