The MBP retaining system was designed to extend valve adjustment intervals by using a superior design to retain the closer shim on the valve stem.
- MBP Retainers are compatible with EMS Closer Shims and Ducati OEM Closer Shims
- MBP Retainers are available for 7 mm and 8 mm valve stems
- 8 MBP retainers are needed for 2V bikes
- 16 MBP retainers are needed for 4V bikes
- Modified Opener shims are required when MBP Retainers are used on all 4V bikes.
- There are two 7 mm MBP retainer designs. One is for the early 4V and all 2V- 7mm bikes, the other is for all later 4V bikes. The later 4V bikes require a slightly smaller MBP retainer (about .0005 in.) to fit properly.