1984 Official Honda TRX200 Shop Manual, Page 195Get this manual
TRX200 Measure the master cylinder piston 0.0
SERVICE LIMIT: 12.645 mm (0.4978 in)
Check the primary and secondary cups for damage before assembly
MASTER CYLINDER ASSEMBLY
CAUTION
DIAPHRAGM
Keep the master cylinder pisconcylinder and sprilg as set: don'r substitute individual partsAssemble the master cylinderCoat all parts with clean brake fluid before assemblyInstall the spring and primary cup together Dip the piston cup in brake fluid before assemblyCAUTION