Yamaha YFZ50 2019 User manual

DIC183
YFZ50
OWNER’S MANUAL
MANUEL DU PROPRIÉTAIRE
MANUAL DEL PROPIETARIO
BW4-F8199-63
READ THIS MANUAL CAREFULLY!
It contains important safety information.
LIRE ATTENTIVEMENT CE MANUEL!
Il comprend d’importantes informations de sécurité.
¡LEA ESTE MANUAL ATENTAMENTE!
Contiene indicaciones importantes acerca de la seguridad.

DIC183
Original instructions
Notice originale
Manual original
PRINTED IN TAIWAN
2019.01
(E,F,S)

READ THIS MANUAL CAREFULLY!
It contains important safety information.
WARNING
OWNER’S MANUAL
YFZ50
This ATV should not be ridden by anyone under 6 years of age.
BW4-F8199-63-E0
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EBU28981
Read this manual carefully before operating this vehicle. This manual should stay with this ve-
hicle if it is sold.
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EBU17171
INTRODUCTION
EBU17203
Congratulations on your purchase of the Yamaha YFZ50. This ATV represents the result of many years of
Yamaha experience in the production of fine sporting, touring, and pacesetting racing machines. With the
purchase of this Yamaha, you can now appreciate the high degree of craftsmanship and reliability that
have made Yamaha a leader in these fields.
This manual will provide you with a good basic understanding of the features and operation of this ATV.
This manual includes important safety information. It provides information about special tech-
niques and skills necessary to ride the ATV. It also includes basic maintenance and inspection proce-
dures. If you have any questions regarding the operation or maintenance of your ATV, please consult a
Yamaha dealer.
AN IMPORTANT SAFETY MESSAGE:
Read this manual completely before operating your ATV. Make sure you understand all instructions.
Pay close attention to the warning and notice labels on the ATV.
This ATV should not be operated by a child under 6 years of age.
AN IMPORTANT NOTE TO PARENTS:
This ATV is not a toy. Before you let your child ride this ATV, you should understand the instructions and
warnings in this Owner’s Manual. Then be sure your child understands and will follow them. Children differ
in skills, physical abilities and judgment. Some children may not be able to operate an ATV safely. Parents
should supervise their child’s use of the ATV at all times. Parents should permit continued use only if they
determine that the child has the ability to operate the ATV safely.
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Your ATV was delivered with an adjustable speed limiter. Yamaha recommends that all beginners start off
to limit the amount of speed available while they learn. The adjusting screw may be gradually turned out
as the beginner becomes more familiar with operating the ATV. Parents should decide when to adjust the
ATV for more power as their youngster’s riding skills improve. Once the ATV rider can operate with skill at
the top speed permitted by adjusting the vehicle speed limiter alone, the engine speed limiter plate can be
removed. Since removal of this limiter will result in a significant increase in power, turn the vehicle speed
limiter adjusting screw completely back in again; adjust it out in stages as done previously.
If your child is a beginner or is inexperienced, he or she should take a training course.
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EBU17331
IMPORTANT MANUAL INFORMATION
EBU17344
FAILURE TO FOLLOW THE WARNINGS CONTAINED IN THIS MANUAL CAN RESULT IN SERIOUS IN-
JURY OR DEATH.
Particularly important information is distinguished in this manual by the following notations:
TIP
Product and specifications are subject to change without notice.
The ATV you have purchased may differ slightly from the figures shown in this manual.
This is the safety alert symbol. It is used to alert you to potential per-
sonal injury hazards. Obey all safety messages that follow this sym-
bol to avoid possible injury or death.
A WARNING indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
A NOTICE indicates special precautions that must be taken to avoid
damage to the vehicle or other property.
A TIP provides key information to make procedures easier or clearer.
WARNING
NOTICE
TIP
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EBU17351
IMPORTANT NOTICE
EBU38310
THIS MACHINE IS DESIGNED STRICTLY FOR COMPETITION USE, ONLY ON A CLOSED COURSE.
This ATV is designed and manufactured for use on unpaved surfaces only. It is unsafe to operate this ATV
on any paved surface, paved street, paved road or motorway.
