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125 SX 2021
KTM 125 SX 2021 User Manual
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21
TECHNICAL
DATA
132
Info
Do
not
use
on
sandy
terrain.
21.3.6
Basic
carburetor
setting
for
sandy
surfaces
(150
SX)
Idle
air
adjusting
screw
Open
2
turns
Idling
jet
37.5
Jet
needle
6BFY42
‑
71
Needle
position
3rd
position
from
top
Main
jet
540
Info
If
the
engine
is
not
running
smoothly,
use
a
smaller
main
jet.
133
135
Table of Contents
Table of Contents
4
Means of Representation 1
7
Symbols Used
7
Formats Used
7
Safety Advice
8
Use Definition - Intended Use
8
Misuse
8
Degrees of Risk and Symbols
9
Tampering Warning
9
Safe Operation
9
Protective Clothing
10
Work Rules
10
Environment
10
Owner's Manual
11
Important Notes
12
Manufacturer Warranty, Implied Warranty
12
Fuel, Auxiliary Substances
12
Spare Parts, Accessories
12
Service
12
Figures
12
Customer Service
12
View of Vehicle 4
13
View of Vehicle, Front Left (Example)
13
View of Vehicle, Rear Right (Example)
14
Serial Numbers 5
15
Vehicle Identification Number
15
Type Label
15
Engine Number
15
Fork Part Number
15
Shock Absorber Article Number
16
Controls 6
17
Clutch Lever
17
Hand Brake Lever
17
Throttle Grip
17
Switch-Off Button
17
Start Button (125 XC US)
18
Service Hour Counter
18
Opening the Fuel Tank Filler Cap
18
Closing the Fuel Tank Filler Cap
19
Fuel Tap (All SX Models)
20
Fuel Tap (125 XC US)
20
Choke
21
Shift Lever
21
Kick Starter Lever
22
Foot Brake Lever
22
Plug-In Stand (All SX Models)
22
Side Stand (125 XC US)
22
Preparing for Use
24
Advice on Preparing for First Use
24
Running in the Engine
25
Starting Power of Lithium-Ion Batteries at Low Temperatures (125 XC US)
25
Preparing the Vehicle for Difficult Operating Conditions
26
Preparing the Vehicle for Riding on Dry Sand
26
Preparing the Vehicle for Riding on Wet Sand
28
Preparing the Vehicle for Riding on Wet and Muddy Circuits
29
Preparing Vehicle for High Temperatures or Slow Riding
30
Preparing the Vehicle for Low Temperatures or Snow
30
Riding Instructions
32
Checks and Maintenance Measures When Preparing for Use
32
Starting
32
Starting off
33
Shifting, Riding
34
Applying the Brakes
34
Stopping, Parking
35
Transporting
35
Refueling
36
Service Schedule
38
Additional Information
38
Required Work
38
Recommended Work
39
10 Tuning the Chassis
40
Checking the Basic Chassis Setting with Rider's Weight
40
Air Suspension XACT 5448
40
Compression Damping of the Shock Absorber
41
Adjusting the Low-Speed Compression Damping of the Shock Absorber
41
Adjusting the High-Speed Compression Damping of the Shock Absorber
42
Adjusting the Rebound Damping of the Shock Absorber
42
Measuring the Rear Wheel Dimension Unloaded
43
Checking the Static Sag of the Shock Absorber
44
Checking the Riding Sag of the Shock Absorber
44
Adjusting the Spring Preload of the Shock Absorber
45
Adjusting the Riding Sag
46
Checking the Basic Setting of the Fork
46
Adjusting the Fork Air Pressure
47
Adjusting the Compression Damping of the Fork
48
Adjusting the Rebound Damping of the Fork
48
Handlebar Position
49
Adjusting the Handlebar Position
49
Service Work on the Chassis 11
51
Raising the Motorcycle with a Lift Stand
51
Removing the Motorcycle from the Lift Stand
51
Bleeding the Fork Legs
52
Cleaning the Dust Boots of the Fork Legs
52
Removing the Fork Legs
53
Installing the Fork Legs
53
Removing the Fork Protector
54
Installing the Fork Protector
54
Removing the Lower Triple Clamp
54
Installing the Lower Triple Clamp
55
Checking Steering Head Bearing Play
57
Adjusting Steering Head Bearing Play
58
Lubricating the Steering Head Bearing
58
Removing the Start Number Plate
59
Installing the Start Number Plate
59
Removing Front Fender
59
Installing Front Fender
59
Removing the Shock Absorber
60
