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OS SPEED's off-road racing engine has evolved even further! The 4th generation of the B21 series, the "B2104" is a long-stroke engine that has improved response in the low range, more torque in the middle range as well as consistent idling.
Displacement 3.49cc / 0.213 cu.in.
Bore 16.27mm / 0.641 in.
Stroke 16.80mm / 0.661 in.
Output 2.68 ps / 2.64 hp / 34,000 r.p.m.
Practical rpm range 4,000-42,000 r.p.m.
Weight 352g / 12.42 oz.