OS Engines GT15HZ II 15cc 2-Stroke Gas Version Engine with PowerBoost Pipe Muffler for 700 91 Class RC Helicopter Petrol Engine

2nd Gen GT15HZ 14.95cc Gas Engine, The World’s First Dedicated 700-Class Helicopter Gas Powerplant

Large Blue Anodized Aluminum Cooling Head + Auxiliary Rear Heat Sink, 15℃ Lower Plug Temperature Than 1st Gen

Tuning-Friendly Walbro Carburetor, Much Easier Mid/High Speed Adjustment Compared to Original GT15HZ

2.47HP Peak Output at 14000RPM, Stable 2000–16000RPM Working Range for Aggressive 3D Flight

Integrated Rear Cover Heat Dissipation Structure, Simplifies Daily Cleaning & Long-Time Flight Cooling Stability