Bought a used 2012 Dvx 300, it will start instantly no matter how cold it is with the choke (manual cable choke) but after about a minute it will not idle no matter where you set the choke. After about 10 minutes of riding with engine up to full temp it will idle fine. What could be the problem. Other than that it works great, lots of power. Tried new plug with no difference and drained carb bowl thinking might have water but no change.