i have a kxt250 powered gblaster sittin in my garage... might give a 250r a run but its a pita to launch..
for a blaster to hang with a 250r your gonna nead big carb, mucho porting, stroker, head work, the best pipe you can get, timing mod.. even then you may hang with him for the first few hundred feet but in the long run the r willl out run you..
there is a dirt wheels artical posted on airfoolers they did compairing the 450r to the 250r... needless to say there very compairable machines.. there 250r is stock except for a ct pipe and jetted and the 450r has ct pipe and jetted... 250r dyno'd 36hp just on a pipe ( which isnt even a great pipe for them) and the 450r did 44 BUT in a sprint... the 450 pulls the 250r outta the hole but than the 250r starts to real it in..
a blaster is fun BUT the 250r is god, 20 years after they stopped making them there still kickin ass and taken names! there frame geomitry was ahead of its time (400ex uses simmaler frame) there suspension was ahead of its time, and there motor was a animal!!! and everyone still makes stuff for them... and bb kits galor!! many many options... 265 195 310 330 and 350.. can get 330 and 350 power valve set ups for them...