Installing the Shock Absorber
61
Removing the Seat
63
Mounting the Seat
63
Removing the Air Filter Box Cover
64
Installing the Air Filter Box Cover
65
Removing the Air Filter
65
Cleaning the Air Filter and Air Filter Box
66
Installing the Air Filter
67
Preparing Air Filter Box Cover for Securing
67
Removing the Main Silencer
67
Installing the Main Silencer
68
Changing the Glass Fiber Yarn Filling in the Main Silencer
68
Removing the Fuel Tank
69
Installing the Fuel Tank
70
Checking the Chain for Dirt
71
Cleaning the Chain
72
Checking the Chain Tension
72
Adjusting the Chain Tension
73
Checking the Chain, Rear Sprocket, Engine Sprocket, and Chain Guide
74
Checking the Frame
77
Checking the Link Fork
77
Checking Throttle Cable Routing
77
Checking the Rubber Grip
78
Adjusting the Basic Position of the Clutch Lever
79
Checking/Correcting the Fluid Level of the Hydraulic Clutch
79
Changing the Hydraulic Clutch Fluid
80
12 Brake System
82
Checking the Free Travel of the Hand Brake Lever
82
Adjusting the Basic Position of the Hand Brake Lever
82
Checking the Brake Discs
82
Checking the Front Brake Fluid Level
83
Adding Front Brake Fluid
84
Checking the Front Brake Linings
85
Changing the Front Brake Linings
85
Checking the Free Travel of Foot Brake Lever
88
Adjusting the Basic Position of the Foot Brake Lever
88
Checking the Rear Brake Fluid Level
89
Adding Rear Brake Fluid
89
Checking the Brake Linings of the Rear Brake
91
Changing the Rear Brake Linings
91
13 Wheels, Tires
94
Removing the Front Wheel
94
Installing the Front Wheel
95
Removing the Rear Wheel
95
Installing the Rear Wheel
96
Checking the Tire Condition
98
Checking Tire Pressure
98
Checking Spoke Tension
99
14 Electrical System
100
Removing the 12-V Battery (125 XC US)
100
Installing the 12 V Battery (125 XC US)
100
Charging the 12-V Battery (125 XC US)
101
Changing Main Fuse (125 XC US)
102
15 Cooling System
104
Radiator Cover
104
Installing the Radiator Cover
104
Removing the Radiator Cover
105
Checking the Antifreeze and Coolant Level
105
Checking the Coolant Level
106
Draining the Coolant
107
Refilling with Coolant
108
Changing the Coolant
109
Tuning the Engine 16
111
Checking Throttle Cable Play
111
Adjusting Throttle Cable Play
111
Carburetor Tuning
112
Carburetor - Idle Setting
114
Carburetor - Adjusting the Idle Speed
115
Plug-In Connector of Ignition Timing Map Adjustment
116
Changing the Ignition Timing Map
116
Checking the Basic Position of the Shift Lever
116
Adjusting the Basic Position of the Shift Lever
117
17 Service Work on the Engine
118
Emptying the Carburetor Float Chamber
118
Checking the Gear Oil Level
119
Changing the Gear Oil
119
Adding the Gear Oil
120
18 Cleaning, Care
122
Cleaning the Motorcycle
122
19 Storage
124
Preparing for Use after Storage
125
20 Troubleshooting
126
21 Technical Data
128
Engine
128
All 125 Models
128
Engine Tightening Torques
129
Carburetor
131
Carburetor Tuning (125 SX)
131
Carburetor - Basic Setting for Sandy Surfaces (All 125 Models)
132
Carburetor Tuning (150 SX)
133
Basic Carburetor Setting for Sandy Surfaces (150 SX)
134
125 XC Us
135
Carburetor Tuning (125 XC US)
135
Carburetor - Basic Setting for Sandy Surfaces (All 125 Models)
136
Capacities
137
Gear Oil
137
Coolant
137
Fuel
137
Chassis
137
Electrical System
138
Tires
138
Fork
138
All SX Models
138
XC Us
139
Shock Absorber
139
All SX Models
139
XC Us
140
Chassis Tightening Torques
141
Substances 22
143
Auxiliary Substances 23
145
Standards 24
147
25 List of Abbreviations
148
Index
149
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Setup Instructions
23 pages
4
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KTM 125 SX 2021 Specifications
General
Brand
KTM
Model
125 SX 2021
Category
Motorcycle
Language
English
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