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JC Area 51 Petrol Engine 　Engine Specification: 　　Engine type ： 2—Stroke gasoline engine 　　Displacement(cylinder volume) ： 51cc 　　Bore × Stroke: 44mm × 35mm 　　park plug: NGK BPMR6 　　Bearing: NSK 6003,6002 　　Carburetor: Walbro special-designing vacuum pump diaphragm type duplex needle carburetor 　　Max power ： 5.2hp/7200rpm 　　Practical running speed ： 1400 － 9000rpm 　　Net Weight ： 1700g (including CDI and muffler) 　　Ignition system ： CDI battery ignition (battery voltage: 4.8v—6v) 　　 Oil ratio ： 25-30:1 used during the break-in (the initial 2 working hours); 35-40:1 used after the break-in. 　　 Propeller dimension 22*10-24*8