This engine is not a toy , before staring the engine ,read the operators manual carefully ,if failure to do so may  result in personal injuries , DLE refuses any liability；Before each operation, check the engine mount ,propeller  and airframe carefully to ensure all engine screws and nuts is tight . Loctite(242,243) is strongly recommended  during the installation.
■CAUTION ： During the break-in period, it is recommended that the engine be installed  on the aircraft or a test stand with an appropriate shock absorber. Otherwise it is probable that vibration could rebound back to the engine and serious damages may occur during the break-in period. For your safety and the safety of others, please do not stand in front or in line with the propeller when the engine is running.