If you're getting a right turn on takeoff then something is wrong with your setup. I would suspect the tail wheel first. If the turn happens suddenly as the tail wheel or nose wheel comes up off the ground, then you have a crooked main gear. A slight left yaw is normal if you just gun the throttle with no rudder on trainers and sport planes. Once they get some airspeed, they will track straight if the gear is set up right. The only exception is on a rough runway where the bumps can catch one wheel and turn the plane.