Break it in with a petroleum based oil and not the one that came with it... Use Penzoil Air Cool 2-stroke.
The engines are totally bullet proof once broken in, can swing a 26x10 @ 6000 rpm,
Best prop for 3-d on them is a 23x10 bolly, spooling to 7400 rpm VERY quickly.
For imac type flying a 24x10 would be really good.