I just swapped the front sprocket for 1 tooth less, and it helped, but my Yamaha dealer went to the extra effort of calling Yamaha and they told him that they have some special mod in the electrical system that will do somthing to the map and give more low end power. i haven't seen the schematics yet as they were going to fax it to him. Anyone hear of this? Should I let him do it? Keep in mind I already have a powercomander.