Page 94 of 148
8-16
1
2
3
4
5
6
78
9
10
11
4. Remove the radiator cap.5. Remove the coolant reservoir cap.
1. Coolant drain bolt
2. Gasket
12
1
1. Radiator cap
1
Page 95 of 148
8-17
1
2
3
4
5
6
78
9
10
11
6. Disconnect the hose on the coolant reservoir
side and drain the coolant from the coolant
reservoir.7. After draining the coolant, thoroughly flush the
cooling system with clean tap water.
8. Install the coolant drain bolts and their new
gasket, and then tighten the bolts to the spec-
ified torque.
9. Connect the coolant reservoir hose.
10. Pour the recommended coolant into the reser-
1. Coolant reservoir cap
1
1. Coolant reservoir hose
2. Coolant reservoir
Tightening torque:
Coolant drain bolt:
14 Nm (1.4 m·kgf, 10 ft·lbf)
1
2
Page 96 of 148

8-18
1
2
3
4
5
6
78
9
10
11
voir to the maximum level mark, and then in-
stall the reservoir cap.
NOTICE:
Mix
antifreeze with distilled water only. Howev-
er, if distilled water is not available, soft
water may be used for refilling. Do not use
hard water or salt water since they are
harmful to the engine.
[ECB00991]
11. Pour the recommended coolant into the radia-
tor until it is full.
12. Install the radiator cap, start the engine, let it
idle for several minutes, and then turn it off.
13. Remove the radiator cap to check the coolant
level in the radiator. If it is low, add sufficientcoolant until it reaches the top of the radiator,
and then install the radiator cap.
14. Start the engine, and then check for coolant
leakage.
TIP
If any leakage is found, have a Yamaha dealer
check the cooling system.
15. Install the radiator cover by installing the
screws.
EBU23624
Cleaning the air filter element
The air filter element should be cleaned at the in-
tervals specified in the periodic maintenance and
lubrication chart. Clean or, if necessary, replace
the air filter element more frequently if you are
riding in unusually wet or dusty areas.
TIP
There is a check hose at the bottom of the air filter
case. If dust or water collects in this hose, empty
the hose and clean the air filter element and air fil-
ter case. Antifreeze/water mixture ratio:
1:1
Recommended antifreeze:
High-quality ethylene glycol antifreeze con-
taining corrosion inhibitors for aluminum en-
gines
Coolant quantity:
Radiator capacity (including all routes):
1.50 L (1.59 US qt, 1.32 Imp.qt)
Coolant reservoir capacity (up to the maxi-
mum level mark):
0.28 L (0.30 US qt, 0.25 Imp.qt)
Page 135 of 148
8-57
1
2
3
4
5
6
78
9
10
11
Engine overheating
WARNING
EWB02290
Wait for the engine and radiator to cool before removing the radiator cap. You could be burned by
hot fluid and steam blown out under pressure. Always put a thick rag over the cap when opening.
Allow any remaining pressure to escape before completely removing the cap.
TIP
If coolant is not available, tap water can be temporarily used instead, provided that it is changed to the rec-
ommended coolant as soon as possible.
Wait until the
engine has cooled.
Check the coolant level in the
reservoir and radiator.
The coolant level
is OK.The coolant level is low.
Check the cooling system
for leakage.
Have a Yamaha dealer check
and repair the cooling system.Add coolant. (See TIP.)
Start the engine. If the engine overheats again, have a
Yamaha dealer check and repair the cooling system.
There is
leakage.
There is
no leakage.
Page 140 of 148

10-2
1
2
3
4
5
6
7
8
910
11
Cooling system:
Coolant reservoir capacity (up to the maximum level mark):
0.28 L (0.30 US qt, 0.25 Imp.qt)
Radiator capacity (including all routes):
1.50 L (1.59 US qt, 1.32 Imp.qt)
Air filter:
Air filter element:
Wet element
Fuel:
Recommended fuel:
Premium unleaded gasoline only
Fuel tank capacity:
12.0 L (3.17 US gal, 2.64 Imp.gal)
Fuel reserve amount:
2.5 L (0.66 US gal, 0.55 Imp.gal)
Carburetor:
Type
×
quantity:
VM26SS x 2
Spark plug (s):
Manufacturer/model:
NGK/BR8ES
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)
Clutch:
Clutch type:
Wet, multiple-disc
Transmission:
Primary reduction system:
Helical gear
Primary reduction ratio:
66/23 (2.869)Secondary reduction system:
Chain drive
Secondary reduction ratio:
41/14 (2.929)
Transmission type:
Constant mesh 6-speed
Operation:
Left foot operation
1st:
32/13 (2.461)
2nd:
29/16 (1.812)
3rd:
27/18 (1.500)
4th:
25/20 (1.250)
5th:
23/22 (1.045)
6th:
21/24 (0.875)
Chassis:
Frame type:
Steel tube frame
Caster angle:
9.0 °
Trail:
40.0 mm (1.57 in)
Front tire:
Type:
Tubeless
Size:
AT21 x 7-10
Page 145 of 148

INDEX
A
Accessories and loading ................................................ 6-6
Air filter element, cleaning ............................................ 8-18
B
Brake and clutch levers, checking and lubricating ....... 8-46
Brake fluid, changing.................................................... 8-37
Brake fluid level, checking............................................ 8-36
Brake lever ..................................................................... 4-4
Brake lever free play, checking the front ...................... 8-38
Brake light switches ..................................................... 8-41
Brake pads, checking the front and rear ...................... 8-35
Brake pedal .................................................................... 4-5
Brake pedal, checking and lubricating ......................... 8-46
Brake pedal height, checking ....................................... 8-38
Brakes .......................................................................... 8-34
Brakes, front and rear .................................................... 5-3
C
Cables, checking and lubricating ................................. 8-45
Carburetor settings, changing ...................................... 8-23
Chassis fasteners........................................................... 5-6
Cleaning ......................................................................... 9-1
Clutch lever .................................................................... 4-4
Clutch lever free play, adjusting ................................... 8-41
Coolant ................................................................. 5-3
,
8-13
D
Drive chain ..................................................................... 5-4
Drive chain, lubricating ................................................. 8-45
Drive chain slack .......................................................... 8-43
E
Engine break-in .............................................................. 6-4
Engine, cold start ........................................................... 6-1
Engine idling speed ...................................................... 8-32
Engine, starting a warm ................................................. 6-2
Engine stop switch ......................................................... 4-2
F
Fuel ................................................................................ 4-8
Fuel and 2-stroke engine oil mixing ratio ....................... 5-3
Fuel cock ........................................................................ 4-9
Fuel tank cap.................................................................. 4-7
H
Handlebar switches ........................................................ 4-2
Headlight beam, adjusting............................................ 8-51
Headlight bulb, replacing.............................................. 8-49
I
Identification numbers .................................................. 11-1
Instruments, lights and switches .................................... 5-7
K
Kickstarter ...................................................................... 4-7
L
Label locations ............................................................... 1-1
Light switch .................................................................... 4-2
M
Main switch .................................................................... 4-1
Maintenance and lubrication chart ................................. 8-5
Maintenance chart, emission control system ................. 8-3
Model label ................................................................... 11-2