The only engine for O.S.SPEED R21 EURO II Combo Set (OS-1DR01)

[ SPEC ]
Stroke volume: 3.49 cc / 0.213cu.in.
Bore: 16.08mm / 0.633 in.
Stroke: 17.20mm / 0.677 in.
Output: 2.8 ps / 2.76 hp / 35,000 r.p.m.
Practical rotation speed: 4,000-45,000 r.p.m.
Weight: 340g / 11.99 oz.