Displacement: 0.129 cu in (2.11 cc)
Bore: 0.545 in (13.85 mm)
Stroke: 0.551 in (14.0 mm)
Practical RPM: 3,000 - 30,000
Output: 0.60 hp @ 29,000 RPM
Weight w/o muffler: 8.28 oz (234 g)

Displacement: 0.181 cu in (2.97 cc)
Bore: 0.638 in (16.20 mm)
Stroke: 0.567 in (14.4 mm)
Practical RPM: 3,000 - 32,000
Output: 0.80 hp @ 31,000 RPM
Weight w/o muffler: 8.74 oz (248 g)

Displacement: 0.213 cu in (3.49 cc)
Bore: 0.640 in (16.26 mm)
Stroke: 0.661 in (16.8 mm)
Practical RPM: 3,000 - 38,000
Output: 2.25 hp @ 30,000 RPM
Weight w/o muffler: 13.76 oz (390 g)

Displacement: 0.282 cu in (4.63 cc)
Bore: 0.720 in (18.30 mm)
Stroke: 0.693 in (17.6 mm)
Practical RPM: 3,000 - 35,000
Output: 2.40 hp @ 30,000 RPM
Weight w/o muffler: 16.23 oz (460 g)