120SRX Helicopter 2 Cycle Engine.
The Head Cooling and Air flow has been improved from old 120SR.

120SRX is the ultimate/complete version of 120SR.

Features:
New crankcase design for increased power and efficiency.
New oversized cylinder head for more efficient heat dissipation
New balanced crankshaft for smoother operation
Steel lined back plate to decrease drag for more power
applicable Glow plug: YS/#2, Enya/ #3, #4, #5, OS/#7, #8
Muffler: Hattori 120FS-3C, 120FS-3D

Specifications:
Displacement:19.96cc
Bore:30.4mm
Stroke:27.5mm
Practical RPM:2,000-16,000
Weight:582g

Accesories:
2 Cycle Glow Plug
Fuel Magnet Clunk