Yamaha TZ125M1 Owner's Service Manual page 88

IGNITION TIMING CHECK
2. Attach:
• Dial gauge 1
• Dial gauge stand 2
C
Dial gauge:
YU-03097/90890-01252
Stand:
YU-01256
3. Rotate the magneto rotor 1 until the piston
reaches top dead center (TDC). When this
happens, the needle on the dial gauge will
stop and reverse directions even though
the rotor is being turned in the same direc-
tion.
4. Set the dial gauge to zero at TDC.
a
5. From TDC, rotate the rotor clockwise until
the dial gauge indicates that the piston is at
a specified distance from TDC.
Ignition timing (B.T.D.C.):
2.3 mm (0.091 in)
6. Check:
• Ignition timing
Punch mark a on rotor should be aligned
with punch mark b on pick-up coil.
Not aligned ≥ Adjust.
7. Adjust:
• Ignition timing
T
Adjustment steps:
• Loosen the screws (pick-up coil) 1.
• Align the punch marks by moving the pick-
up coil 2.
• Tighten the screws (pick-up coil).
Screw (pick-up coil):
3-38
INSP
ADJ
2 Nm (0.2 m•kg, 1.4 ft•lb)