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This is the Novarossi R91HR 3D 8 Port Short Plug Helicopter Engine.

Specifications:
Displacement: 14.98cc
Max. power: 3.60HP
R.P.M (Max. power): 15,500 R.P.M.
Practical RPM Range: 2,000 ~ 16,500 R.P.M.
Bore x Stroke: 27.70x24.80mm
Transfer Ports: 8
Rear Ball Bearing: Steel
Crankshaft Type: 18mm - 5/16" x 24
Carburetor Type: 9mm Rotary
Material: Aluminum
Adjustment: Single
Glowplug Type: Standard - C7G
Exhaust Position: Side
Fuel Type: Advise 10% ~ 30% Nitro