O.S. Engine #12180 - 21XZ-B  [OS-12180]

Specifications:

Displacment: 3.49cc (0.21 cu.in.)
Bore: 16.27mm (0.64 in.)
Stroke: 16.8mm (0.66 in.)
Practical R.P.M.: 4,000-40,000 r.p.m.
Energy output: 2.55 ps / 33,000 r.p.m.
Fat: 362 g (12.52 oz.)