Yamaha YZ 2019 Series, Owner'S Service Manual

Page: 97 / 398

ENGINE
3-9
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EAM30215
CHECKING THE COOLANT CIRCULATORY
SYSTEM FOR LEAKS
1. Check:
• Coolant level
2. Install:
• Radiator cap tester “1”
•
Radiator cap tester adapter “2”
3. Activate the tester to apply the test pressure.
NOTICE
ECA24270
• Do not apply such a high pressure as ex-
ceeds the test pressure.
• Make sure that a checkup after the cylinder
head gasket is replaced is made after 3 min-
utes of warm-up.
• Make sure that coolant is filled up to the up-
per level beforehand.
4. Check:
• Pressure value
No stay for 5 to 10 seconds at the test pres-
sure value

Correct.
•
Radiator
• Radiator hose connections
Coolant leaks

Correct or replace.
• Radiator hoses
Bulges

Replace.
WARNING
EWA19090
When the radiator cap tester is removed,
coolant will spout; therefore, cover it with a
cloth beforehand.
EAM30216
ADJUSTING THE CLUTCH LEVER FREE
PLAY
1. Check:
•
Clutch lever free play “a”
Out of specification

Regulate.
2. Adjust:
•
Clutch lever free play
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Handlebar side
a. Turn the adjuster “1” in direction “a” or “b” until
the specified clutch lever free play is ob-
tained.
Radiator cap tester
90890-01325
Mityvac cooling system tester kit
YU-24460-A
Radiator cap tester adapter
90890-01352
Pressure tester adapter
YU-33984
Test pressure value
196 kPa (1.96 kg/cm
2
, 27.9 psi)
Clutch lever free play
7.0–12.0 mm (0.28–0.47 in)
Direction “a”
Clutch lever free play is increased.
Direction “b”
Clutch lever free play is decreased.