757 Jonp
I think it is clear that this engine TDC Spacing is not 0, 120, 240.
Several people have checked ther engine's and have same result.
This is my First radial engine and i am also surprised finding this but have now accepted it and
have manufactured a new prop hub.
I have many glow engines 2-stroke and 4-stroke OS and Ys and have not needed to manufacture modified part other than exhaust system. I think this engine have 3 issue. Timing from factory 45-50 degree Tdc and not possible to adjust close to 30 degree. Various timing on each cylinder. Intake design not perfect ( cylinder 1 lean and cylinder 2 and 3 rich).
Cooling fins are not big and engine need proper baffling to have low cylinder temp
Timing and intake issue can be solved.
The engine have great sound and are perfect for scale airplane If it is not to heavy.