O.S.speed R21 shimo edition w/ t-2080sc muffler
Displacement： 3.49cc (0.213cu.in)
Bore: 16.08mm (0.633in.)
Stroke: 17.2mm (0.677in.)
Practical RPM: (4,000~45,000r.p.m.)
Power Output: (2.80ps/33,000rpm 2.76hp/33,000rpm.)
Weight: 340g (11.99oz.)