Please check your local riding laws and regulations before operating this ATV.
EBU33790
YFZ50
OWNER’S MANUAL
©2020 by Yamaha Motor Co., Ltd.
1st edition, December 2018
All rights reserved.
Any reprinting or unauthorized use
without the written permission of
Yamaha Motor Co., Ltd.
is expressly prohibited.
Printed in Taiwan.
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EBU17421
TABLE OF CONTENTS
LOCATION OF THE WARNING AND
SPECIFICATION LABELS ..............................1-1
SAFETY INFORMATION ................................2-1
DESCRIPTION................................................ 3-1
Left view......................................................3-1
Right view.................................................... 3-1
Controls and instruments............................ 3-2
INSTRUMENT AND CONTROL
FUNCTIONS................................................... 4-1
Main switch ................................................. 4-1
Handlebar switches ....................................4-1
Engine stop switch with lanyard ................. 4-2
Throttle lever ............................................... 4-3
Speed limiter ............................................... 4-3
Front brake lever ......................................... 4-5
Rear brake lever .......................................... 4-6
Parking brake .............................................. 4-6
Kickstarter...................................................4-7
Fuel tank cap ..............................................4-8
Fuel ............................................................. 4-9
Fuel cock...................................................4-10
Starter (choke) ......................................... 4-12
Seat .......................................................... 4-13
Rear shock absorber ................................ 4-13
PRE-OPERATION CHECKS .......................... 5-1
Fuel ............................................................. 5-3
Engine oil .................................................... 5-3
Transmission oil.......................................... 5-3
Front and rear brakes ................................. 5-3
Throttle lever............................................... 5-3
Drive chain.................................................. 5-3
Tires ............................................................ 5-3
Chassis fasteners ....................................... 5-6
Instruments and switches........................... 5-6
OPERATION .................................................. 6-1
Starting a cold engine................................. 6-1
Starting a warm engine............................... 6-3
Engine break-in........................................... 6-3
Parking........................................................ 6-3
Parking on a slope...................................... 6-4
Accessories and loading ............................ 6-5
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RIDING YOUR ATV ........................................7-1
GETTING TO KNOW YOUR ATV ................7-2
RIDE WITH CARE AND GOOD
JUDGMENT ..............................................7-2
BE CAREFUL WHERE YOU RIDE...............7-9
TURNING YOUR ATV................................7-12
CLIMBING UPHILL ...................................7-13
RIDING DOWNHILL ..................................7-16
CROSSING A SLOPE................................7-17
CROSSING THROUGH SHALLOW
WATER....................................................7-18
RIDING OVER ROUGH TERRAIN .............7-20
SLIDING AND SKIDDING.......................... 7-20
WHAT TO DO IF........................................7-21
WHAT TO DO............................................7-22
PERIODIC MAINTENANCE AND
ADJUSTMENT................................................8-1
Owner’s Manual and tool kit .......................8-2
Periodic maintenance chart: Emission
control system ..........................................8-3
Periodic maintenance chart: General
maintenance and lubrication.....................8-5
Removing and installing the panel ..............8-9
Checking the spark plug .............................8-9
Engine oil................................................... 8-11
Why Yamalube ..........................................8-14
Transmission oil........................................ 8-15
Cleaning the air filter element ................... 8-16
Cleaning the spark arrester ...................... 8-19
Adjusting the carburetor ........................... 8-20
Adjusting the engine idling speed ............ 8-20
Adjusting the throttle lever free play......... 8-22
Valve clearance......................................... 8-22
Brakes....................................................... 8-22
Checking the front and rear brake
shoes ...................................................... 8-23
Adjusting the front brake lever free play... 8-24
Adjusting the rear brake lever free play.... 8-26
Drive chain slack....................................... 8-26
Cleaning and lubricating the drive
chain ....................................................... 8-29
Checking and lubricating the cables ........ 8-29
Checking and lubricating the front and
rear brake levers ..................................... 8-30
Checking the wheel hub bearings ............ 8-30
Lubricating the front arm pivots ............... 8-31
Lubricating the front knuckle pivots ......... 8-31
Lubricating the steering shaft ................... 8-32
Battery ...................................................... 8-32
Replacing the fuse.................................... 8-35
Removing a wheel .................................... 8-36
Installing a wheel ...................................... 8-36
Troubleshooting........................................ 8-37
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Troubleshooting chart...............................8-38
CLEANING AND STORAGE ........................... 9-1
Cleaning ...................................................... 9-1
Storage........................................................ 9-2
SPECIFICATIONS ........................................10-1
CONSUMER INFORMATION .......................11-1
Identification numbers ..............................11-1
INDEX........................................................... 12-1
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1-1
1
EBU29681
LOCATION OF THE WARNING AND SPECIFICATION LABELS
EBU36153
Read and understand all of the labels on your ATV. These labels contain important information for safe and
proper operation.
