I am looking at buying a left over boat with a 115 hp yamaha 2 stroke ,it is a 2000. any pro's or cons with these motors ,and should there be anything to look out for since it has been sitting fo a while, it will have a 2 year warrentee on it.and the motor has been stored in there showroom .they are a large respectable marine dealer in my area Do i need to mix the oil and gas or does it have a resivoir that mixes it ??? thanks