Did a complete tear down and inspection of my 912 ul with 1829 hours on the hobbs. The only component that measured out of spec was the gear box thrust washer. (old style brass washer) lots of lead build up. My only complaint from the engine is alittle rough running at certain r.p.m`s. My model 3 with a 912 and ivo inflight prop will out perform my friends speedster with a jabiru. The Jabiru sounds sweet, very smooth running. More of a simple engine.