DLE-20RA Single Cylinder Rear Exhaust Petrol Engine.
DLE-20cc Rear Exhaust Engine 

Auto Advancing Electronic Ignition

Twin outlet Muffler, Couplers, Clamps Gasket 

BoltsWalbro Carby

Performance                                                                                                 
2.5HP/9000rpm
Idle Speed: 1700 rpm/min
6.3Kg Static Thrust/ 100 meters Altitude       
5.6Kg Static Thrust/ 1800 meters Altitude
Recommended Propellers: 14x10; 15x8; 16x6; 16x8;17x6
Ignition Battery: 4.8v ~8.4v 

Plug Gap: 0.46 to 0.51mm (0.018" to 0.020): Installation Torque: 7 to 8 ft-lbs

Specifications
Displacement: 20cm3        
Diameter × Stroke: 32mm×25mm 
Compression Ratio:  10.5:1  
Fuel 2C Gasoline:30:1 - 40:1 (30:1 for breakin, 40:1 quality synthetic thereafter)
Weight:  Main Engine - 660g; Muffler - 80g; Ignition device - 130g