I'd echo what the others have said - the XR400 is a great bike in the sand... if you are worried about the power when compared to newer watercooled bikes, then stick a 14t front sprocket on with the 45 rear, and it will noticably improve the performance (I doubt you'll want to do more than 60mph on sand?) - as BDG said: lower (correct for the conditions) tyre pressures play an important part in helping the engine to not work as hard too...
I have an '03 XR400R with the gordon mods (open pipe and airbox, rejetted etc.) and it basically has the same straightline performance as a KTM400EXC... the XR may feel a little heavier (although we are only talking a few Kg's at most), but the weight is carried low, and it is very tractable in comparison to the newer and more revvy 4 stroke bikes out there...
xxx
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