I can't say for 100% certain because i haven't messed with the carb on my 04 1300c but if it's anything like a dirtbike (which i imagine it's exactly the same), you just need to adjust your idle (Air/Fuel mixture). I just did a quick search and found a video that will show you how to do this as i had no idea that they conveniently put the knob under the air intake box. In my experience with dirtbikes, this just means that the AF mixture is either too low or too high, most likely too low because too high makes the bike idle very high. Follow the vid and this should fix your issue. Adjusting Idle Speed on Honda VTX 1300 - Bing video Hopefully. Good luck.