This is how I break in any new sled or new engine.
Put a little extra oil in the first tank of gas.
Use the same oil you will be running in the oil injection tank. The dealer might have done this already so ask.
For this first tank of gas run the sled varying the RPM's. Do not hold it at a constant RPM for any extended time during this break-in period. Also, NO FULL THROTTLE for this first tank of gas. You can bring it up quick but try not to go over half throttle. Do this for the entire first tank of gas.
After that, Ride it like you stole it!
I only recommend this procedure to you because anyone who has followed it has never had a problem and ended up with a sweet running engine. That is providing it was put together right in the first place. Good luck and have fun!