Displacement: 1.00 cu in (16.38 cc)
Bore: 1.14 in (29 mm)
Stroke: 0.98 in (24.8 mm)
RPM Range: 2,000~16,000 rpm
Output: 3.91 hp @ 14,500 rpm
Weight: 22.0 oz (625g)

Displacement: 0.553 cu in (9.05 cc)
Bore: 0.906 in (23 mm)
Stroke: 0.858 in (21.8 mm)
RPM Range: 2,000-21,000
Output: 2.23 hp @ 17,500 rpm
Weight: 13.8 oz (390 g)
Includes: Redline R3 glow plug

Displacement: 0.529 cu in (8.27 cc)
Bore: 0.886 in (22.5 mm)
Stroke: 0.858 in (21.8 mm)
Practical RPM: 2,000 - 21,000
Output: 2.1 hp @ 17,000 RPM
Weight: 13.40 oz (380 g)
Includes: Redline R3 glow plug