The crankcase gasket for the MBX10 and MBX Mini Bikes can be hard to find It is a little but very necessary part and can be found here at Monster Scooter Parts The crankcase gasket for the MBX10 and MBX Mini Bikes can be hard to find. It is a little but very necessary part and can be found here at Monster Scooter Parts.This gasket may be compatible with other scooters or mini bikes as well. Please be sure to check the compatibility for a list of models.