I've got all three of the engines you mentioned, but I haven't run them yet.

Here is the MT80 info:

MT80 Displacement: 80CC
Output: 8+ hp
Weight: 3.85 lbs (1.75 kg)
Bore: 2.16 in (52 mm)
Stroke: 1.49 in (38 mm)
RPM Range: 1200 to 7500
RPM Max: 8500

The HP is just a guess by them don't put any money on it. The engine seems very well made and uses DA85 mufflers and headers so that stuff is readily available.