Being hard of hearing don't help, but I seem to have a rattle sound from the left side of the bike at about 2000 rpm. Just a steady rpm no gas added or letting of the gas. Only seems to show up in first gear. It might be their in other gears but with my hearing I can't tell. I ride a 2010 UC 35K miles SE 255 cams and 103 upgrade kit, TTS master tune,Fullsac headers K&N air filter stage one kit. The bike runs great but I hear this noise at this rpm range. Don't know if I should be worried or just ride? Mobile one V-twin in the motor,spectro six speed in the primary and their trans lube in the trans.