8-18
8
4. Remove the spark plug as shown, with the
spark plug wrench included in the owner’s
tool kit.
To check the spark plug 1. Check that the porcelain insulator around the center electrode of the spark plug is a medi-
um-to-light tan (the ideal color when the vehi-
cle is ridden normally).
TIPIf the spark plug shows a distinctly different color,
the engine could be operating improperly. Do not
attempt to diagnose such problems yourself. In-
stead, have a Yamaha dealer check the vehicle. 2. Check the spark plug for electrode erosionand excessive carbon or other deposits, and
replace it if necessary.
3. Measure the spark plug gap with a wire thick- ness gauge and, if necessary, adjust the gap
to specification.
1. Spark plug wrench
1
Specified spark plug:NGK/CPR7EA-9
UB1662E0.book Page 18 Monday, April 17, 2017 11:39 AM
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8
WARNING
EWB02342Always let the exhaust system cool prior to
touching exhaust components.
Do not start the engine with the spark arrester
removed. Sparks or exhaust particulate can
cause eye injury, burns, or start a fire. 1. Remove the tailpipe bolts.
2. Remove the tailpipe by pulling it out of themuffler, and then remove the gasket. 3. Tap the tailpipe lightly, and then use a wire
brush to remove any carbon deposits from
the spark arrester portion of the tailpipe and
inside of the tailpipe housing.
4. Check the gasket for damage. Replace if nec- essary.
5. Install the gasket onto the tailpipe, then insert the tailpipe into the muffler and align the bolt
holes.
6. Install the bolts and tighten to the specified torque.
EBU23932V-belt case drain plugAfter riding in water deep enough to allow it to en-
ter the V-belt case, remove the V-belt case drain
plug to drain the water from the case.TIPIf water drains from the V-belt case after removing
the plug, have a Yamaha dealer check the ATV as
the water may affect other engine parts.
1. Gasket
2. Spark arrester
3. Tailpipe
4. Tailpipe bolt
3
2
4
1
4
Tightening torque:
Tailpipe bolt:10 N·m (1.0 kgf·m, 7.4 lb·ft)
UB1662E0.book Page 40 Monday, April 17, 2017 11:39 AM
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8
NOTICEECB00641To prevent accidental short-circuiting, turn off
the main switch when checking or replacing a
fuse. 1. Turn off all electrical systems. (See page 4-1.)
2. Remove panel A. (See page 8-9.)
3. Remove the blown fuse, and then install anew fuse of the specified amperage.
WARNING! Always use a fuse of the spec- ified rating, and never use a substitute ob-
ject in place of the proper fuse. An
improper fuse or a substitute object can
cause damage to the electrical system,
which could lead to a fire.
[EWB02173]
4. Turn on the main switch and start the engine. Specified fuses:
Main fuse:40.0 A
Headlight fuse: 10.0 A (YFM70KDHJ, YFM70KDXJ)
15.0 A (YFM70KPAJ, YFM70KPHJ,
YFM70KPSJ, YFM70KPXJ)
Ignition fuse: 10.0 A
Four-wheel-drive motor fuse: 10.0 A (YFM70KPAJ, YFM70KPHJ,
YFM70KPSJ, YFM70KPXJ)
Signaling system fuse: 10.0 A
Auxiliary DC jack fuse: 10.0 A
Radiator fan motor fuse: 20.0 A
Fuel injection system fuse: 15.0 A
EPS fuse: 40.0 A (YFM70KPAJ, YFM70KPHJ,
YFM70KPSJ, YFM70KPXJ)
UB1662E0.book Page 58 Monday, April 17, 2017 11:39 AM
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12
INDEX
AAccessories and loading ................................................ 6-5
Accessories, DC jack ...................................................4-24
Air filter element, cleaning ............................................ 8-37
Axle boots .................................................................... 8-48BBattery .......................................................................... 8-53
Brake fluid, changing ...................................................8-44
Brake fluid level, checking ........................................... 8-43
Brake lever free play, checking the front ..................... 8-45
Brake lever, front .......................................................... 4-15
Brake levers, checking and lubricating ........................ 8-49
Brake light switches ..................................................... 8-48
Brake pads and friction plates, checking ..................... 8-42
Brake pedal and rear brake lever ................................. 4-16
Brake pedal, checking and lubricating ........................ 8-50
Brakes .......................................................................... 8-42
Brakes, front and rear .................................................... 5-3CCables, checking and lubricating ................................. 8-49
Carrier, front ................................................................. 4-21
Carrier, rear .................................................................. 4-22
Chassis fasteners ........................................................... 5-6
Cleaning ......................................................................... 9-1
Coolant ................................................................. 5-3, 8-29
Coolant temperature warning light ................................. 4-3DDifferential gear lock, indicators (YFM70KPXJ / YFM70KPAJ / YFM70KPHJ / YFM70KPSJ) ................ 4-5 Differential gear oil ............................................... 5-3, 8-27
Drive lever 2WD/4WD (YFM70K
DXJ / YFM70KDHJ) ... 4-13
Drive select lever .......................................................... 4-16
Drive select lever and driving in reverse ........................ 6-2
