I have just got my first 48cc. And it is open.
Bore: 40mm as expected.
Stroke: 38mm as expected.
Inlet open: 108° (18.5mm wide)
Exhaust open: 143° (23mm wide)
Transfers open: 110° (19mm wide)
The porting times are measured including the piston ramp which is about 0,8mm. Unfortunately, I do not know which company has produced my engine.
For me it would be interesting to know the timing of other HT engines.