YAMAHA YFZ50 2020 User Guide

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
EBU29681
LOCATION OF THE WARNING AND SPECIFICATION LABELS
EBU36153Read 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.UBW463E0.book Page 1 Monday, January 28, 2019 10:22 AM

1-2
1
7
15
6
2
4
3
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1
BD3-F816R-20
BW4-F816L-50
E10
E5
BW4-F817K-10
1
342
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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 JAPANYAMAHA
BW4-F155A-00
6
5
7
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1Familiarize 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
E10E5

**.* 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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EBU17432
SAFETY INFORMATION
SAFETY INFORMATION
EBU36352AN 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.UBW463E0.book Page 1 Monday, January 28, 2019 10:22 AM

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
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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2surfaces. 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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