38:1 is alot of oil. The Yamaha dealer told me to break mine in at 32:1 then just run 40:1 in it. I buy Maxima Super M oil and dump all of it into 5 gallons of gas and it comes out exactly 40:1
run 32:1. I recomend Castro Maxima 927 Oil. there are also low smoke oils out there so that may cause your blaster not to smoke as much. my brothers blaster smokes more than mine and we use the same gas.