2021 YAMAHA YFZ50 Owners Manual

EBU17421
TABLE OF CONTENTS
VEHICLE IDENTIFICATION ............................ 1-1Identification numbers ................................ 1-1
LOCATION OF THE WARNING AND
SPECIFICATION LABELS .............................. 2-1
SAFETY INFORMATION ................................ 3-1
DESCRIPTION................................................ 4-1 Left view ...................................................... 4-1
Right view.................................................... 4-1
Controls and instruments............................ 4-2
INSTRUMENT AND CONTROL
FUNCTIONS ................................................... 5-1 Main switch ................................................. 5-1
Handlebar switches .................................... 5-1
Engine stop switch with lanyard ................. 5-2
Throttle lever ............................................... 5-3
Speed limiter ............................................... 5-3
Front brake lever ......................................... 5-5
Rear brake lever .......................................... 5-6
Parking brake .............................................. 5-6
Kickstarter ................................................... 5-7 Fuel tank cap .............................................. 5-8
Fuel ............................................................. 5-9
Fuel cock .................................................. 5-10
Starter (choke) ......................................... 5-12
Seat .......................................................... 5-13
Rear shock absorber ................................ 5-13
PRE-OPERATION CHECKS .......................... 6-1 Fuel ............................................................. 6-3
Engine oil .................................................... 6-3
Transmission oil .......................................... 6-3
Front and rear brakes ................................. 6-3
Throttle lever ............................................... 6-3
Drive chain .................................................. 6-3
Tires ............................................................ 6-3
Chassis fasteners ....................................... 6-6
Instruments and switches........................... 6-6
OPERATION .................................................. 7-1 Starting a cold engine................................. 7-1
Starting a warm engine............................... 7-3
Engine break-in........................................... 7-3
Parking........................................................ 7-3
Parking on a slope ...................................... 7-4UBW464E0.book Page 1 Thursday, January 23, 2020 2:42 PM

Accessories and loading ............................. 7-5
RIDING YOUR ATV ........................................ 8-1 GETTING TO KNOW YOUR ATV ................ 8-2
RIDE WITH CARE AND GOOD JUDGMENT .............................................. 8-2
BE CAREFUL WHERE YOU RIDE ............... 8-9
TURNING YOUR ATV................................ 8-12
CLIMBING UPHILL ................................... 8-13
RIDING DOWNHILL .................................. 8-16
CROSSING A SLOPE................................ 8-17
CROSSING THROUGH SHALLOW WATER .................................................... 8-18
RIDING OVER ROUGH TERRAIN ............. 8-20
SLIDING AND SKIDDING .......................... 8-20
WHAT TO DO IF... ..................................... 8-21
PERIODIC MAINTENANCE AND
ADJUSTMENT................................................ 9-1 Owner’s Manual and tool kit ....................... 9-2
Periodic maintenance chart: Emission control system .......................................... 9-3
Periodic maintenance chart: General maintenance and lubrication..................... 9-5
Removing and installing the panel .............. 9-9
Checking the spark plug ............................. 9-9
Engine oil................................................... 9-11 Why Yamalube.......................................... 9-14
Transmission oil ........................................ 9-15
Cleaning the air filter element ................... 9-16
Cleaning the spark arrester ...................... 9-19
Adjusting the carburetor ........................... 9-20
Adjusting the engine idling speed ............ 9-20
Adjusting the throttle lever free play ......... 9-22
Valve clearance......................................... 9-22
Brakes....................................................... 9-22
Checking the front and rear brake
shoes ...................................................... 9-23
Adjusting the front brake lever free play... 9-24
Adjusting the rear brake lever free play .... 9-26
Drive chain slack....................................... 9-26
Cleaning and lubricating the drive chain ....................................................... 9-29
Checking and lubricating the cables ........ 9-29
Checking and lubricating the front and rear brake levers ..................................... 9-30
Checking the wheel hub bearings ............ 9-30
Lubricating the front arm pivots ............... 9-31
Lubricating the front knuckle pivots ......... 9-31
Lubricating the steering shaft ................... 9-32
Battery ...................................................... 9-32
Replacing the fuse .................................... 9-35
Removing a wheel .................................... 9-36
Installing a wheel ...................................... 9-36
UBW464E0.book Page 2 Thursday, January 23, 2020 2:42 PM

Troubleshooting ........................................ 9-37
Troubleshooting chart ............................... 9-38
CLEANING AND STORAGE ......................... 10-1 Cleaning .................................................... 10-1
Storage...................................................... 10-2
SPECIFICATIONS ........................................ 11-1
INDEX ........................................................... 12-1
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1-1
1
EBU38860
VEHICLE IDENTIFICATION
EBU28205Identification numbersRecord the vehicle identification number and
model label information in the spaces provided
below.
VEHICLE IDENTIFICATION NUMBER:
MODEL LABEL INFORMATION:EBU26032Vehicle identification number
The vehicle identification number is stamped into
the frame. This 17-digit number is used to identify
your individual ATV.
EBU26053Model label
The model label is affixed at the location shown.1. Vehicle identification number
1
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1-2
1
Your specific model can be identified by checking
the model type code found on the model label.
1. Model label
1. Model type code
2. Production code
3. Color code
1
*
****
-
***1
3
2
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2-1
2
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.UBW464E0.book Page 1 Thursday, January 23, 2020 2:42 PM

2-2
2
7
15
6
2
4
3
UBW464E0.book Page 2 Thursday, January 23, 2020 2:42 PM

2-3
2
BD3-F816R-20
BW4-F816L-50
E10
E5
BW4-F817K-10
1
342
UBW464E0.book Page 3 Thursday, January 23, 2020 2:42 PM