2009 YAMAHA YFM50R engine

3-1
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DESCRIPTION
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Left view
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Right view
1. Fuel cock
2. Fuse
3. Engine stop switch with cord (lanyard)
4. Footboard
5. Drive select lever
1
3
4
5
2

1. Spark arrester
2. Seat
3. Footboard1
2
3

4-1
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INSTRUMENT AND CONTROL FUNCTIONS
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Main switch
The positions of the main switch are as follows:
ON
All electrical systems are supplied with power, and
the engine can be started. The key cannot be re-
moved.
OFF
All electrical systems are off. The key can be re-
moved.

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Indicator light
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Neutral indicator light “”
This indicator light comes on when the transmis-
sion is in the neutral position.
1. Main switch
OFF ON
1

1. Neutral indicator light “N”
1

4-2
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Handlebar switches
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Engine stop switch “ENG. STOP”
Set this switch to “RUN” before starting the engine.
The engine stop switch controls the ignition and
stops the engine when it is running. Use this switch
to stop the engine in an emergency situation. The
engine will not start or run when this switch is set
to “OFF”.
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Start switch “START”
Push this switch to crank the engine with the start-
er.
NOTICE
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See the starting instructions on page 6-1 prior
to starting the engine.
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Engine stop switch with lanyard
The clip must be attached to the engine stop
switch for the engine to run.
1. Engine stop switch “ENG. STOP”
2. Start switch “START”
12

4-3
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The lanyard should be held by putting your fingers
in the loop as shown.Should the ATV be separated from the parent by a
distance longer than the lanyard length, the lan-
yard will pull out the clip and stop the engine.
1. Engine stop switch
2. Clip
3. Lanyard
31
2

1. Lanyard
1

4-4
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34
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For further explanation of this switch and the lan-
yard, see “TEACHING YOUR CHILD TO OPER-
ATE THE ATV” in the “SAFETY INFORMATION”
section.
TIP


The engine cannot be started with the clip re-
moved.

When your child has developed sufficient skill to
no longer need you to follow with the lanyard,
the lanyard can be stowed under the seat of the
ATV. However, you must still closely supervise
your child at all times during ATV operation.
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Throttle lever
Once the engine is running, movement of the throt-
tle lever will increase the engine speed.
Regulate the speed of the ATV by varying the
throttle position. Because the throttle is spring-
loaded, the ATV will decelerate, and the engine will
return to an idle any time the hand is removed from
the throttle lever.
Before starting the engine, check the throttle to be
sure it is operating smoothly. Make sure it returns
to the idle position as soon as the lever is released.
1. Lanyard
1

1. Throttle lever
1

4-5
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34
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WARNING

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Malfunction of the throttle could make it diffi-
cult to speed up or slow down when you need
to. This could cause an accident. Check the op-
eration of the throttle lever before you start the
engine. If the throttle does not work smoothly,
check for the cause. Correct the problem be-
fore riding the ATV or consult a Yamaha dealer.
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Speed limiter
Your ATV was delivered with an adjustable speed
limiter. Yamaha recommends that all beginning
riders start off with the speed limiter adjusting
screw fully turned in to limit the amount of speed
available while they learn.
The speed limiter keeps the throttle from fully
opening, even when the throttle lever is pushed to
the maximum. The adjusting screw may be gradu-
ally turned out as the beginner becomes more fa-
miliar with operating the ATV.
1. Loosen the locknut.
2. To increase the maximum engine power avail-
able and the maximum speed of the ATV, turn
the adjusting screw in direction (a). To de-crease the maximum engine power available
and the maximum speed of the ATV, turn the
adjusting screw in direction (b).
3. Tighten the locknut.
WARNING

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Improper adjustment of the speed limiter and
throttle could cause throttle cable damage or
improper throttle operation. The child could
lose control, have an accident or be injured. Do
not turn the adjusting screw out more than 12
1. Locknut
2. Adjusting screw
3. No more than 12 mm (0.47 in)
1
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(b)
(a)

4-6
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mm (0.47 in) or the throttle cable could be dam-
aged.
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Front brake lever
The front brake lever is located on the right handle-
bar. To apply the front brake, pull the brake lever
toward the handlebar grip.
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Rear brake lever
The rear brake lever is located on the left handle-
bar. To apply the rear brake, pull the brake lever to-
ward the handlebar grip.
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Parking brake
Use the parking brake before starting the engine or
parking the ATV, especially on a slope. Apply the
rear brake lever and push down the lock plate to
apply the parking brake. Squeeze the rear brake
lever to release the parking brake.
1. Front brake lever
1

1. Rear brake lever
1

4-7
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WARNING

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Always set the parking brake before starting
the engine. The ATV could start moving un-
expectedly if the parking brake is not ap-
plied. This could cause loss of control or a
collision.

Always be sure you have released the park-
ing brake before you begin to ride. The brake
could overheat if you ride the ATV without re-
leasing the parking brake. You could lose
braking performance which could cause an
accident. You could also wear out the brakes
prematurely.
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Drive select lever
The drive select lever is located on the left side of
the engine. Use the drive select lever to shift the
transmission into drive or neutral.
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Fuel tank cap
Remove the fuel tank cap by turning it counter-
clockwise.
1. Parking brake lock plate
1

1. Drive select lever
2. Drive position
3. Neutral position
1
2
3