This is the O.S. Max .91 RZ-H DH Rear Exhaust Helicopter Engine. Brand New
in Box
Features:
- 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
Includes:
- O.S. Max .91 RZ-H DH Rear Exhaust Helicopter Engine with #8 glow plug, instruction
manual
Specs:
- 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)






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