Checking The Cooling System; Changing The Coolant - Yamaha YZF-R25 Service Manual

TIP
Before checking the coolant level, wait a few
minutes until it settles.
EAS30812

CHECKING THE COOLING SYSTEM

1. Check:
• Radiator "1"
• Radiator inlet hose "2"
• Radiator outlet hose "3"
• Thermostat cover "4"
• Thermostat "5"
Cracks/damage → Replace.
Refer to "RADIATOR" on page 6-1, "THER-
MOSTAT" on page 6-4 and "WATER PUMP"
on page 6-6.
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EAS30813

CHANGING THE COOLANT

1. Remove:
• Side panels
Refer to "GENERAL CHASSIS (2)" on page
4-3.
• Front side cowling assembly (left)
Refer to "GENERAL CHASSIS (3)" on page
4-5.
2. Disconnect:
• Front turn signal light connector (left)
Refer to "GENERAL CHASSIS (3)" on page
4-5.
3. Remove:
• Radiator cap "1"
EWA13030
WARNING
A hot radiator is under pressure. Therefore,
do not remove the radiator cap when the en-
gine is hot. Scalding hot fluid and steam may
be blown out, which could cause serious in-
jury. When the engine has cooled, open the
radiator cap as follows:
Place a thick rag or a towel over the radiator
cap and slowly turn the radiator cap counter-
clockwise toward the detent to allow any re-
sidual pressure to escape. When the hissing
3
5
4
2
PERIODIC MAINTENANCE
sound has stopped, press down on the radi-
ator cap and turn it counterclockwise to re-
move.
4. Remove:
• Coolant reservoir cover "1"
• Coolant reservoir cap "2"
• Coolant reservoir
Refer to "RADIATOR" on page 6-1.
2
5. Drain:
• Coolant
(from the coolant reservoir)
6. Remove:
• Coolant drain bolt "1"
(along with the copper washer)
3-24
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