OSB21ADC3 O.S. Speed B21...
Combo Set(TB02 EFRA2089(T2090)+MB01-75(M2000SC)
Spec---------------------------
Displacement: 3.49cc / 0.213 cu.in.
Bore: 16.4mm / 0.646 in.
Stroke: 16.55mm / 0.652 in.
Output 2.65 ps / 2.61 hp / 34,000 r.p.m.
Practical RPM range: 4,000-42,000 r.p.m.
Engine Weight: 350g / 12.35oz