I have a 2004 Yamaha 1200 XLT. It is running but a bit rough. Most of the time it has to be slightly choked to run at low speeds. It runs best at high speed when it is not choked at all. I replaced the plugs about two weeks ago and checked the gapping. It was off a bit so I adjusted but it doesn't run any better. My daughter took it out and I could hear it skipping or running rough from across the lake. Any ideas? Thanks in advance!