EEngine break-in .............................................................. 6-4
Engine oil ....................................................................... 5-3
Engine oil and oil filter cartridge .................................. 8-20
Engine stop switch ......................................................... 4-9
Engine trouble warning light .......................................... 4-3
EPS warning light (for EPS model) ................................. 4-4FFinal gear oil ......................................................... 5-3, 8-24
Four-wheel drive icon (YFM70KPXJ / YFM70KPAJ / YFM70KPHJ / YFM70KPSJ) ........................................ 4-5
Four-wheel drive indica tor light (YFM70KDXJ /
YFM70KDHJ) ............................................................... 4-4
Four-wheel drive switch (On-Command 4WD)
(YFM70KPXJ / YFM70KPAJ / YFM70KPHJ /
YFM70KPSJ) ............................................................. 4-11
Fuel ...................................................................... 4-17, 5-3
Fuel level warning light (YFM70KDXJ / YFM70KDHJ) ............................................................... 4-3
Fuel tank cap ............................................................... 4-17
Fuses, replacing ........................................................... 8-57HHandlebar switches ....................................................... 4-8
Headlight beam, adjusting ........................................... 8-62
Headlight bulb, replacing ............................................. 8-59
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12
High-range indicator light (YFM70KPXJ / YFM70KPAJ / YFM70KPHJ / YFM70KPSJ) ................ 4-2
Horn switch .................................................................. 4-10IIdentification numbers ................................................. 11-1
Indicator lights and warning lights ................................. 4-1
Instruments, lights and switches ................................... 5-6LLabel locations ............................................................... 1-1
Light switch .................................................................. 4-10
Low-range indicator light (YFM70KPXJ / YFM70KPAJ / YFM70KPHJ / YFM70KPSJ) ................ 4-2MMain switch .................................................................... 4-1
Maintenance and lubrication chart ................................ 8-5
Maintenance chart, emission control system ................ 8-3
Model label .................................................................. 11-1
Multi-function display (YFM70KPXJ / YFM70KPAJ / YFM70KPHJ / YFM70KPSJ) ....................................... 4-5NNeutral indicator light ..................................................... 4-2OOn-Command drive switch “4WD/LOCK” (YFM70KPXJ / YFM70KPAJ / YFM70KPHJ /
YFM70KPSJ) ............................................................. 4-12
Override switch (YFM70KPXJ / YFM70KPAJ / YFM70KPHJ / YFM70KPSJ) ..................................... 4-10
Owner’s manual and tool kit .......................................... 8-2PPanels, removing and installing ..................................... 8-9
Park indicator light ......................................................... 4-2 Parking ........................................................................... 6-4
Parking on a slope ......................................................... 6-5
Part locations ................................................................. 3-1
RRear brake, adjusting the lever, pedal free play .......... 8-45
Rear knuckle pivots, lubricating .................................. 8-52
Reverse indicator light ................................................... 4-2
Riding your ATV ............................................................. 7-1SSafety information .......................................................... 2-1
Seat .............................................................................. 4-19
Shock absorber assemblies, adjusting the front and
rear (YFM70KPXJ / YFM70KPAJ / YFM70KPHJ /
YFM70KPSJ) ............................................................. 4-22
Spark arrester, cleaning ............................................... 8-39
Spark plug, checking ................................................... 8-17
Specifications .............................................................. 10-1
Speed limiter ................................................................ 4-15
Stabilizer bushes, checking .......... ............................... 8-51
Starting the engine ........................................................ 6-1
Start switch .................................................................. 4-10
Steering shaft, lubricating ............................................ 8-52
Storage .......................................................................... 9-2
Storage compartment .................................................. 4-20TTail/brake light bulb, replacing .................................... 8-63
Throttle lever ......................................................... 4-14, 5-4
Throttle lever free play, adjusting ................................ 8-41
Tires ............................................................................... 5-4
Trailer hitch (YFM70KPXJ / YFM70KPAJ / YFM70KPHJ / YFM70KPSJ) ..................................... 4-23
Troubleshooting ........................................................... 8-65
UB1662E0.book Page 2 Monday, April 17, 2017 11:39 AM