I bought a brand new 2007 honda 400ex recently. I have ridden it about 4 times. The first three times it ran perfect. The next time it didnt. It wont idle without the choke being on even after being warmed up and it wont run properly unless the choke is fully on. If I put it at half choke then it runs and idles fine at half throttle but if I go full throttle it bogs down and almost dies. It ran fine one day then the next this happened. I have no idea what it could be.