Checking The Decompression System; Checking The Vva Solenoid; Installing The Cylinder Head - Yamaha N MAX GPD150-A 2015 Service Manual

e. Install the timing chain tensioner plug.
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EAS30280

CHECKING THE DECOMPRESSION SYSTEM

1. Check:
• Decompression system
TIP
• Check that the decompression lever moves
smoothly.
• Check that the operating range "a" of the de-
compression lever is the same as the range
shown in the illustration.
a. 20.88°
EAS31624

CHECKING THE VVA SOLENOID

1. Check:
• VVA (variable valve actuator) solenoid "1"
Cracks/damage → Replace.
1
EAS30282

INSTALLING THE CYLINDER HEAD

1. Tighten:
• Cylinder head nuts "1"
• Cylinder head bolts "2"
Cylinder head nut
24 Nm (2.4 m·kgf, 17 ft·lbf)
Cylinder head bolt
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
TIP
• Lubricate the cylinder head nuts and washers
with molybdenum disulfide grease.
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a
• Tighten the cylinder head nuts and bolts in the
proper tightening sequence as shown and
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torque them in two stages.
1
2
2. Install:
• Decompression cam "1"
• Camshaft sprocket "2"
• Timing chain
• Camshaft sprocket bolt
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a. Turn the crankshaft clockwise.
b. Align the "I" mark "a" on the AC magneto rotor
with the match mark "b" on the right crank-
case.
c. Install the decompression cam.
d. Install the timing chain onto the camshaft
sprocket, then the camshaft sprocket onto
the camshaft, and then finger tighten the
camshaft sprocket bolt.
ECA20600
NOTICE
Do not turn the crankshaft when installing
the camshaft sprocket to avoid damage or
improper valve timing.
TIP
• Fit the pin on the decompression cam into the
slot "c" in the decompression lever on the cam-
shaft sprocket.
• Align the "I" mark "d" on the camshaft sprocket
with the match mark "e" on the camshaft stop-
per plate.
5-15
CYLINDER HEAD
3
1
6 5
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×
4
4
1
×
2
2
2
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b
a