Never remove any labels from your ATV. If a label becomes difficult to read or comes off, request a re-
placement label from your Yamaha dealer.
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1-2
1
7
1
56
2 43
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1-3
1
BD3-F816R-20
BW4-F816L-50
E10E5
BW4-F817K-10
1
34
2
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1-4
1
BD3-F816P-50
15 kPa
0.15 kgf/cm²
2.2 psi
15 kPa
0.15 kgf/cm²
2.2 psi
BW4-F816M-N0
YAMAHA MOTOR CO., LTD.
SHIZUOKA JAPAN
YAMAHA
BW4-F155A-00
65
7
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1-5
1
Familiarize yourself with the following pictograms and read the explanatory text, then make sure to check
the pictograms that apply to your model.
Read the Owner’s manual.
ALWAYS use an approved helmet and
protective gear.
Use from 16 years old.
Operating this ATV if you are under the age
of 16 increases your chance of severe injury
or death.
Use from 6 years old.
Operating this ATV if you are under the age
of 6 increases your chance of severe injury
or death.
Adult supervision required for children under
age 16.
Use from 10 years old.
Operating this ATV if you are under the age
of 10 increases your chance of severe injury
or death.
Adult supervision required for children under
age 16.
NEVER use on paved roads.
NEVER carry passengers.
NEVER use with drugs or alcohol.
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1-6
1
E10
E5 **.* kPa
*.** kgf/cm²
*.* psi
**.* kPa
*.** kgf/cm²
*.* psi
This unit contains high-pressure nitrogen
gas.
Mishandling can cause an explosion. Do not
incinerate, puncture or open.
EN228 fuel identification mark.
Gasoline of ethanol 10% or less can be
used.
EN228 fuel identification mark.
Gasoline of ethanol 5% or less can be used.
Use unleaded gasoline only.
Measure the tire pressure when the tires are
cold.
Adjust the tire pressure.
Improper tire pressure can cause loss of
control.
Loss of control can result in severe injury or
death.
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2-1
2
EBU17432
SAFETY INFORMATION
SAFETY INFORMATION
EBU36352
AN ATV IS NOT A TOY AND CAN BE HAZARD-
OUS TO OPERATE.
An ATV handles differently from other vehicles, in-
cluding motorcycles and cars. A collision or roll-
over can occur quickly, even during routine
maneuvers such as turning and riding on hills or
over obstacles, if you fail to take proper precau-
tions.
SEVERE INJURY OR DEATH can result if you do
not follow these instructions:
Read this manual and all labels carefully and fol-
low the operating procedures described.
Never operate an ATV without proper training or
instruction. Take a training course. Beginners
should receive training from a certified instruc-
tor. Contact an authorized ATV dealer to find
out about the training courses nearest you.
Always follow the age recommendation:
– A child under 6 years old should never operate
an ATV with engine size greater than 50 cc.
– A child under 12 years old should never oper-
ate an ATV with engine size greater than 70 cc.
– A child under 16 years old should never oper-
ate an ATV with engine size greater than 90 cc.
Never allow a child under age 16 to operate an
ATV without adult supervision, and never allow
continued use of an ATV by a child if he or she
does not have the abilities to operate it safely.
Never carry a passenger on an ATV.
This vehicle is intended for off-road use only. Do
not operate on any paved surfaces such as:
sidewalks, driveways, parking lots, paved
roads, public streets or other motorway.
