2007 YAMAHA GRIZZLY 350 maintenance

8-4
8
6*Rear brakeCheck operation and correct if necessary.
Check brake lever and pedal free play, and adjust
if necessary.√√√√√
Replace brake friction plates. Whenever worn to the limit
7*Brake hosesCheck for cracks or other damage, and replace if
necessary.√√√√
Replace. Every 4 years
8*WheelsCheck runout and for damage, and replace if nec-
essary.√ √√√
9*TiresCheck tread depth and for damage, and replace if
necessary.
Check air pressure and balance, and correct if
necessary.√ √√√
10*Wheel bearingsCheck for looseness or damage, and replace if
necessary.√ √√√
11*V- b e l tCheck for wear, cracks or other damage, and re-
place if necessary.√ √√√
12*Drive shaft univer-
sal jointLubricate with lithium-soap-based grease.√√√
13*Chassis fastenersMake sure that all nuts, bolts, and screws are
properly tightened.√√√√√
14*Shock absorber as-
sembliesCheck operation and correct if necessary.
Check for oil leakage and replace if necessary.√√√
15*Stabilizer bushesCheck for cracks or other damage, and replace if
necessary.√√√ NO. ITEMCHECK OR MAINTENANCE
JOBINITIAL EVERY
Whichev-
er comes
firstmonth136612
km
(mi)320
(200)1200
(750)2400
(1500)2400
(1500)4800
(3000)
hours 20 75 150 150 300U4S260E0.book Page 4 Tuesday, October 3, 2006 1:53 PM

8-5
8
16*Knuckle pivots• Lubricate with lithium-soap-based grease.√√√
17*Steering shaft Lubricate with lithium-soap-based grease.√√√
18*Steering system Check operation and repair or replace if damaged.
 Check toe-in and adjust if necessary.√√√√√
19*Engine mount Check for cracks or other damage, and replace if
necessary.√√√
20*Axle boots Check for cracks or other damage, and replace if
necessary.√√√√√
21*Carburetor Check starter (choke) operation and correct if nec-
essary.
 Check engine idling speed and adjust if neces-
sary.√√√√
22*Crankcase breather
system Check breather hose for cracks or other damage,
and replace if necessary.√√√
23 Engine oil Change.
 Check ATV for oil leakage, and correct if neces-
sary.√ √√√
24Engine oil filter car-
tridge Replace.√√√
25 Differential gear oil Change.
 Check ATV for oil leakage, and correct if neces-
sary.√√
26 Final gear oil Change.
 Check ATV for oil leakage, and correct if neces-
sary.√√√ NO. ITEMCHECK OR MAINTENANCE
JOBINITIAL EVERY
Whichev-
er comes
firstmonth136612
km
(mi)320
(200)1200
(750)2400
(1500)2400
(1500)4800
(3000)
hours 20 75 150 150 300U4S260E0.book Page 5 Friday, October 20, 2006 11:30 AM

8-6
8
EBU28390NOTE:

The air filter needs more frequent service if you are riding in unusually wet or dusty areas.
Hydraulic brake service
Regularly check and, if necessary, correct the brake fluid level.27*Moving parts and
cablesLubricate.√√√√
28*Drive select lever
safety system cableCheck operation and adjust or replace if neces-
sary.√√√
29*Throttle lever hous-
ing and cableCheck operation and correct if necessary.
Check throttle cable free play and adjust if neces-
sary.
Lubricate throttle lever housing and cable.√√√√√
30*Exhaust systemCheck for leakage and replace gasket(s) if neces-
sary.
Check for looseness and tighten all screw clamps
and joints if necessary.√√√
31 Spark arresterClean.√√√
32*Front and rear brake
switchesCheck operation and correct if necessary.√√√√√
33*Lights and switchesCheck operation and correct if necessary.
Adjust headlight beams.√√√√√ NO. ITEMCHECK OR MAINTENANCE
JOBINITIAL EVERY
Whichev-
er comes
firstmonth136612
km
(mi)320
(200)1200
(750)2400
(1500)2400
(1500)4800
(3000)
hours 20 75 150 150 300U4S260E0.book Page 6 Tuesday, October 3, 2006 1:53 PM

8-8
8
EBU23080Removing and installing the panel The panel shown needs to be removed to perform
some of the maintenance jobs described in this
chapter. Refer to this section each time the panel
needs to be removed and installed.EBU23111Panel A
To remove the panelRemove the bolt, and then take the panel off.To install the panel
Place the panel in the original position and install
the bolt.CAUTION:ECB00380When installing the panel, be sure not to pinchthe cables or wires.EBU23211Checking 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
1. Panel A
1. Panel A
2. Bolt
U4S260E0.book Page 8 Tuesday, October 3, 2006 1:53 PM

8-9
8 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 plug
1. 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).
NOTE:If 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 erosion
and excessive carbon or other deposits, and
replace it if necessary.
1. Spark plug cap
1. Spark plug wrench
U4S260E0.book Page 9 Tuesday, October 3, 2006 1:53 PM

8-10
8To install the spark plug
1. Measure the spark plug gap with a wire thick-
ness gauge and, if necessary, adjust the gap
to specification.
2. Clean the surface of the spark plug gasket
and its mating surface, and then wipe off any
grime from the spark plug threads.3. Install the spark plug with the spark plug
wrench, and then tighten it to the specified
torque.
NOTE:If a torque wrench is not available when installing
a 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 assoon as possible.
4. Install the spark plug cap.EBU23312Engine 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. Specified spark plug:
NGK/DR8EA
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)
1. Spark plug gap
Tightening torque:
Spark plug:
17.5 Nm (1.75 m·kgf, 12.7 ft·lbf)
U4S260E0.book Page 10 Tuesday, October 3, 2006 1:53 PM

8-14
8
CAUTION:ECB00300
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 thecrankcase.
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.
EBU28570Final 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 level
1. Place the ATV on a level surface.NOTE:The final gear oil level must be checked on a coldengine.
2. Remove the final gear oil filler bolt, and then
check the oil level in the final gear case.NOTE: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)
U4S260E0.book Page 14 Tuesday, October 3, 2006 1:53 PM

8-17
8
CAUTION:ECB00420Be sure no foreign material enters the finalgear case.
7. Install the oil filler bolt, and then tighten it to the
specified torque.
8. Check the final gear case for oil leakage. If oil
is leaking, check for the cause.
9. Install the engine guard and the final gear
case guard by installing the bolts, and then
tightening them to the specified torques.
EBU23421Differential gear oil The differential gear case must be checked for oil
leakage before each ride. If any leakage is found,
have a Yamaha dealer check and repair the ATV.
In addition, the differential gear oil level must be
checked and the oil changed as follows at the in-
tervals specified in the periodic maintenance and
lubrication chart.
To check the differential gear oil level
1. Place the ATV on a level surface.NOTE:The differential gear oil level must be checked ona cold engine.
2. Remove the differential gear oil filler bolt, and
then check the oil level in the differential gear
case. Tightening torque:
Final gear oil filler bolt:
23 Nm (2.3 m·kgf, 17 ft·lbf)
Tightening torques:
Engine guard bolt:
7 Nm (0.7 m·kgf, 5.1 ft·lbf)
Final gear case guard bolt:
7 Nm (0.7 m·kgf, 5.1 ft·lbf)
U4S260E0.book Page 17 Tuesday, October 3, 2006 1:53 PM