Do you mean a new KTM 500cc 4-cycle like the 525 compared to a Kawasaki 500cc 2-cycle? What are you trying to find out torque and horsepower? I've read in general that for the same amount of displacement a 2-cycle generates 30% more power than a 4-cycle. Also, 2-cycle engines weigh less. I don't have any dyno results. But, a guy here named stewart has done a lot of dyno work with the KX500. I have no clue about the 525. I've ridden some 450s and compared to my KX500 they are kinda sluggish.