Yanmar diesel engine 10hp. Air cooled. Includes 90 degree gear box which also has a straight drive, I think it is one to one ratio.electric and pull start. Also owner manual. All in exelent working condition less than 200 hours. This is the genuine yanmar not a Chinese knock off. These sell for over $5000.00 without the gearbox a bargain for some one here. Please note this is not a repeat listing I had two of these exactly the same 1 sold so 1 left.