Checking The Timing Chain Tensioner; Checking The Decompression System; Installing The Camshafts - Yamaha XSR MTM690 2016 Service Manual

EAS30266

CHECKING THE TIMING CHAIN TENSIONER

1. Check:
• Timing chain tensioner
Cracks/damage/rough movement → Re-
place.
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a. Lightly press the timing chain tensioner rod
into the timing chain tensioner housing by
hand.
TIP
While pressing the timing chain tensioner rod,
wind it counterclockwise with a hexagon wrench
"1" (Parts No.: 1WS-12228-00) until it stops.
b. Make sure that the timing chain tensioner rod
moves in and out of the timing chain tension-
er housing smoothly. If there is rough move-
ment, replace the timing chain tensioner.
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EAS30267

CHECKING THE DECOMPRESSION SYSTEM

1. Check:
• Decompression system
TIP
• Check that the decompressor lever pins "1"
projects from the camshaft.
• Check that the decompressor cams "2" and de-
compressor lever pins "1" moves smoothly.
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1
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2
EAS30269

INSTALLING THE CAMSHAFTS

1. Align:
• Mark "a" on the generator rotor
(with the slot "b" in the generator rotor cover)
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a. Turn the crankshaft counterclockwise.
b. When piston #1 is at TDC, align the TDC
mark "a" on the generator rotor with the slot
"b" in the generator rotor cover.
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2. Install:
• Intake camshaft sprocket "1"
ECA19980
NOTICE
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Be sure to tighten the camshaft sprocket
bolts to the specified torque to avoid the
possibility of the bolts coming loose and
damaging the engine.
TIP
• Make sure that the marks "a" on the intake
camshaft sprocket are aligned with cam lobe
#1 "b" as shown in the illustration.
• While holding the intake camshaft sprocket
with the rotor holding tool "2", tighten the intake
camshaft sprocket bolts in the proper tighten-
ing sequence as shown.
5-18
CAMSHAFTS
2
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Intake camshaft sprocket bolt
24 Nm (2.4 m·kgf, 17 ft·lbf)
1
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b
a
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