YAMAHA VIKING 2015 Owners Manual

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Changing the coolant
The coolant must be changed by a Yamaha
dealer at the intervals specified in the periodic
maintenance and lubrication chart.
Adding water instead of coolant lowers the
antifreeze content of the coolant. If water is
used instead of coolant, have a Yamaha deal-
er check the antifreeze content of the coolant
as soon as possible.
The radiator fan is automatically switched on
or off according to the coolant temperature in
the radiator.NOTICEMix antifreeze with distilled water only.
However, if distilled water is not available,
soft water may be used for refilling.If your vehicle overheats, see page 8-58 for
instructions.
EVU00740Axle bootsCheck the axle boots for holes or tears.
If any damage is found, have them replaced
by a Yamaha dealer.1. Front axle boot (× 2 each side)
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1. Rear axle boot ( × 2 each side)
EVU00750Spark plug inspectionRemoval
1. Lift the cargo bed up. (See page 4-27 for cargo bed lifting and lowering proce-
dures.)
2. Remove the spark plug cap.1. Spark plug cap3. Use the spark plug wrench in the tool kit to remove the spark plug as shown.
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1. Spark plug wrench
Inspection
The spark plug is an important engine compo-
nent and is easy to inspect. The condition of
the spark plug can indicate the condition of
the engine.
The ideal color of the porcelain insulator
around the center electrode is a medium-to-
light tan for a vehicle that is being ridden nor-
mally.
You should periodically remove and inspect
the spark plug because heat and deposits will
cause the spark plug to slowly break down
and erode. If electrode erosion becomes ex-
cessive, or if carbon and other deposits are
excessive, you should replace the spark plug
with the specified plug.
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Specified spark plug:CPR7EA-9 (NGK)
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Measure the spark plug gap with a wire thick-
ness gauge and, if necessary, adjust the gap
to specification.a. Spark plug gap
Installation 1. Clean the surface of the spark plug gas- ket and its mating surface, and then wipe
off any grime from the spark plug
threads.
2. Install the spark plug and tighten it to the
specified torque. If a torque wrench is not
available when you are installing the
spark plug, a good estimate of the correct
torque is one-quarter to one-half turn
past finger tight. Have the spark plug
tightened to the specified torque as soon
as possible.
3. Install the spark plug cap.
4. Lower the cargo bed.
Spark plug gap:
0.8–0.9 mm (0.031–0.035 in)
Tightening torque:Spark plug: 13 Nm (1.3 m·kgf, 9.4 ft·lbf)
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5B410016Cleaning the air filter elementThe air filter element should be cleaned every
20–40 hours. It should be cleaned and lubri-
cated more often if the vehicle is operated in
extremely dusty areas. Each time air filter ele-
ment maintenance is performed, check the air
inlet to the air filter case for obstructions.
Check the air filter element rubber joint to the
throttle body and manifold fittings for an air-
tight seal. Tighten all fittings securely to avoid
the possibility of unfiltered air entering the en-
gine.NOTICENever operate the engine with the air filter
element removed. Doing so would allow
unfiltered air to enter, causing rapid en-
gine wear and possible engine damage.
Additionally, the fuel injection system
would be affected, resulting in poor engine
performance and possible overheating.
1. Remove the center passenger seat cush-
ion. (See page 4-18 for seat cushion re-
moval and installation procedures.)
2. Remove the air filter case cover by un- hooking the holders.1. Air filter case cover holder ( × 6)
2. Air filter case cover
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3. Remove the air filter element.1. Air filter element
4. While pushing the projections on the air filter frame inward, remove the air filter el-
ement holder.1. Air filter element holder 2. Projection ( × 2)
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5. Remove the sponge material from the airfilter frame.1. Air filter element holder 2. Sponge material
3. Air filter frame
6. Wash the sponge material gently but thoroughly in parts cleaning solvent.
WARNING! Using gasoline or other
flammable solvents to clean the air fil-
ter element can cause a fire or explo-
sion, which could lead to serious
injury.
7. Squeeze the excess solvent out of the sponge material. NOTICE: Do not twist
the sponge material when squeezing
it.
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8. Wash the sponge material in warm soapy water to remove remaining solvent, then
rinse thoroughly with plain warm water.
9. Squeeze excess water out of the sponge material. NOTICE: Do not twist the
sponge material when squeezing it.
10. Allow the sponge material to dry thor- oughly. Inspect the sponge material and
replace it if damaged.
11. Thoroughly apply Yamaha foam air filter oil or other quality liquid foam air filter oil
(not spray type) to the sponge material.
The sponge material should be wet but
not dripping.
12. Pull the sponge material over its frame.
13. Install the air filter element holder.
14. Install the air filter element. 15. Fit the holders on the air filter case cover
onto the projections on the air filter case,
and then install the air filter case cover by
hooking the holders onto the cover.
1. Holder ( × 3) 2. Projection ( × 3)16. Install the center passenger seat cush-
ion.
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Cleaning the air filter case/duct check
hoseThere is a check hose at the bottom of the air
filter case under the cargo bed and a check
hose at the bottom of the air duct. The air duct
check hose can be accessed under the vehi-
cle. If dust or water collects in a check hose,
empty the hose and clean the air filter element
and air filter case.1. Air filter case check hose 1. Air duct check hose
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EVU00780V-belt case drain plugThe V-belt case drain plug is located under
the cargo bed. (See page 4-27 for cargo bed
lifting and lowering procedures.)
After riding in water deep enough to allow wa-
ter to enter the V-belt case, remove the drain
plug to drain any water from the case.
If water drains from the V-belt case after re-
moving the drain plug, have a Yamaha dealer
inspect the vehicle, as the water may affect
other engine parts.1. V-belt case drain plug
5B410018Cleaning the spark arrester
WARNING
Hot exhaust system may cause burns. To
avoid burns or fires, make sure that the en-
gine is stopped and the exhaust system is
cool before cleaning the spark arrester. Do
not start the engine while cleaning the ex-
haust system.1. Remove the tailpipe bolts.1. Tailpipe bolt ( × 4)
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