Page 34 of 148

4-9
1
2
34
5
6
7
8
9
10
11
3. Wipe up any spilled fuel immediately.
NOTICE:
Immediately wipe off spilled fuel
with a clean, dry, soft cloth, since fuel may
deteriorate painted surfaces or plastic
parts.
[ECB00981]
4. Turn the fuel tank cap fully clockwise to make
sure it is securely closed.
WARNING
EWB02531
Gasoline is poisonous and can cause injury or
death. Handle gasoline with care. Never siphon
gasoline by mouth. If you should swallow
some gasoline or inhale a lot of gasoline vapor,
or get some gasoline in your eyes, see your
doctor immediately. If gasoline spills on your
skin, wash with soap and water. If gasoline
spills on your clothing, change your clothes.
NOTICE
ECB00060
Use only unleaded gasoline. The use of leaded
gasoline will cause severe damage to internal
engine parts, such as the piston rings, as well
as to the exhaust system.
Your Yamaha engine has been designed to use
premium unleaded gasoline with a research oc-
tane number of 95 or higher. If knocking (or ping-
ing) occurs, use a gasoline of a different brand.
Use of unleaded fuel will extend spark plug life and
reduce maintenance costs.
EBU18830
Fuel cock
The fuel cock supplies fuel from the tank to the car-
buretors while also filtering it.
The fuel cock lever positions are explained as fol-
lows and shown in the illustrations. Recommended fuel:
PREMIUM UNLEADED GASOLINE ONLY
For Europe: PREMIUM UNLEADED GASO-
LINE ONLY with a research octane number
of 95 or higher.
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)
Page 104 of 148
8-26
1
2
3
4
5
6
78
9
10
11
6. Remove the fuel tank by removing the bolts.
7. Remove the air filter case cover by unhooking
the holders.
1. Fuel hose
1
1. Fuel tank
2. Bolt
1
2
22
2
Page 110 of 148

8-32
1
2
3
4
5
6
78
9
10
11
5. Move the throttle lever a few times and re-
check the position.
6. Install the fuel tank, side cover, radiator cover
and air filter case cover.
7. Connect the fuel hose to the fuel cock.
8. Install the seat.
EBU24020
Adjusting the engine idling speed
The engine idling speed must be checked and, if
necessary, adjusted as follows at the intervals
specified in the periodic maintenance and lubrica-tion chart.
TIP
A diagnostic tachometer is needed to make this
adjustment.
The carburetor synchronization and the throttle
cable free play must be checked, and adjusted if
necessary, before adjusting the engine idling
speed.
1. Start the engine and warm it up.
TIP
The engine is warm when it quickly responds to the
throttle.
2. Attach the tachometer to the spark plug lead.
3. Turn in both pilot air screws until they lightly
seat.
4. Turn out both pilot air screws to specification.
(See the “Changing the carburetor settings”
section on the page 8-23.)
1. Adjusting nut
2. Locknut
1
2
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