Yamaha 2010 XMAX YP125R Service Manual page 134

c. Check that the cam lobes are positioned as
shown in the illustration.
d. Measure the valve clearance with a thickness
gauge "1".
Out of specification → Adjust.
1
L LLL L LLL L L LLL L
6. Adjust:
• Valve clearance
M MMM M MMM M M MMM M
a. Loosen the locknut "1".
b. Insert a thickness gauge "2" between the end
of the adjusting screw and the valve tip.
1
2
L LLL L L LLL L L LLL L
M MMM M M MMM M M MMM M
c. Turn the adjusting screw "3" in direction "a" or
"b" with the tappet adjusting tool "4" until the
specified valve clearance is obtained.
Direction "a"
Valve clearance is increased.
Direction "b"
Valve clearance is decreased.
d. Hold the adjusting screw to prevent it from
moving and tighten the locknut to specifica-
tion.
e. Measure the valve clearance again.
f. If the valve clearance is still out of specifica-
tion, repeat all of the valve clearance adjust-
ment steps until the specified clearance is
LLL
obtained.
L LLL L LLL L
7. Install:
MMM
• Timing mark accessing plug
(along with the O-ring
• Cylinder head cover gasket
• Cylinder head cover
• Spark plug
• Spark plug cap
3-7
ENGINE (YP125R)
Tappet adjusting tool
90890-01311
Six piece tappet set
YM-A5970
b
a
3
4
Locknut (valve clearance adjust-
ing screw)
7 Nm (0.7 m·kgf, 5.1 ft·lbf)
L LLL L L LLL L L LLL L
New
)
Timing mark accessing plug
8 Nm (0.8 m·kgf, 5.8 ft·lbf)
Cylinder head cover bolt
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
Spark plug
13 Nm (1.3 m·kgf, 9.4 ft·lbf)
L LLL L LLL
New