The Latest and Greatest 91 Heli Motor from OS !!! FEATURES: Pressurized on-demand fuel regulator system for consistent fuel delivery regardless of attitude, throttle changes or amount of fuel in tank Modified two-needle 61E-R carburetor with high-and mid-speed needle adjustment and idle control mixture adjustment Designed specifically for F3C aerobatic competition Rectangular heat sink allows engine to be enclosed entirely inside cooling shroud Newly designed piston and crankshaft for reduced vibration and improved torque stability over entire RPM range Ball bearing supported crankshaft Heat sink type backplate Two year limited warranty through manufacturer beginning at date of purchase

INCLUDES: O.S. .91 HZ-R F3C Competition Helicopter Engine with #8 glow plug, needle control lever, extra 0.2mm head gasket, cap screws and instruction manual

SPECS:

Displacement: 0.91 cu in (14.95 cc)
Bore: 1.09" (27.7mm)
Stroke: 0.98" (24.8mm)
Output: 3.4 hp @ 15,000 RPM Practical RPM Range: 2000-16,000
Weight Without Muffler: 1.37lb (625g)
Crankshaft Size: 5/16-24