Can i use 20 w 50 oil in it i cant find 20 w 40 if not that what else kind can i use?

You can use any oil that is JASO MA certified motorcycle oil. 10w-40 for cold climate/year round. 20w-50 for warm climate/touring. Automotive oils use different additives and may cause scoring in certain types of cam bearings. Do not use any oil that says " Energy Conserving " on the label . It will shorten the life of your wet clutch and transmission gears. If you choose Synthetic oils, they will help your bike run cooler and shift easier. Shell Rotella T ($12 a gallon) and Rotella T Synthetic 15w-40 ($22 a gallon) are inexpensive JASO MA oils. In most Yamaha street bikes you will need between 3 and 4 quarts of oil, an aluminum drain plug washer, and a filter. Pour in 3 quarts , run the motor, and check the oil level . Top up as needed.