EBU17421
TABLE OF CONTENTS
LOCATION OF THE WARNING AND
SPECIFICATION LABELS .............................. 1-1
SAFETY INFORMATION ................................ 2-1
DESCRIPTION................................................ 3-1Left view ...................................................... 3-1
Right view.................................................... 3-1
Controls and instruments............................ 3-2
INSTRUMENT AND CONTROL
FUNCTIONS ................................................... 4-1 Main switch ................................................. 4-1
Indicator lights and warning lights .............. 4-1
Self-diagnosis device .................................. 4-3
Handlebar switches .................................... 4-3
Throttle lever ............................................... 4-4
Speed limiter ............................................... 4-5
Clutch lever ................................................. 4-5
Brake lever .................................................. 4-6
Brake pedal ................................................. 4-7
Parking brake lever ..................................... 4-7
Shift pedal ................................................... 4-8
Reverse knob “REV” ................................... 4-9 Fuel tank cap .............................................. 4-9
Fuel ............................................................. 4-9
Seat .......................................................... 4-11
Front shock absorbers (YFM70RSBJ) ...... 4-12
Front shock absorbers (YFM70RSXJ) ...... 4-14
Rear shock absorber (YFM70RSBJ) ......... 4-19
Rear shock absorber (YFM70RSXJ) ......... 4-21
PRE-OPERATION CHECKS .......................... 5-1 Fuel ............................................................. 5-4
Engine oil .................................................... 5-4
Coolant ....................................................... 5-4
Front and rear brakes ................................. 5-4
Throttle lever ............................................... 5-5
Drive chain .................................................. 5-5
Tires ............................................................ 5-5
Chassis fasteners ....................................... 5-7
Instruments, lights and switches ................ 5-7
OPERATION .................................................. 6-1 Starting the engine ..................................... 6-1
Shifting........................................................ 6-2
Operating the reverse knob and driving in reverse ...................................................... 6-4U2LS63E0.book Page 1 Friday, March 31, 2017 8:42 AM
Engine break-in ........................................... 6-5
Parking ........................................................ 6-5
Parking on a slope ...................................... 6-6
Accessories and loading ............................. 6-6
RIDING YOUR ATV ........................................ 7-1 GETTING TO KNOW YOUR ATV ................ 7-2
RIDE WITH CARE AND GOOD JUDGMENT .............................................. 7-2
BE CAREFUL WHERE YOU RIDE ............... 7-8
TURNING YOUR ATV................................ 7-11
CLIMBING UPHILL ................................... 7-13
RIDING DOWNHILL .................................. 7-16
CROSSING A SLOPE................................ 7-17
CROSSING THROUGH SHALLOW WATER .................................................... 7-18
RIDING OVER ROUGH TERRAIN ............. 7-20
SLIDING AND SKIDDING.......................... 7-20
WHAT TO DO IF... ..................................... 7-21
WHAT TO DO... ......................................... 7-22
PERIODIC MAINTENANCE AND
ADJUSTMENT................................................ 8-1 Owner’s manual and tool kit ....................... 8-2
Periodic maintenance chart: Emission control system .......................................... 8-3 Periodic maintenance chart: General
maintenance and lubrication .................... 8-5
Removing and installing the panel............ 8-10
Checking the spark plug........................... 8-10
Engine oil and oil filter element................. 8-13
Coolant ..................................................... 8-18
Cleaning the air filter element ................... 8-22
Cleaning the spark arrester ...................... 8-26
Adjusting the engine idling speed ............ 8-28
Adjusting the throttle lever free play ......... 8-29
Valve clearance......................................... 8-29
Adjusting the reverse lock release cable ....................................................... 8-30
Brakes....................................................... 8-30
Checking the front and rear brake pads... 8-30
Checking the brake fluid level .................. 8-31
Changing the brake fluid .......................... 8-34
Checking the front brake lever free play... 8-34
Checking the brake pedal height.............. 8-35
Adjusting the parking brake free play ....... 8-35
Brake light switches ................................. 8-37
Adjusting the clutch lever free play .......... 8-37
Drive chain slack....................................... 8-39
Lubricating the drive chain ....................... 8-41
Checking and lubricating the cables ........ 8-41
Checking and lubricating the brake and clutch levers ........................................... 8-42
U2LS63E0.book Page 2 Friday, March 31, 2017 8:42 AM
3-1
3
EBU17681
DESCRIPTION
EBU17691Left view
EBU17701Right view
1. Engine oil tank
2. Coolant reservoir
3. Fuel tank cap
4. Idle adjusting screw
5. Battery
6. Fuses
7. Rear shock absorber
8. Drive chain
9. Footrest
10.Shift pedal
12
4
3
659
10
7
8
1. Muffler
2. Spark arrester
3. Air filter
4. Rear brake fluid reservoir
5. Crankcase engine oil filler bolt
6. Oil filter element
7. Spark plug
8. Front shock absorber
9. Crankcase engine oil drain bolt
10.Brake pedal
11.Footrest
12.Rear brake light switch
21
34
5678
109
11
12
U2LS63E0.book Page 1 Friday, March 31, 2017 8:42 AM
4-1
4
EBU17738
INSTRUMENT AND CONTROL FUNCTIONS
EBU29913Main switch“” (on)
All electrical systems are supplied with power. The
engine can be started. The key cannot be re-
moved.
“ ” (off)
All electrical systems are off. The key can be re-
moved.
EBU26697Indicator lights and warning lightsEBU17861Neutral indicator light “ ”
This indicator light comes on when the transmis-
sion is in the neutral position.
