Compact size, additional accessories are required to this product: kit, plug, ESC, simulator, 11.1v T plug battery. 7.4vT plug battery(The above products are not included in this product ); these accessories are not exclusive accessories, are universal products, others accessories for similar products can also be used in this productSpeed: 2200-10500rpm, Piston stroke: 17.00mm; Cylinder diameter: 16.60mm Displacement: 3.5cc, : 0.5psIf you gasoline above No.92, the gasoline needs to be proportioned to the oil. The oil is 2T (2-stroke engine oil, the type used for ordinary motorcycles), which is adjusted from 1:25 to 1:30. A litre of petrol needs 40ml of oil (not included)Operation : The ignition part is 7.4v battery connected to the kit and then connected to the plug and then connected to the engine. The part is the tank connecting the oil pipe and the engine is connected. The starting part is the kit and the kit is equipped with the Hall sensor and the engineThe product is suitable for 1:10, 1:12, 1:14 scale or ships and other equipment, also can be used for classroom display, as teaching. Notes: Please it carefully during operation. Do not touch the motor fan with your hands to avoid scratching.size: 99.2 x 86.6 x 97.8mmMaterial: Aluminum alloy + alloy steelcolour: blackPackage Contents:1 x Engine main body1 x motor + ten-tooth adapter1 x Exhaust pipe7 x fan blades1 x belt1 x Motor bracket gasket2 x Motor fixing screws1 x Hall sensor bracket1 x Hall transmission bracket sleeve1 x Sensing bracket fixing screw1 x Chinese-English InstructionOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.