Features :
- O.S. 91RZ-H DH Rear Exhaust OSMG1979
- Diecast cylinder head
- Designed for Hirobo and other scale helicopters where engine must fit inside canopy to preserve heli's scale lines
- Ringed piston
- 60M-C 3-needle carburetor with mid-range needle for precise adjustments
- Two year warranty

Specifications :
- Needle Settings; High Speed Needle Valve: Two turns OPEN from fully closed
- Idle Mixture Control Screw: Factory setting
- Medium Speed Needle Valve: Two turns OPEN from fully closed
- Displacement: 0.912 cu in (14.95 cc)
- Bore: 1.091" (27.7mm)
- Stroke: 0.976" (24.8mm)
- Practical RPM: 2000-16,000
- Power Output: 3.3 ps @ 15,000 RPM
- Weight: 22.0oz (623g)
- Crankshaft Size: 5/16-24
- Distance Between Mounting Holes Same Side: 0.98" (25mm)
- Distance Between Mounting Holes Opposite Side: 2" (52mm)
- Distance From Back Plate to Front Bearing: 3.3" (83.8mm)
- Distance From Back Plate to Crankcase Center: 1.1" (27.4mm)
- Distance From Crankcase Center to Front Bearing: 2.2" (56.4mm)
- Distance From Crankcase Center to End of Crankshaft: 3.5" (88.7mm)
- Width at Mounting Tabs: 2.4" (61mm)
- Width of Crankcase Below Mounting Tabs: 1.7" (42.6mm)
- Distance from Throttle Lever to Center of Crankcase: 1.7" (42.5mm)
- Distance/Bottom of Mounting Tab/Top of Cylinder Head: 3.2" (81.2mm)

Package Contents :
- O.S. 91RZ-H DH Rear Exhaust OSMG1979
- with #8 glow plug
- instruction manual