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7. Adjust:
• Valve clearance
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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" in direction "a" or "b" until the
specified valve clearance is obtained.
b
a
4
Direction "a"
Valve clearance is increased.
Direction "b"
Valve clearance is decreased.
Tappet adjusting tool
90890-01311
Six piece tappet set
YM-A5970
1
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3
1
2
• Hold the adjusting screw to prevent it from
moving and tighten the locknut to specifica-
tion.
Locknut
14 Nm (1.4 m·kg, 10 ft·lb)
d. Measure the valve clearance again.
e. 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.
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8. Install:
• Timing mark accessing screw
• Crankshaft end accessing screw
• Spark plug
Timing mark accessing screw
2 Nm (0.2 m·kg, 1.4 ft·lb)
Crankshaft end accessing screw
2 Nm (0.2 m·kg, 1.4 ft·lb)
Spark plug
13 Nm (1.3 m·kg, 9.4 ft·lb)
9. Connect:
• Spark plug cap
10.Install:
• O-ring
New
• Camshaft sprocket cover
• O-ring "1"
New
• Intake tappet cover
• O-ring
New
• Exhaust tappet cover
Camshaft sprocket cover bolt
10 Nm (1.0 m·kg, 7.2 ft·lb)
Intake tappet cover bolt
10 Nm (1.0 m·kg, 7.2 ft·lb)
Exhaust tappet cover bolt
10 Nm (1.0 m·kg, 7.2 ft·lb)
1
New
11.Install:
• Fuel tank
3-5
ENGINE
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Troubleshooting
