I just bought my trx june of 2010. I didnt know what kind of gas to put in it so i ran 87. well then i was told that 87 is to lean so i added octane booster. I then noticed it was running different so i drained the fuel and changed the spark plug and started running 91 octane becasue thats all i can get where i live. Its not as throttle responsive as it was when i got it. You can be at idle and hit the gas and it cuts out. its more like when i hit the gas it stops then goes. idk if it is just me thinking to much about it or what but i would like to know if anybody else ran into this problem. And also, what should i run in my stock 700xx?