Watch carefully for other vehicles when operat-
ing on unpaved public streets or roads. Make
sure you know your country’s laws and regula-
tions before you ride on unpaved public streets
or roads.
Never operate an ATV without wearing an ap-
proved motorcycle helmet that fits properly.
You should also wear eye protection (goggles
or face shield), gloves, boots, a long-sleeved
shirt or a jacket, and long pants.
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2-2
2
Never consume alcohol or drugs before or while
operating this ATV.
Never operate at speeds too fast for your skills
or the riding conditions. Always go at a speed
that is proper for the terrain, visibility, operating
conditions, and your experience.
Never attempt wheelies, jumps, or other stunts.
Always inspect your ATV each time you use it to
make sure it is in safe operating condition. Al-
ways follow the inspection and maintenance
procedures and schedules described in this
manual.
Always keep both hands on the handlebars and
both feet on the footrests of the ATV during op-
eration.
Always go slowly and be extra careful when op-
erating on unfamiliar terrain. Always be alert to
changing terrain conditions when operating the
ATV.
Never operate on excessively rough, slippery or
loose terrain until you have learned and prac-
ticed the skills necessary to control the ATV on
such terrain. Always be especially cautious on
these kinds of terrain.
Always follow proper procedures for turning as
described in this manual. Practice turning at low
speeds before attempting to turn at faster
speeds and never turn at excessive speeds.
Never operate the ATV on hills too steep for the
ATV or for your abilities. Practice on smaller hills
before attempting larger hills.
Always follow proper procedures for climbing
hills as described in this manual. Check the ter-
rain carefully before you start up any hill. Never
climb hills with excessively slippery or loose
surfaces. Shift your weight forward. Never open
the throttle suddenly or make sudden gear
changes. Never go over the top of a hill at high
speed.
Always follow proper procedures for going
down hills and for braking on hills as described
in this manual. Check the terrain carefully before
you start down any hill. Shift your weight back-
ward. Never go down a hill at high speed. Avoid
going down a hill at an angle that would cause
the vehicle to lean sharply to one side. Go
straight down the hill where possible.
Always follow proper procedures for crossing
the side of a hill as described in this manual.
Avoid hills with excessively slippery or loose
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2-3
2
surfaces. Shift your weight to the uphill side of
the ATV. Never attempt to turn the ATV around
on any hill until you have mastered the turning
technique described in this manual on level
ground. Avoid crossing the side of a steep hill if
possible.
Always use proper procedures if you stall or roll
backwards when climbing a hill. If you stall or
roll backwards, follow the special procedure for
braking described in this manual. Dismount on
the uphill side or to a side if pointed straight up-
hill. Turn the ATV around and remount, following
the procedure described in this manual.
Always check for obstacles before operating in
a new area.
Never attempt to operate over large obstacles,
such as large rocks or fallen trees. Always follow
proper procedures when operating over obsta-
cles as described in this manual.
Always be careful when skidding or sliding.
Learn to safely control skidding or sliding by
practicing at low speeds and on level, smooth
terrain. On extremely slippery surfaces, such as
ice, go slowly and be very cautious in order to
reduce the chance of skidding or sliding out of
control.
Never operate an ATV in fast flowing water or in
water deeper than that recommended in this
manual. Remember that wet brakes may have
reduced stopping ability. Test your brakes after
leaving water. If necessary, apply them several
times to let friction dry out the linings.
Always use the size and type of tires specified in
this manual.
Always maintain proper tire pressure as de-
scribed in this manual.
Never exceed the stated load capacity for an
ATV. Cargo should be properly distributed and
securely attached. Reduce speed and follow in-
structions in this manual for carrying cargo or
pulling a trailer. Allow greater distance for brak-
ing.
Do not operate your ATV during darkness un-
less it is equipped with a properly functioning
headlight. Off-road riding is inherently danger-
ous and additionally, off-road trails do not have
streetlights to guide you.
Never maintain an ATV without proper knowl-
edge. Contact an authorized ATV dealer to in-
form you on basic ATV maintenance. Certain
maintenance can only be carried out by certified
staff.
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