OS Speed ​​Engine B2104 (1) - 1DA00

B2104 motor is a long stroke motor, bore x stroke is 16.27 x 16.80mm. It has quicker low-end response and more mid-range torque with a smooth idle.

The new piston/liner is a conventional 3-port type, allowing more torque across the entire power range.OS Speed ​​Engine B2104 (1) - 1DA00

The new crankshaft has a DLC coating, as we always do with OS SPEED engines. The two tungsten counterweights are embedded in the crankshaft and ensure smooth idling and a rapid reduction in speed depending on the throttle movement.

The surface treatment pressure plate embedded in the cover plate reduces friction on the connecting rod and extends its service life.

The crankcase boost port and exhaust port have been redesigned for optimal airflow.

The carburettor is the proven 22E carburettor that we have already used for the B2103 Type R.

The cooling head is a conventional round head with a standard height.

Displacement: 3.49ccm / 0.213 cu.in.
Bore: 16.27mm / 0.641 in.
Stroke: 16.80mm.
Power: 2.68 hp / 2.64 hp / 34,000 rpm.
Practical speed range: 4,000-42,000 rpm. Weight: 352g
Standard accessories
Glow plug T-P3 ・Reducer φ6Ⅱ、φ6.5Ⅱ・ Exhaust seal ring
Dust cap set 12-30(φ3、φ16、φ18)