O.S. 91RZ-H Ringed Rear Exhaust OSMG1978

Features

• O.S. 91RZ-H Ringed Rear Exhaust OSMG1978

• Aluminum cylinder head, anodized blue in color

• 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 cid (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: 21.82oz (618g)

• 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 Crancase 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: 3.4" (87.4mm)

Package Contents

• O.S. 91RZ-H Ringed Rear Exhaust OSMG1978

• with #8 glow plug

• instruction manual

Requirements

• Fuel: Heli blend with 10-30% nitro content