OSB21RDC O.S.SPEED B21...
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 r.p.m.Range: 4,000-42,000 r.p.m.
Weight: 362g / 12.77oz