2009 YAMAHA YFM50R maintenance

8-19
1
2
3
4
5
6
78
9
10
11
TIP

If the specified idling speed cannot be obtained as
described above, have a Yamaha dealer make the
adjustment.
EBU27071
Checking the throttle cable free play
The throttle cable free play should be checked at
the intervals specified 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, have a Yamaha dealer adjust it.
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.
1. Throttle stop screw
Engine idling speed:
1750–1850 r/min
1 (a) (b)

1. Throttle lever free play
1

8-20
1
2
3
4
5
6
78
9
10
11

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
1
2

8-21
1
2
3
4
5
6
78
9
10
11
Rear brake

EBU24330
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 10.0–
12.0 mm (0.39–0.47 in) as shown. If the free play
is incorrect, adjust it as follows.
1. Loosen the upper locknut and fully turn in the
upper adjusting bolt.
2. Loosen the lower locknut.
3. Turn the lower adjusting bolt in direction (a) to
increase the free play, and in direction (b) to
decrease it.
1. Wear limit mark
2. Wear indicator
1
2

1. Brake lever free play
1

8-23
1
2
3
4
5
6
78
9
10
11

should be performed by a Yamaha dealer.
EBU24451
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 7.0–
10.0 mm (0.28–0.39 in) as shown. If the free play
is incorrect, adjust it as follows.
1. Loosen the locknut at the brake lever.
2. Turn the brake lever free play adjusting bolt at
the brake lever in direction (a) to increase the
free play, and in direction (b) to decrease it.
3. Tighten the locknut at the brake lever.
If the specified free play cannot be obtained,
proceed with the following steps.
4. Loosen the locknut at the brake lever.
5. Fully turn the adjusting bolt at the brake lever
in direction (a) to loosen the brake cable.
6. To increase the brake lever free play, turn the
1. Locknut
2. Brake lever free play adjusting bolt
3. Brake lever free play
312
(a)
(b)

8-25
1
2
3
4
5
6
78
9
10
11
WARNING

EWB02130
Inspect cables frequently and replace if dam-
aged. Corrosion can result when the cable
sheaths become damaged, and cables can
also become frayed or kinked, which could re-
strict the operation of controls and lead to an
accident or injury.
EBU28702
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.
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.
EBU28822
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
Recommended lubricant:
Lithium-soap-based grease

1. Grease nipple
1

8-26
1
2
3
4
5
6
78
9
10
11

EBU25102
Lubricating the steering shaft
The steering shaft must be lubricated at the inter-
vals specified in the periodic maintenance and lu-
brication chart.
EBU25121
Battery
A poorly maintained battery will corrode and dis-
charge quickly. The electrolyte level, battery lead
connections and breather hose routing should be
checked before each ride and at the intervals
specified in the periodic maintenance and lubrica-
tion chart.
To check the electrolyte level
1. Place the ATV on a level surface.
2. Check the electrolyte level in the battery.
TIP

The electrolyte should be between the minimum
and maximum level marks.
3. If the electrolyte is at or below the minimum
level mark, add distilled water to raise it to themaximum level mark.NOTICE

ECB00590
Use only distilled water, as tap water contains
minerals that are harmful to the battery.WARNING
EWB02160
Battery electrolyte is poisonous and danger-
ous, as it contains sulfuric acid, which can
cause severe burns. Avoid contact with skin,
eyes or clothing. Always shield your eyes
Recommended lubricant:
Lithium-soap-based grease
1. Maximum level mark
2. Minimum level mark
1
2

INDEX
A
Accessories and loading ................................................ 6-7
Air filter element, cleaning ............................................ 8-13
B
Battery .................................................................. 5-6
,
8-26
Brake lever free play, adjusting the front...................... 8-21
Brake lever free play (rear), adjusting .......................... 8-23
Brake lever, front ............................................................ 4-6
Brake lever, rear............................................................. 4-6
Brake levers, checking and lubricating......................... 8-25
Brakes, front and rear .................................................... 5-3
Brake shoes, checking the front and rear .................... 8-20
C
Cables, checking and lubricating ................................. 8-24
Carburetor, adjusting.................................................... 8-18
Chassis fasteners........................................................... 5-6
Choke ........................................................................... 4-10
Cleaning ......................................................................... 9-1
D
Drive select lever............................................................ 4-7
E
Engine break-in .............................................................. 6-5
Engine, cold start ........................................................... 6-1
Engine idling speed ...................................................... 8-18
Engine oil ............................................................... 5-3
,
8-9
Engine, starting a warm ................................................. 6-3Engine stop switch ......................................................... 4-2
Engine stop switch with lanyard ..................................... 4-2
F
Final gear oil......................................................... 5-3
,
8-12
Front knuckle pivots, lubricating ................................... 8-25
Fuel ........................................................................ 4-8
,
5-3
Fuel cock ........................................................................ 4-9
Fuel tank cap.................................................................. 4-7
Fuse, replacing............................................................. 8-28
H
Handlebar switches ........................................................ 4-2
I
Identification numbers .................................................. 11-1
Indicator light .................................................................. 4-1
Instruments, lights and switches .................................... 5-6
K
Key identification number ............................................. 11-1
L
Label locations ............................................................... 2-1
M
Main switch .................................................................... 4-1
Maintenance and lubrication chart ................................. 8-5
Maintenance chart, emission control system ................. 8-3
Model label ................................................................... 11-2
N
Neutral indicator light ..................................................... 4-1