Page 12 of 264

LOCATION OF THE WARNING AND
SPECIFICATION LABELS .......................1-1
SAFETY INFORMATION .........................2-1
DESCRIPTION AND MACHINE
IDENTIFICATION.....................................3-1
Identification number records ...............3-3
Key identification number .....................3-5
Vehicle identification number ...............3-5
Model label ...........................................3-7
CONTROL FUNCTIONS .........................4-1
Main switch ...........................................4-1
Handlebar switches ..............................4-3
Throttle lever ........................................4-5
Throttle OverRide System ....................4-7
Speed limiter ........................................4-9
Clutch lever ........................................4-11
4
3
2
1Front brake lever ................................4-11
Rear brake pedal ................................4-13
Parking brake .....................................4-13
Shift pedal ..........................................4-17
Kick starter .........................................4-17
Fuel tank cap ......................................4-19
Fuel cock ............................................4-19
Starter (choke)....................................4-21
Seat ....................................................4-23
Front shock absorber adjustment .......4-25
Rear shock absorber adjustment .......4-27
PRE-OPERATION CHECKS ...................5-1
Front and rear brakes ...........................5-5
Fuel ....................................................5-11
Engine mixing oil ................................5-15
Transmission oil .................................5-17
Chain ..................................................5-19
Throttle lever ......................................5-19
5
EBU00015
CONTENTS
Page 13 of 264

Fittings and fasteners .........................5-19
Lights ..................................................5-21
Switches .............................................5-21
Tires ...................................................5-23
How to measure tire pressure ............5-27
Tire wear limit .....................................5-29
OPERATION ............................................6-1
Starting a cold engine...........................6-3
Starting a warm engine ........................6-9
Warming up ..........................................6-9
Shifting ...............................................6-11
To start out and accelerate.................6-15
To decelerate .....................................6-19
Engine break-in ..................................6-21
Parking ...............................................6-25
Parking on a slope..............................6-27
Accessories and loading ....................6-29
6
Riding Your ATV ......................................7-1
Getting to know your ATV ....................7-3
Ride with care and good
judgement...........................................7-5
Be careful where you ride...................7-27
Turning your ATV ...............................7-41
Climbing uphill ....................................7-45
Riding downhill ...................................7-57
Crossing a slope .................................7-61
Crossing through shallow water .........7-65
Riding over rough terrain ....................7-69
Sliding and skidding ...........................7-71
What to do if .......................................7-75
What to do ..........................................7-75
PERIODIC MAINTENANCE AND
ADJUSTMENT .........................................8-1
Owner’s manual and tool kit .................8-3
Periodic maintenance/Lubrication ........8-7
Transmission oil .................................8-17
8
7
Page 102 of 264
5-15
EBU00132
Engine mixing oil
If Yamalube “R” oil is not available, select an oil
from the following list.
cC
Never mix two types of oil in the same batch.
Always use the same type of oil to ensure
maximum engine performance.
Recommended oil:
Yamalube “R”
(Yamalube Racing 2-cycle oil)
Mixing ratio: 24:1
Recommended oil Mixing ratio
Castrol R30
A545 20:1
A747
Page 104 of 264
5-17
EBU00490
Transmission oil
Make sure the transmission oil is at the specified
level. Add oil as necessary. (See pages 8-17 ~
8-23.)
cC
Be sure to use motor oils that do not contain
anti-friction modifiers. Passenger car motor
oils (often labeled “Energy Conserving”) con-
tain anti-friction additives which will cause
clutch and/or starter clutch slippage, result-
ing in reduced component life and poor
engine performance.
Recommended oil:
SAE 10W30
Recommended oil classification:
API Service SE, SF, SG type or higher
Oil quantity:
Total amount:
1.7 L
Periodic oil change:
1.5 L
Page 242 of 264
9-7
EBU00529
B. STORAGE
Long term storage (60 days or more) of your
machine will require some preventive proce-
dures to guard against deterioration. After thor-
oughly cleaning the machine, prepare for stor-
age as follows:
1. Drain the fuel tank, fuel lines and carbure-
tor float bowls.
2. Remove the spark plugs, pour about one
tablespoon of SAE 10W30 or 20W40
motor oil in the spark plug holes and rein-
stall the spark plugs. Ground the spark
plug wires and turn the engine over several
times to coat the cylinder walls with oil.
3. Clean the drive chain thoroughly and lubri-
cate it. (See page 8-93 for details.)
Reinstall the chain or store it in a plastic
bag tied to frame for safekeeping.
4. Lubricate all control cables.
Page 246 of 264
10-1
Model YFZ350
Dimensions:
Overall length 1,855 mm
Overall width 1,100 mm
Overall height 1,080 mm
Seat height 800 mm
Wheelbase 1,280 mm
Minimum ground clearance 135 mm
Minimum turning radius 3,600 mm
Basic weight:
With oil and full fuel tank 187 kg
Engine:
Engine type Liquid-cooled 2-stroke
Cylinder arrangement Forward-inclined parallel 2-cylinder
Displacement 347 cm
3
Bore× stroke 64×54 mm
Compression ratio 6.5 : 1
Starting system Kick starter
Lubrication system Premix
EBU00428
SPECIFICATIONS
Page 247 of 264
10-2
Model YFZ350
Engine oil (2-cycle):
Type Yamalube R, Castrol R30, A545, A747
Mixing ratio See page 5-15.
Transmission oil:
Type SAE10W-30
Rcommended transmission oil classification: API Service SE, SF, SG type or higher
Quantity
Periodic oil change 1.5 L
Total amount 1.7 L
Radiator:
(Including all routes) 1.5 L
Air filter: Wet type element
10
cC
Be sure to use motor oils that do not contain
anti-friction modifiers. Passenger car motor
oils (often labeled “Energy Conserving”)
contain anti-friction additives which will
cause clutch and/or starter clutch slippage,
resulting in reduced component life and poor
engine performance.