1. Main switch
OFF
ON
1
1. Fuel level warning light “ ”
2. Engine trouble warning light “ ”
3. Coolant temperature warning light “ ”
4. Reverse indicator light “R”
5. Neutral indicator light “N”
12 34
5
U2LS63E0.book Page 1 Friday, March 31, 2017 8:42 AM
4-2
4
EBU17831Reverse indicator light “ ”
This indicator light comes on when the transmis-
sion is in the reverse position.EBU29923Coolant temperature warning light “ ”
This warning light comes on when the engine
overheats. When this occurs, stop the engine as
soon as it is safe to do so and allow it to cool for
10 minutes.
The electrical circuit of the warning light can be
checked by turning the key to “ ” (on). The
warning light should come on for a few seconds,
and then go off.
If the warning light does not come on initially when
the key is turned to “ ” (on), or if the warning
light remains on, have a Yamaha dealer check the
vehicle.NOTICEECB00011The engine may overheat if the ATV is over-
loaded. In this case, reduce the load to spec-
ification.
Start the engine after making sure that the
warning light is out. Continuous use while
the warning light is on may cause damage to
the engine.
EBU29933Fuel level warning light “ ”
This warning light comes on when the fuel level
drops below approximately 2.9 L (0.77 US gal,
0.64 Imp.gal). When this occurs, refuel as soon as
possible.
The electrical circuit of the warning light can be
checked by setting the engine stop switch to “ ”
and turning the key to “ ” (on). The warning light
should come on for a few seconds, and then go
off.
If the warning light does not come on initially when
the key is turned to “ ” (on), or if the warning
light remains on, have a Yamaha dealer check the
electrical circuit.EBU29943Engine trouble warning light “ ”
This warning light comes on or flashes when an
electrical circuit monitoring the engine is not work-
ing correctly. When this occurs, have a Yamaha
dealer check the self-diagnosis system.
U2LS63E0.book Page 2 Friday, March 31, 2017 8:42 AM
5-1
5
EBU19203
PRE-OPERATION CHECKS
EBU19226Inspect your vehicle each time you use it to make sure the vehicle is in safe operating condition. Always
follow the inspection and maintenance procedures and schedules described in the Owner’s Manual.
WARNING
EWB00482Failure to inspect or maintain the vehicle properly increases the possibility of an accident or equip-
ment damage. Do not operate the vehicle if you find any problem. If a problem cannot be corrected
by the procedures provided in this manual, have the vehicle inspected by a Yamaha dealer. Before using this vehicle, check the following points:
ITEMROUTINE PAGE
Fuel • Check fuel level in fuel tank,
and add recommended fuel if neces-
sary.
• Check fuel line for leakage. Correct if necessary. 4-9, 5-4
Engine oil • Check oil level in engine oil
tank, and add recommended oil to
specified level if necessary.
• Check ATV for oil leakage. Correct if necessary. 5-4, 8-13
Coolant • Check coolant level in reservoir, and add recommended coolant to
specified level if necessary.
• Check cooling system for leakage. Correct if necessary. 5-4, 8-18
U2LS63E0.book Page 1 Friday, March 31, 2017 8:42 AM
5-4
5
EBU19542FuelMake sure that there is sufficient fuel in the tank.
(See page 4-9.)EBU19561Engine oilMake sure that the engine oil is at the specified
level. Add oil as necessary. (See page 8-13.)EBU19632CoolantMake sure that the coolant is at the specified level.
Add coolant as necessary. (See page 8-18.)TIPThe coolant level must be checked on a cold en-
gine since the level varies with engine tempera-
ture. EBU19713Front and rear brakesBrake lever and brake pedal
Check that there is no free play in the brake le-
ver. If there is free play, have a Yamaha dealer
check the brake system.
Check for correct brake pedal height. (See page
8-35.) If the pedal height is incorrect, have a
Yamaha dealer adjust it.
Check the operation of the lever and pedal.
They should move smoothly and there should
be a firm feeling when the brakes are applied. If
not, have a Yamaha dealer check the brake sys-
tem.
Brake fluid level
Check the brake fluid level. Add fluid if necessary.
(See page 8-31.)
Brake fluid leakage
Check to see if any brake fluid is leaking out of the
pipe joints or brake fluid reservoirs. Apply the
brakes firmly for one minute. If there is any leak-
age, have a Yamaha dealer check the brake sys-
tem. Specified brake fluid:
DOT 4U2LS63E0.book Page 4 Friday, March 31, 2017 8:42 AM
6-1
6
EBU19882
OPERATION
EBU19902Read the Owner’s Manual carefully before riding
the ATV. If there is a control or function you do not
understand, ask your Yamaha dealer.
WARNING
EWB00632Read the Owner’s Manual carefully to become
familiar with all controls in order to help pre-
vent any loss of control, which could cause an
accident or injury. EBU29954Starting the engineNOTICEECB00151See the “Engine break-in” section on page 6-5
prior to operating the engine for the first time. 1. Set the parking brake.
2. Turn the key to “ ” (on) and the engine stopswitch to “ ”.
The following warning lights should come on
for a few seconds, then go off.
Coolant temperature warning light
Fuel level warning light
Engine trouble warning light
NOTICEECB00826To avoid possible damage, do not operate the
ATV if a warning light does not work as de-
scribed above. 3. Shift the transmission into neutral. The neutral
indicator light should come on, if it does not
come on, have a Yamaha dealer check the
electrical circuit.TIPThis model is equipped with an ignition circuit cut-
off system. The engine can be started under the
following conditions.
The transmission is in neutral.
The clutch is disengaged with the transmission
in gear. However, it is recommended to shift
into neutral before starting the engine. 4. Completely close the throttle lever and start
the engine by pushing the start switch.
U2LS63E0.book Page 1 Friday, March 31, 2017 8:42 AM