The X-38cc-R Pro gasoline engine from EPHIL is designed for fixed-wing remote-controlled aircraft.
It features a 38cc displacement, producing 4.2 HP with a speed range of 1800-7300 RPM. It has a 39mm bore, 32.5mm stroke, and a 9:1 compression ratio, using a CM6 Iridium spark plug and electronic ignition.
The engine's total weight, including all components, is 1542.5g. It also includes a Walbro carburetor, rear-type muffler, and a high-efficiency electric starter
 

Model: X-38cc-R Pro

Displacement: 38cc (2.33 cu in)

Performance: 4.2HP

Speed Range: 1800-7300 RPM (Test Propeller-20*9)

Bore: 39mm (1.54 in)

Stroke: 32.5mm (1.28 in)

Static Thrust: 10.5 kg @ 100 m ALT (23.1 lb @ 328 ft ALT)

Static Thrust: 8.5 kg @ 1800 m ALT (18.7 lb @ 5900 ft ALT)

Compression ratio: 9:1

Lubrication ratio: 30:1 (Fuel: 2-Stroke Motor Oil)

Ignition Voltage: 6-14 V

Spark Plug Type: CM6 Iridium Spark Plug

Recommended Propeller: 19x8; 19x10; 20x8; 20x10

Weight of Main Engine: 1216g

Weight of Muffler Set: 73g

Weight of Aluminum Standoffs Set: 100g

Weight of Spark Plug: 13.5g

Weight of CDI (Ignition): 104g

Weight of Starter: 109g

Weight of ESC: 36g

Total Weight: 1542.5g (3.4 lb)

Manula HERE