The rear drive belt inner tooth surface has a thin coating of mold release. During initial operation, this coating will wear as it is burnished into the belt fabric. This is a normal condition and not an indication of excessive belt wear.
Belt tension is maintained by a tensioner pulley. No belt adjustment is required. Refer to Maintenance Scheduling → Regular Service Intervals: Buell Models → Regular Service Intervals: 2009 Buell 1125 Models for inspection intervals.