Yamaha YBR125 Custom, Service Manual

Page: 73 / 218

ENG
Disassembly of engine
4.
5.
6.
Disassemble:
Air valve cover(intake)
:
Air valve cover ( exhaust)
Disassemble
Side cover of cylinder co v er
Timing adjustment
Make the mark “ ” on rotator aiming at the fixing needle
on crankcase cover.
3
******************************* ***********
Timing adjusting procedure
Rotate the crank counterclockwise with wrench.
******************************** **********
4 - 4
Make mark“ ” on rotator aiming at fixing needle b
on crankcase cover. When mark“ ”aiming at fixing
a
needle , the piston is on upper dead center (T , D , C ).
At the same time the calibration mark c of cam chain
gear should aim at calibration mark d on cylinder cover.
The swaying arms on both sides must form valve gap.
If there is no gap, rotate the crank counterclockwise to
meet above requirement.