Replacement chain tensioner assembly for the Monster Moto / Mega Moto Cassic 105cc, MM-B80 80cc, Motovox MBX10 and MBX11 mini bikes. This chain tensioner assembly will also work on the Baja Doodlebug.
This chain tensioner is 43.7mm wide (edge-to-edge when facing the bearing) and 33.35 mm deep (front to back when facing the bearing). The bearing is a 608Z bearing, with an inner diameter of 8mm.