Im real glad I found this forum. I'm anxious to learn and share. I just picked up a 2007 Yamaha V Star 1300 Tourer and I'm trying to determine the best mod for a common problem on these: O2 sensor, ECU flash, or an FMS. Sloppy shifting with vibration at low rpm. Feels like belt is slipping. Noisy going into 1st as well. Clunk.