I have a 1990 FXRS and I have noticed a vibration metal to metal sound especially when rolling off the throttle or hard braking, What could be the cause of this, It has run flawlessly for 10,000 mi. since the replacement engine was installed an S&S 96 in motor.
FXR best motorcycles that Harley Davidson ever built!!Designed with a lot of input by Eric Buell, the FXR had the lightest weight and stiffest frame of any big twin. The computer-designed, all-welded frame had a massive box-section backbone, thicker diameter tubing, and massive gusseting around the steering head. The result was the stiffest frame Harley ever produced!!!FXR forever!!