I got this if trinityracing.com hope it helps.
A: Almost all problems that will occur will be from a lack of attention to jetting or the break-in. Please follow all of the following instructions carefully.
1. The break-in is very simple. All you have to do is start the engine and let it idle slowly. Do not rev the engine at this time. Do this until the cylinders get hot to the touch (about 3 minutes).
2. Turn off the engine and let it cool completely. After this, you must re-torque the base and head bolts (repeat steps 1&2 three times before moving to step 3).
NOTE: If you have a head stay on your bike, this must be loosened before you re-torque your head (a heady stay is a mount that goes from the frame to the head).
3. After the third re-torque, you can start the bike and ride it. Please avoid lugging or revving the engine. Just ride it nice and easy for about an hour.
4. After an hour of riding time, you should let it completely cool off again and then re-torque the head gasket only. Check the water level (you want to keep it about one inch over the core, do not fill it to the top). Ride the ATV again and try to keep the RPM under 9,000 and don't lug the bike. Get about 10 hours of riding like this.
5. Congratulations! You can now ride the bike as hard as you please!
6. Be sure to watch your jetting and remember that a big engine needs air to run properly. You may need to modify your airbox or filter.