hey guys i have a yamaha blaster and when it is started and in neutral if i dont tap the gas a little it will turn off like there isnt enough rmp when its running idle

also i kinda notice it didnt shut off when the choke was pulled and the weather this happened in was in 70 80 and 85 so i doubt its anything with temperature???????????????????????????????? please help what i can do nto fix this problem

 

its a 2 stroke it does'nt just idle once u get it started hold it quater throttle for atleast a min then see if it idles.