Specification:Short shaft: 40cmType: 4 stroke 4 horsepowerCapacity: 52ccTransmission ratio: 2.08 (27:13)The number of cylinders: 1Maximum speed: 4000-5000Maximum power: 4 HPShift position: clutch controlPackage volume: 95x40x30 cmIgnition system: CDICooling system: air coolingStarting method: Manual startRefueling: No. 93 gasolinePropeller size: 7 1/4X7-AThe maximum fuel consumption: 1.4 liters / hourRecommended Lubricant: 4 stroke lubricating oilMixing ratio: Pure gasolineTrim and tilt system: Manual TiltStart-In-Gear protection/clutch feature prohibits prop rotation while idlingEasy pull off engine cover with push button latch for instant motor accessTips:1. About the noise: all the gasoline machines are noisy, currently we did not test the decibel , but the noise is the same as the motorcycle, so it is a normal phenomenon2. The machine itself is lightweight, it can use on boat weight of 100kg or less , load-bearing 4 people, but the speed is certainly not the same when one person on it or 4 people on it . Customer who has high expectations on speed, please be noticed3. Necessary: you have to prepare a boat-motor stand or Hanging board on your boat.Cylinder Scoring is a serious damage, which caused by improper use and will cost you a lot of money to repair the motor. Don't do the following will avoid cylinder Scoring:1. start the motor on bank 2. use the motor when it stop coming out of waterEven if you want test the motor, it should be done in the river!When there is no water coming out from the motor, please stop using it immediately, then check the impeller of Water pump or check if the water outlet has been blocked.