Yamaha YFM7FGPW Service Manual page 99

ADJUSTING THE VALVE CLEARANCE
1
3
4
1
2
c. Measure the valve clearance with a thick-
ness gauge 1.
Thickness gauge
90890-03079
Narrow gauge set
YM-34483
Out of specification → Adjust.
L LLL L LLL L L LLL L
8. 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.
c. Turn the adjusting screw 3 with the tappet
adjusting tool 4 until the specified valve
clearance is obtained.
Tappet adjusting tool
90890-01311
Valve adjuster 3 mm & 4 mm
YM-08035-A
d. Hold the adjusting screw to prevent it from
moving and tighten the locknut to the speci-
fied torque.
Locknut
14 Nm (1.4 m · kg, 10 ft · lb)
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
obtained.
L LLL L LLL L L LLL L
9. Install:
• timing mark accessing screw
• crankshaft end accessing screw
10.Install:
• spark plug
11.Connect:
• spark plug cap
3 - 18
CHK
ADJ
L LLL L L LLL L L LLL L LLL
M MMM M M MMM M M MMM M MMM
L LLL L L LLL L L LLL L LLL
6 Nm (0.6 m · kg, 4.3 ft · lb)
10 Nm (1.0 m · kg, 7.2 ft · lb)
13 Nm (1.3 m · kg, 9.4 ft · lb)