Also, while breaking it in, just let it idle for the first couple of tanks, giving it short bursts on the throttle to prevent oil build up.
after that, do what Zandor said, with the leaning out for power. (not to lean or hot! temp gun is a must)
Just drive it slow for a couple of additional tanks, giving it light throttle bursts.
PS. get a fail safe and or a throttle return spring. You don't want to lose that new buggy....goodluck and welcome to the world of nitro.