Yamaha WaveRunner Service Manual page 57

INSP
ADJ
IN
É 0
Ë
#1
#2
Ê
#3
#4
POWER UNIT
EX
1
180 360 540 720
Ë
Ë
Ë
4. Measure:
• Valve clearance
Out of specification → Adjust.
Valve clearance (cold):
Intake valve:
0.11–0.20 mm
(0.0043–0.0079 in)
Exhaust valve:
0.25–0.34 mm
(0.0098–0.0134 in)
Measurement steps:
• Turn the drive coupling counterclockwise,
and then check if cylinder #1 is at TDC of
the compression stroke with a dial gauge.
NOTE:
TDC on the compression stroke can be
found when the camshaft lobes are turned
away from each other.
• Measure the valve clearance with a thick-
ness gauge 1.
NOTE:
• If the valve clearance is incorrect, record
the measured reading.
• Measure the valve clearance in the follow-
ing sequence.
Valve clearance measuring sequence
Cylinder #1 → #2 → #4 → #3
È Bow side
• To measure the valve clearances of the
other cylinders, starting with cylinder #1
at TDC, turn the drive coupling counter-
clockwise as specified in the following
table.
É Degrees that the crankshaft is turned clock-
wise
Ê Cylinder
Ë Combustion cycle
Cylinder #2
Cylinder #4
Cylinder #3
3-11
E
180°
360°
540°