Stock Number: OSMG0557Displacement: 0.545 cu in (9 cc)Bore: 0.91 in (23 mm)Stroke: 0.85 in (21.5 mm)Practical rpm: 2,000-17,000Output: 1.68 hp @ 16,000 rpmWeight: 14.3 oz (404 g) w/o muffler 18.52 oz (525 g) w/ mufflerIncludes: #8 glow plug, E-3071 Power Box muffler & needle valve extensionRecommended props: 11x6, 11x7, 12x6, 12x7, 12x8 & 13x6