1984 Official Honda TRX200 Shop Manual, Page 126Get this manual
SUBTRANSMISSIONOUTPUT GEAR
Check the reverse idler shaft and gear for weak or damage Measure the I.Dof the reverse idle gear
SERVICE LIMIT: 15.068 mm (0.5932 in)
Measure the .0 of the reverse idler shaft
SERVICE LIMIT: 14.916 mm (0.5872 in)