2010 YAMAHA GRIZZLY 125 Owners Manual

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5. Remove the air filter case cover by removing
the screw.6. Remove the air filter element.
1. Panel
2. Coupler
1
2

1. Air filter case cover
2. Screw
12

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7. Tap the air filter element lightly to remove
most of the dust and dirt. Blow out the remain-
ing dirt with compressed air as shown.8. Check the air filter element and replace it if
damaged.
9. Install the air filter element into the air filter
case.
10. Install the air filter case cover by installing the
screw.
11. Connect the coupler, and then install the pan-
el by installing the quick fasteners.
12. Install the front carrier by installing the bolts.
EBU27630
Cleaning the spark arrester
Be sure the exhaust pipe and muffler are cool be-
1. Air filter element
1

1. Air filter element
1

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fore cleaning the spark arrester.
1. Remove the screws.
2. Remove the tailpipe by pulling it out of the
muffler.
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. Insert the tailpipe into the muffler and align the
screw holes.
5. Install the screws and tighten them.
WARNING

EWB02340
Do not start the engine when cleaning the
spark arrester, otherwise it could cause injury
to the eyes, burns, carbon monoxide poison-
ing, possibly leading to death, and start a fire.
Always let the exhaust system cool prior to
1. Screw
1

1. Screw
2. Gasket
3. Tailpipe
4. Spark arrester
3
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touching exhaust components.
EBU23930
V-belt case drain plug
After riding in water deep enough to allow it to en-
ter the V-belt case, remove this plug to drain the
water from the case.
TIP

If 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.
EBU23940
Adjusting the carburetor
The carburetor should be checked and, if neces-
sary, adjusted at the intervals specified in the peri-
odic maintenance and lubrication chart. The
carburetor is an important part of the engine and
requires very sophisticated adjustment. Therefore,
most carburetor adjustments should be left to a
Yamaha dealer, who has the necessary profes-
sional knowledge and experience. The adjustment
described in the following section, however, may
be performed by the owner as part of routine main-
tenance.
NOTICE

ECB00480
The carburetor has been set and extensively
tested at the Yamaha factory. Changing these
settings without sufficient technical knowl-
edge may result in poor performance of or
damage to the engine.
EBU24000
Adjusting the engine idling speed
The engine idling speed must be checked and, if
necessary, adjusted as follows at the intervals
specified in the periodic maintenance and lubrica-
1. V-belt case drain plug
1

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tion chart.
TIP

A diagnostic tachometer is needed to make this
adjustment.
1. Start the engine and warm it up.
TIP

The engine is warm when it quickly responds to the
throttle.
2. Attach the tachometer to the spark plug lead.
3. Check the engine idling speed and, if neces-
sary, adjust it to specification by turning the
throttle stop screw at the carburetor. To in-
crease the engine idling speed, turn the throt-
tle stop screw in direction (a), and to decrease
it, turn the screw in direction (b).
TIP

If the specified idling speed cannot be obtained as
described above, have a Yamaha dealer make the
adjustment.
EBU24045
Adjusting the throttle cable free play
The throttle cable free play should be checked
and, if necessary, adjusted at the intervals speci-
1. Throttle stop screw
Engine idling speed:
1650–1750 r/min
(a)(b) 1

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fied in the periodic maintenance and lubrication
chart.
The throttle cable free play should measure 1.0–
3.0 mm (0.04–0.12 in) at the throttle lever. Period-
ically check the throttle cable free play and, if nec-
essary, adjust it as follows.
TIP

The engine idling speed must be checked, and ad-
justed if necessary, before adjusting the throttle ca-
ble free play.
1. Slide the rubber cover back.
2. Loosen the locknut.
3. To increase the throttle cable free play, turn
the throttle cable free play adjusting bolt in di-
rection (a). To decrease the throttle cable free
play, turn the adjusting bolt in direction (b).
4. Tighten the locknut.
5. Slide the rubber cover to its original position.
EBU24060
Valve clearance
The valve clearance changes with use, resulting in
improper air-fuel mixture and/or engine noise. To
prevent this from occurring, the valve clearance
must be adjusted by a Yamaha dealer at the inter-
vals specified in the periodic maintenance and lu-
1. Rubber cover
2. Throttle cable free play adjusting bolt
3. Locknut
4. Throttle cable free play
4 3
2
1
(a) (b)

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brication chart.
EBU29601
Brakes
Replacement of brake components requires pro-
fessional knowledge. Brake service should be per-
formed by a Yamaha dealer.
WARNING

EWB02571
Operating with improperly serviced or adjust-
ed brakes could lead to a loss in braking ability
and an accident.
EBU24090
Checking the front and rear brake
shoes
The front and rear brake shoes must be checked
for wear at the intervals specified in the periodic
maintenance and lubrication chart. Each brake is
provided with a wear indicator, which allows you to
check the brake shoe wear without having to dis-
assemble the brake. To check the brake shoe
wear, check the position of the wear indicator while
applying the brake. If a brake shoe has worn to the
point that the wear indicator reaches the wear limit
line or mark, have a Yamaha dealer replace the
brake shoes as a set.
Front brake
1. Wear limit line
2. Wear indicator
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Rear brake

EBU24371
Adjusting the front brake lever free
play
The brake lever free play must be checked and, if
necessary, adjusted at the intervals specified in
the periodic maintenance and lubrication chart.
TIP

Before adjusting the brake lever free play, check
the front brake shoes for wear.
The brake lever free play should measure 5.0–8.0mm (0.20–0.31 in) as shown. If the free play is in-
correct, adjust it as follows.
1. Remove the front carrier by removing the
bolts.
1. Wear limit line
2. Wear indicator
1
2

1. Brake lever free play
1