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8
2. Pull the panel downward while pushing the
projection.
To install a panel
1. Place the panel in the original position.
2. Install the bolts and nut, and then tightenthem to the specified torques.1. Panel G
2. Footboard nut
3. Footboard bolt
4. Panel bolt
5. ProjectionUB1660E0.book Page 17 Thursday, February 26, 2015 4:01 PM
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8-18
8
EBU34190Checking the spark plugThe spark plug is an important engine component,
which is easy to check. Since heat and deposits
will cause any spark plug to slowly erode, the
spark plug should be removed and checked in ac-
cordance with the periodic maintenance and lubri-
cation chart. In addition, the condition of the spark
plug can reveal the condition of the engine.
To remove the spark plug1. Remove panels A and C. (See page 8-10.)
2. Remove the storage compartment by remov- ing the bolt. 3. Remove the spark plug cap.
Tightening torques:
Panel bolt:4.0 Nm (0.40 m·kgf, 2.9 ft·lbf)
Footboard nut: 4.0 Nm (0.40 m·kgf, 2.9 ft·lbf)
1. Storage compartment
2. Bolt
1. Spark plug cap
2 1
1
UB1660E0.book Page 18 Thursday, February 26, 2015 4:01 PM
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8-19
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
UB1660E0.book Page 19 Thursday, February 26, 2015 4:01 PM
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8-20
8To install the spark plug
1. Clean the surface of the spark plug gasket and its mating surface, and then wipe off any
grime from the spark plug threads.
2. Install the spark plug with the spark plug wrench, and then tighten it to the specified
torque.
TIPIf a torque wrench is not available when installing
the spark plug, a good estimate of the correct
torque is 1/4–1/2 turn past finger tight. However,
the spark plug should be tightened to the speci-
fied torque as soon as possible. 3. Install the spark plug cap.
4. Install the storage compartment as shown,and then install the bolt.
5. Install the panels.
1. Spark plug gapSpark plug gap: 0.8–0.9 mm (0.031–0.035 in)
Tightening torque:Spark plug:11 Nm (1.1 m·kgf, 8.0 ft·lbf)
UB1660E0.book Page 20 Thursday, February 26, 2015 4:01 PM
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8-21
8
EBU27468Engine oil and oil filter cartridgeThe engine oil level should be checked before
each ride. In addition, the oil must be changed and
the oil filter cartridge replaced at the intervals
specified in the periodic maintenance and lubrica-
tion chart.
To check the engine oil level1. Place the ATV on a level surface.
2. Check the engine oil level on a cold engine.TIPIf the engine was started before checking the oil
level, be sure to warm up the engine sufficiently,
and then wait at least 10 minutes until the oil set-
tles for an accurate reading. 3. Remove the access cover by turning it coun- terclockwise. 4. Remove the engine oil dipstick, and then
wipe it off with a clean rag.
1. Access cover
1. Engine oil dipstick
1
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8-22
85. Insert the dipstick completely into the oil filler
hole, and then remove it again to check the oil
level.
TIPThe engine oil should be between the minimum
and maximum level marks. 6. If the engine oil is at or below the minimumlevel mark, add sufficient oil of the recom-
mended type to raise it to the correct level.
NOTICE: Be sure the engine oil is at the
correct level, otherwise engine damage
may result.
[ECB00852]
7. Insert the dipstick completely into the oil filler hole.
8. Install the access cover by turning it clock- wise.
To change the engine oil (with or without oil fil-
ter cartridge replacement) 1. Place the ATV on a level surface.
2. Remove the access cover by turning it coun- terclockwise.
3. Place an oil pan under the engine to collect the used oil.
4. Remove the dipstick, and then remove the engine oil drain bolt and its gasket to drain the
oil from the crankcase.
1. Maximum level mark
2. Minimum level markUB1660E0.book Page 22 Thursday, February 26, 2015 4:01 PM
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8
TIPSkip steps 5–9 if the oil filter cartridge is not being
replaced. 5. Remove panel F. (See page 8-10.)
6. Remove the oil filter cartridge with an oil filterwrench.
TIPAn oil filter wrench is available at a nearby Yamaha
dealer. 7. Apply a thin coat of engine oil to the O-ring ofthe new oil filter cartridge.
1. Engine oil drain bolt
2. Gasket
12
1. Oil filter cartridge
2. Oil filter wrench
1
2
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8
TIPMake sure that the O-ring is properly seated. 8. Install the new oil filter cartridge with an oil fil-ter wrench, and then tighten it to the specified
torque with a torque wrench. 9. Install panel F.
10. Install the engine oil drain bolt and its new gasket, and then tighten the bolt to the spec-
ified torque.1. O-ring
1. Torque wrenchTightening torque:Oil filter cartridge:15 Nm (1.5 m·kgf, 11 ft·lbf)
Tightening torque: Engine oil drain bolt:22 Nm (2.2 m·kgf, 16 ft·lbf)
1
UB1660E0.book Page 24 Thursday, February 26, 2015 4:01 PM