My brother's bike. 1998 Road Glide, stage 2 engine, S&S Super E carb, 24000 miles. Started making a chirping-squeaking sound. Most pronounced when giving more throttle at lower RPM's. Does not happen at a constant speed or accelerating at a higher RPM. Makes it more when warmed up. Seems like it may be coming from the carb area and may be a whistling instead of metal on metal contact. Is getting worse.