Page 22 of 91

INSTRUMENT AND CONTROL FUNCTIONS
3-8
3
EAU00185
CAUTION:@ Always wipe off spilled fuel immedi-
ately with a dry and clean soft cloth.
Fuel may deteriorate painted surfac-
es or plastic parts. @
EAU00191
NOTE:@ If knocking or pinging occurs, use a dif-
ferent brand of gasoline or higher oc-
tane grade. @
EAU02969
Fuel cockThe fuel cock supplies fuel from the
tank to the carburetors while filtering it
also.
The fuel cock has three positions,
which should be set as shown in the il-
lustrations.
OFF
With the fuel cock in this position, fuel
will not flow. Always set the fuel cock to
this position when the engine is not
running.ON
With the fuel cock in this position, fuel
flows to the carburetors. Set the fuel
cock to this position when starting the
engine and while riding. Recommended fuel:
Regular unleaded gasoline with a
research octane number of 91 or
higher.
Fuel tank capacity:
Total:
18 L
Reserve:
3.5 L1. Pointed end positioned over “OFF”OFF: closed position
1. Pointed end positioned over “ON”ON: normal position
E_4YP_Functions.fm Page 8 Wednesday, October 6, 1999 10:03 AM
Page 23 of 91

INSTRUMENT AND CONTROL FUNCTIONS
3-9
3
RES
This indicates reserve. If you run out of
fuel while riding, set the fuel cock to this
position. Fill the tank at the first oppor-
tunity. Be sure to set the fuel cock back
to “ON” after refueling!
EAU03032
Starter (choke) knobStarting a cold engine requires a richer
air-fuel mixture, which is supplied by
the starter (choke).
Move the knob in direction
a to turn on
the starter (choke).
Move the knob in direction
b to turn off
the starter (choke).
EAU01214
Steering lockThe steering lock is located on the left
side of the head pipe.
To lock the steering
1. Turn the handlebars all the way to
the right.
2. Open the steering lock cover.
3. Insert the key and turn it counter-
clockwise 1/8 turn.
4. Push the key in and turn it back
1/8 turn clockwise.
5. Check that the steering is locked.
6. Remove the key and close the
steering lock cover.
1. Pointed end positioned over “RES”RES: reserve position
1. Steering lock
E_4YP_Functions.fm Page 9 Wednesday, October 6, 1999 10:03 AM
Page 36 of 91

OPERATION AND IMPORTANT RIDING POINTS
5-2
5 1. Turn the fuel cock to “ON”.
2. Turn the main switch to “ON” and
the engine stop switch to “ ”.
EC000037
CAUTION:@ If the fuel level indicator light comes
on, check the fuel level. If neces-
sary, add fuel. @3. Shift transmission into neutral.NOTE:@ When the transmission is in neutral, the
neutral indicator light should be on. If
the light does not come on, ask a
Yamaha dealer to inspect it. @
4. Turn on the starter (choke) and
completely close the throttle grip.
5. Start the engine by pushing the
starter switch.NOTE:@ If the engine fails to start, release the
starter switch, wait a few seconds, then
try again. Each attempt should be as
short as possible to preserve the bat-
tery. Do not crank the engine more
than 10 seconds on any one attempt. @
ECA00003
CAUTION:@ The oil level indicator light and en-
gine overheat indicator light should
come on when the start switch is
pushed and should go off when the
start switch is released. If the oil lev-
el indicator light flickers or remains
on, immediately stop the engine and
check the engine oil level and for oil
leakage. If necessary, fill the engine
with oil and check to see that the oil
level indicator light goes off. If not,
consult a Yamaha dealer. @
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Page 82 of 91
SPECIFICATIONS
8-2
8
Final gear oil
Type SAE80API “GL-4” Hypoid Gear
Oil
Quantity 0.2 L
Radiator
capacity (including all routes) 2.9 L
Air filterDry type element
Fuel
Type Regular unleaded gasoline
Fuel tank capacity 18 L
Reserve amount 3.5 L
Carburetor
Type ´ quantity BDS28 ´ 4
Manufacturer MIKUNI
Spark plug
Manufacturer/Type NGK / DPR7EA-9 or
DENSO / X22EPR-U9
Gap 0.8 ~ 0.9 mm
Clutch typeWet, multiple-disc
Transmission
Primary reduction system Spur gear
Primary reduction ratio 1.667
Secondary reduction system Shaft drive
Secondary reduction ratio 2.567Transmission type Constant mesh 5-speed
Operation Left foot operation
Gear ratio
1st 2.438
2nd 1.579
3rd 1.160
4th 0.906
5th 0.750
Chassis
Frame type Double cradle
Caster angle 30°
Trail 126 mm
Tires
Front
Type Tubeless
Size 150/80-16 71H
Manufacturer /
modelDunlop / D404F
Rear
Type Tubeless
Size 150/90B15M/C 74H
Manufacturer /
modelDunlop / D404
E_4YP_Spec.fm Page 2 Wednesday, October 6, 1999 10:06 AM