2012 YAMAHA GRIZZLY 350 engine

8-7
8
14*Engine mount 
Check for cracks or other damage, and replace if
necessary. √√√
15 *Axle boots 
Check for cracks or other damage, and replace if
necessary. √√√√√
16 Engine oil 
Change.
 Check ATV for oil leakage, and correct if neces-
sary. √ √√√
17 Engine oil filter car-
tridge 
Replace. √√√
18 Differential gear oil 
Change.
 Check ATV for oil leakage, and correct if neces-
sary. √√
19 Final gear oil 
Change.
 Check ATV for oil leakage, and correct if neces-
sary. √√
20 *Moving parts and
cables 
Lubricate. √√√√
21 *Drive select lever
safety system cable 
Check operation and adjust or replace if neces-
sary. √√√
22 *Throttle lever 
Check operation.
 Check throttle lever free play, and adjust if neces-
sary.
 Lubricate cable and lever housing. √√√√√
NO. ITEM
CHECK OR MAINTENANCE
JOB INITIAL EVERY
Whichev- er comes first month136612
km
(mi) 320
(200) 1300
(800) 2500
(1600) 2500
(1600) 5000
(3200)
hours 20 80 160 160 320U1NS60E0.book Page 7 Monday, August 1, 2011 4:12 PM

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8
EBU23213Checking the spark plug The 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 accor-
dance with the periodic maintenance and lubrica-
tion chart. In addition, the condition of the spark
plug can reveal the condition of the engine.
To remove the spark plug1. Remove the spark plug cap. 2. 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 ATV
is ridden normally).1. Spark plug cap
1. Spark plug wrench
U1NS60E0.book Page 9 Monday, August 1, 2011 4:12 PM

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8
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 ATV.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.
To install the spark plug1. 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.
Specified spark plug:
NGK/DR8EA
1. Spark plug gapSpark plug gap:0.6 –0.7 mm (0.024 –0.028 in)
U1NS60E0.book Page 10 Monday, August 1, 2011 4:12 PM

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8
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 specified
torque as soon as possible.3. Install the spark plug cap.EBU23319Engine oil and oil filter cartridge The 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 spec-
ified in the periodic maintenance and lubrication
chart.
To check the engine oil level 1. 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 ten minutes until the oil set-
tles for an accurate reading.3. Remove the engine oil filler cap, and then wipe the engine oil dipstick off with a clean
rag.
4. Insert the dipstick into the filler hole (without screwing it in), and then remove it again to
check the oil level.
Tightening torque:
Spark plug:18 Nm (1.8 m ·kgf, 13 ft ·lbf)1. Engine oil filler cap
U1NS60E0.book Page 11 Monday, August 1, 2011 4:12 PM

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8
TIPThe engine oil should be between the tip of the dip-
stick and the maximum level mark.5. If the engine oil is not between the tip of thedipstick and the maximum level mark, add
sufficient oil of the recommended type to raise
it to the correct level. NOTICE: Be sure the
engine oil is at the correct level, otherwise
engine damage may result.
[ECB00851]
6. Insert the dipstick into the oil filler hole, and then tighten the engine oil filler cap. To change the engine oil (with or without oil fil-
ter cartridge replacement)
1. Place the ATV on a level surface.
2. Start the engine, warm it up for several min- utes, and then turn it off.
3. Place an oil pan under the engine to collect the used oil.
4. Remove the engine oil filler cap, and then re- move the engine oil drain bolt and its gasket to
drain the oil from the crankcase.1. Engine oil dipstick
2. Maximum level mark
3. Tip of the engine oil dipstick
1. Engine oil drain bolt
2. Gasket
1
1
2
U1NS60E0.book Page 12 Monday, August 1, 2011 4:12 PM

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TIPSkip steps 5–7 if the oil filter cartridge is not being
replaced.5. Remove the oil filter cartridge with an oil filter wrench.
TIPAn oil filter wrench is available at a nearby Yamaha
dealer.6. Apply a thin coat of engine oil to the O-ring ofthe new oil filter cartridge.TIPMake sure that the O-ring is properly seated.
1. Oil filter cartridge
1
1. Oil filter wrench
1
U1NS60E0.book Page 13 Monday, August 1, 2011 4:12 PM

8-14
87. Install the new oil filter cartridge with an oil fil-
ter wrench, and then tighten it to the specified
torque with a torque wrench.
8. Install the engine oil drain bolt and its newgasket, and then tighten the bolt to the speci-
fied torque.
1. O-ring
1. Torque wrenchTightening torque:Oil filter cartridge:17 Nm (1.7 m ·kgf, 12 ft· lbf)
Tightening torque: Engine oil drain bolt:23 Nm (2.3 m ·kgf, 17 ft· lbf)
1
U1NS60E0.book Page 14 Monday, August 1, 2011 4:12 PM

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9. Refill with the specified amount of the recom-
mended engine oil, and then install and tight-
en the engine oil filler cap.
TIPBe sure to wipe off spilled oil on any parts after the
engine and exhaust system have cooled down.NOTICEECB00300
In order to prevent clutch slippage (since the
engine oil also lubricates the clutch), do not
mix any chemical additives. Do not use oils
with a diesel specification of “ CD” or oils of
a higher quality than specified. In addition,
do not use oils labeled “ENERGY CONSERV-
ING II ” or higher.

Make sure that no foreign material enters the
crankcase.10. Start the engine, and then let it idle for several
minutes while checking it for oil leakage. If oil
is leaking, immediately turn the engine off and
check for the cause.
11. Turn the engine off, wait at least ten minutes, and then check the oil level and correct it if
necessary.EBU23386Final gear oil The final gear case must be checked for oil leak-
age before each ride. If any leakage is found, have
a Yamaha dealer check and repair the ATV. In ad-
dition, the final gear oil level must be checked and
the oil changed as follows at the intervals specified
in the periodic maintenance and lubrication chart.
To check the final gear oil level1. Place the ATV on a level surface.
2. Remove the final gear oil filler bolt and its gas- ket, and then check the oil level in the final
gear case. The oil level should be at the brim
of the filler hole.
Recommended oil:
See page 10-1.
Oil quantity: Without oil filter cartridge replacement:2.20 L (2.33 US qt, 1.94 Imp.qt)
With oil filter cartridge replacement: 2.30 L (2.43 US qt, 2.02 Imp.qt)
U1NS60E0.book Page 15 Monday, August 1, 2011 4:12 PM