Breaking in a new motor

I just received my new 6hp 4-stroke tohastu motor. I setup the engine to be ready to get broken in with the external gas tank and motor oil. I realize it is suppose to vibrate a bit as it is getting broken in so When it started and was vibrating like a 2-stroke I paid little attention to it. After 10 minutes in idle, I attempted to increase the throttle but it did not respond. I could not get the engine to rev up by throttling up with the handle. When I throttle down the engine promptly shuts off. I checked under the cover and made sure the carb, choke and gear linkages are all working correctly. When I attempted to shift into gear it will go and push the boat for a couple of seconds and dies immediately after. It has no problem starting back up but the throttle persistantly refuse to rev the engine up. I can't seem to find out what the problem is and I am pretty sure it is not normal for a brand new. out of the box motor. I guess I will need to bring this bad boy for a service already. I hope it is not defective or broken somehow. That would really suck.