there junk blaster motors are way better, hence why there in the blaster. dt250s are worthless and blow up at the drop of a hat. i dont know if they bolt up or not but i wouldnt even try, if you want a good motor to put in your blaster, one thats a little better find yourself a yz 250 motor, or do what my friend did and fully costomize it and throw in a suzuki cb 650 crotchrocket motor!!!! that was almost too fast, he extended the swingarm 18 in and put drag racing slicks on it from a 67 chevell ss. it had so much power he had to modify the sprocket so there was two sprockets and two chains, he spun the bead off the tires at a drag strip here in MI, it ran about 123mph, and got a 1/4 mile time of 9.76 seconds, and holds the record at kaleva drag strip, in Kaleva, MI. if your gonna modify you may as well do it right! good luck with that dt250 motor.