The engine is a good buy for the price.With a few improvements the engine would be very good.The engine idle should be improved. currently tends to hunt not idle smoothly.The fuel tank filler fuel cap are not a good seal as fuel spills out of the tank. I believe the fuel tank filler orifice needs to be redesigned so that the tank filler orifice is raised to enable the fuel cap to seal correctly.There has been a great number of these engines sold and I am sure the manufacturer if told could improve this problem.I own 6 of these 6.5 engines fitted to different products and with the above suggested improvements I am confident the manufacturer would improve its sales.