marinep51
ignition problems mostly (easily solved with a RCEXL unit) but also carb issues, and then the odd user issue due to misinterpretting the aforementioned issues and leaning out the engines too much.
Most recent failures I've seen is broken crank pins. In one case it was the the owners 2nd unit.
It was O.S first gasser and I dont think they completely thought through how get their glow engine market become sensitive to the challenges of gassers.
The 33GT is a massively better engine so I think the 22 (although portly) will be good as well and since the 60 will follow a proven formula I'm guessing OS won't get it wrong this time.
That said, theres plenty of people who did not have issues with the 55GT.