Rotax 503 UL Aircraft engine , its duel carb 52 horsepower with electric start and NICE TO HAVE pull start , gearbox is 2:58 ratio and can be mounted up or down as same as engine can ,It is brand new never started came with never started Aircraft kit . plates on bottom of engine for shipping . The engine can be used in a Tractor or Pusher aircraft and can run upside down as needed . What you see in the picture is exactly what you will receive if you are the buyer , NOTE free shipping is at the Buy it now price only , In other words If i accept your lower offer you will be responsible for the shipping of YOUR CHOICE , Thanks for looking