I can't find the manual for the Super 8 150 either. That Super 8 50 is good and I can't believe that there isn't one out there for the 125 or 150.
The Dink 125 valve clearance appears to be .1mm for both the intake and exhaust and I have to assume that it is a similar engine.
Do these little guys have shims the valves or are they screw adjusted?
I did the valves on my Honda VFR and had to do 16 valves! What a pain for no significant change.