RRD rocker arms for 139FMB-B engine on motorcycle 50 4t MASH FIFTY, A RC HIVE ...

Here is the RRD valve rocker arm(s) for 139FMB-B engine on motorcycle 50 4t MASH FIFTY, A RC HIVE ...

If your timing chain has broken or you are out of stock, then it will be necessary to change the rocker arm, which acts as a buffer between the piston and the valves if the breakage occurs.

Mounts on:

ENGINE 139FMB-B E4

MASH FIFTY E4

A RC HIVE 50CC E4 ...