2009 YAMAHA GRIZZLY 125 maintenance

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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 andrequires 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-
tion chart.
TIP

A diagnostic tachometer is needed to make this
adjustment.
1. Start the engine and warm it up.
1. V-belt case drain plug
1

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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.
EBU24044
Adjusting the throttle cable free play
The throttle cable free play should be checked
and, if necessary, adjusted at the intervals speci-
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. Loosen the locknut.
2. 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).
1. Throttle stop screw
Engine idling speed:
1650–1750 r/min
(a)(b) 1

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3. Tighten the locknut.
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-
brication chart.
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.
1. Locknut
2. Throttle cable free play adjusting bolt
3. Throttle cable free play
3 1
2
(a) (b)

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Front brake Rear brake

EBU24370
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 5.0–8.0
1. Wear limit line
2. Wear indicator
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1. Wear limit line
2. Wear indicator
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8. Tighten the locknut at the brake lever.
9. Install the V-belt air filter element cover by in-
stalling the screw.
10. Connect the coupler, and then install the pan-
el by installing the quick fasteners.
11. Install the front carrier by installing the bolts.
WARNING

EWB02080
Operating with improperly serviced or adjust-
ed brakes could cause loss of braking ability,
which could lead to an accident.After servicing:

Make sure the brakes operate smoothly and
that the free play is correct.

Make sure the brakes do not drag.
Replacement of brake components requires
professional knowledge. These procedures
should be performed by a Yamaha dealer.
EBU24491
Adjusting the rear 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 rear brake shoes for wear.
The brake lever free play should measure 5.0–8.0
mm (0.20–0.31 in) as shown. If the free play is in-
correct, adjust it as follows.
1. Locknut
2. Brake lever free play adjusting bolt
3. Brake lever free play
3
1
2
(b)
(a)

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NOTICE

ECB00550
If measurement “A” of the drive chain adjust-
ing bolt is less than 27 mm (1.06 in), have a
Yamaha dealer replace the drive chain.
6. Tighten the hub stopper bolt, and then its lock-
nut.
EBU24880
Lubricating the drive chain
The drive chain must be cleaned and lubricated at
the intervals specified in the periodic maintenance
and lubrication chart, otherwise it will quickly wear
out, especially when riding in dusty or wet areas.
Service the drive chain as follows. Tightening torques:
Chain adjusting bolt locknut:
15.5 Nm (1.6 m·kgf, 11.2 ft·lbf)
Axle holding bolt (upper):
85 Nm (8.5 m·kgf, 61.5 ft·lbf)
Axle holding bolt (lower):
60 Nm (6.0 m·kgf, 43.4 ft·lbf)
1. Measurement A
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accident or injury.
EBU24912
Checking and lubricating the front and
rear brake levers
The operation of the front and rear brake levers
should be checked before each ride, and the lever
pivots should be lubricated if necessary.
Front brake leverRear brake lever
EBU24962
Checking the wheel hub bearings
The front and rear wheel hub bearings must be
checked at the intervals specified in the periodic
maintenance and lubrication chart. If there is play
in a wheel hub or if a wheel does not turn smoothly,
have a Yamaha dealer check the wheel hub bear-
ings.
EBU25032
Lubricating the upper and lower arm
pivots
The upper and lower arm pivots must be lubricated
at the intervals specified in the periodic mainte- Recommended lubricant:
Silicone grease

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nance and lubrication chart.
Lubricate the pivoting points using a grease gun.
Left sideRight side
EBU28821
Lubricating the front knuckle pivots
The front knuckle pivots must be lubricated at the
intervals specified in the periodic maintenance and
lubrication chart.
Lubricate the front knuckle pivots using a grease
gun. Recommended lubricant:
Lithium-soap-based grease
1. Grease nipple
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1. Grease nipple
Recommended lubricant:
Lithium-soap-based grease (all-purpose
grease)
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