OSMG2053 OS 21XZ-B V2 ABC Racing Engine.

 - High performance crankshaft with silicone filled intake passage and tungsten counterweights
 - Lightening holes in cylinder head reduce overall weight
 - 22B2 single-needle slide valve carburetor
 - ABC piston and liner construction
 - Optimized power band

Displacement: 0.213 cu in (3.49 cc)
Bore: .641" (16.27mm)
Stroke: .661" (16.8mm)
Practical RPM: 3,000-41,500
Power Output: 2.7 PS @ 34,000 RPM
Weight: 12.77oz (362g)
Distance Between Mounting Holes Same Side: 0.83" (21mm)
Distance Between Mounting Holes Opposite Side: 1.45" (37mm)