Lean it in a few clicks at a time till it starts producing power.

OS engines are great but don't make any assumptions.

Always snug the head bolts, pull the back plate and check for machining scraps and snug the back plate bolts when your done putting the fan and prop nut on.

Open about 2 turns out on the high and start adjusting from there. Every OS engine I've ever ran out of the box needed the low end leaned anywhere from a tad to a good bit, if your idle isn't smooth and transition is sluggish lean the low end a tad at at time but get the high end in the ball park first.