Update
For those that are interested, I was at the factory last week. The Jabs in question are up there with modifications being made to the engine cowls to promote cooling of oil and the cylinder heads. Ducts and holes and scoops etc have been added all over the shop. I quizzed them on the cause of the cylinder failure's and the result was the way they were operated and the amount of time spent on the ground.
Personally I don't understand how so many of these aircraft are operating world wide in all temperatures exceeding their POH documented maximum, but yet 2 x J160's at Bankstown have been having problems. I know of a school that has clocked 5,000 hours in the last 3 years with nil issues, even with their highest hime J160 nearing 2,000 hours.