I am running this jetting because the bike ran like crap after i installed the exhaust. So i took it to the yam dealer and had them put it on the gas tester to see where i was at and that us how I ended up with a 50 pilot and a 185 main. I have a friend that dynoed his bike with u4 mixed and straight and the diference was minimal so i dont see the point in running it straight when you can make 10 gallons out of one can when the bike runs pretty mutch the same.I have alwaise ran race gas in my bikes for consistancy reasons i may not need it but i am going to run it no matter what. I would never run straight pump gas in my bike but if you want to put the garden hose in your $8000.00 bike go right ahead. Does anyone else understand this rational? You will destroy your motor running 112 octane not to mention the seals in your carb. Your jetting seems strange to me also - You may want to pm James Dean for some assistance....I do not know what the hell a gas tester even is - so i may be way off - just trying to help.