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
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