Checking The Radiator - Yamaha 2004 YP400 Service Manual

RADIATOR
EAS00455

CHECKING THE RADIATOR

1. Check:
• radiator fins
Obstruction → Clean.
Apply compressed air to the rear of the radi-
ator.
Damage → Repair or replace.
NOTE:
_
Straighten any flattened fins with a thin, flat-
head screwdriver.
2. Check:
• radiator inlet hose
• radiator outlet hose
• radiator filler hose
• coolant reservoir hose
• radiator pipe assembly
Cracks/damage → Replace.
3. Measure:
• radiator cap opening pressure
Below the specified pressure → Replace
the radiator cap.
Radiator cap opening pressure
110.0 ~ 140.0 kPa
(1.10 ~ 1.40 kg/cm
15.6 ~ 19.9 psi)
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a. Install the radiator cap tester 1 and radiator
cap tester adapter 2 to the radiator cap 3.
Radiator cap tester
90890-01325, YU-24460-01
Radiator cap tester adapter
90890-01352, YU-33984
b. Apply the specified pressure for ten sec-
onds and make sure there is no drop in
pressure.
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4. Check:
• radiator fan motor
Damage → Replace.
Malfunction → Check and repair.
Refer to "COOLING SYSTEM" in chapter 8.
6 - 2
COOL
2
,
M M MMM M M MMM M
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