I just bought a used 2008 model and need to know what is the stock carburetor needle size for this model year, and what needle sizes are recommended for different altitudes. I live in Denver CO, but have plans to do a long off road trip with elevations from 2000 to 12,000 ft, and I'm thinking of taking various needle sizes with me. Currently it has a 125 in it. I hope someone can help out so I'm not stuck at the top of a mountain or overheating in the desert with no one around. Also, where can I buy different size needles? I've searched online and can only find whatever is stock, and they don't give a size. Are there other adjustments I can make in the field that aren't too complicated? I'm fairly mechanical but new to the TW, and motorcycle maintenance, but not afraid to try. Thanks in advance for any help!