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

This is the O.S. Max .91 RZ-H DH Rear Exhaust Helicopter Engine.

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
          Two year warranty

INCLUDES: O.S. Max .91 RZ-H DH Rear Exhaust Helicopter Engine with #8 glow
            plug, instruction manual

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

SPECS:    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)