Does it go right only when the wheels are on the ground? If you roll it on a smooth surface, with all surfaces centred, and no power, does it go straight then? If not, adjust the steering arm on the nosegear to make it go straight.

Once that's done, it's quite normal to have to add some rudder (usually right rudder) while the plane is on the ground. This is due to the spiral propwash blowing the tail to the side slightly.

If it only happens when the throttle is increased agressively (such as on run-up for take off, or when increasing throttle on a touch and go), it may help to adjust the engine thrustline. In this case by removing some of the existing right thurst.

Check the nosegear for straight (as above) first.

J