I would check a few things. First start with the plug. It isn't uncommon for them to become oil fouled during the break in period. If you are running the original Chinese one then you will want to change it for a NGK B5HS or B6HS. Sick Bike parts carries them if you need one. I would check the head bolts for tightness too.

After that I would check the intake and carb for leaks. I spray carb cleaner around the joints on mine and if the engine loses rpm I know I have a leak.