Yamaha YFM70RY, Service Manual

Page: 100 / 374

ENGINE
3-17
d. Insert the tailpipe into the muffler and align
the bolt holes.
e. Insert the bolt and tighten it.
f. Remove the purging bolt “3”.
g. Start the engine and rev it up approximately
twenty times while momentarily creating ex-
haust system back pressure by blocking the
end of the muffler with a shop towel.
h. Stop the engine and allow the exhaust pipe to
cool.
i. Install the purging bolt “3” and tighten it.
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EAS21110
CHECKING THE COOLANT LEVEL
1. Place the vehicle on a level surface.
2. Check:
• Coolant level
The coolant level should be between the
maximum level mark “a” and minimum level
mark “b”.
Below the minimum level mark
→
Add the
recommended coolant to the proper level.
NOTICE
ECA13470
• Adding water instead of coolant lowers the
antifreeze content of the coolant. If water is
used instead of coolant check, and if nec-
essary, correct the antifreeze concentra-
tion of the coolant.
• Use only distilled water. However, if dis-
tilled water is not available, soft water may
be used.
3. Start the engine, warm it up for several min-
utes, and then turn it off.
4. Check:
• Coolant level
TIP
Before checking the coolant level, wait a few
minutes until it settles.
EAS21120
CHECKING THE COOLING SYSTEM
1. Remove:
• Seat
• Front fender
Refer to “GENERAL CHASSIS” on page 4-1.
2. Check:
• Radiator “1”
• Radiator outlet hose “2”
• Radiator inlet hose “3”
• Water pump assembly “4”
• Water jacket inlet joint “5”
• Water jacket outlet hose “6”
Cracks/damage
→
Replace.
Refer to “RADIATOR” on page 6-1, “THER-
MOSTAT” on page 6-3 and “WATER PUMP”
on page 6-5.
T
R
.
.
Spark arrester bolt
8 Nm (0.8 m·kg, 5.8 ft·lb)
T
R
.
.
Purging bolt
27 Nm (2.7 m·kg, 19 ft·lb)
3
Recommended antifreeze
High-quality ethylene glycol anti-
freeze containing corrosion in-
hibitors for aluminum engines
Mixing ratio
1:1 (antifreeze:water)
b
a