KTM 125 SX 2023 User Manual

COOLING SYSTEM 14
101
Warning
Danger of poisoning Coolant is harmful to health.
– Keep coolant out of the reach of children.
– Do not allow coolant to come into contact with the skin, the eyes and clothing.
– Consult a doctor immediately if coolant is swallowed.
– Rinse the affected area immediately with plenty of water in the event of contact with the skin.
– Rinse eyes thoroughly with water and consult a doctor immediately if coolant gets into the eyes.
– Change clothing if coolant spills onto your clothing.
Condition
The engine is cold.
– Position the motorcycle upright.
– Place an appropriate container under the water pump cover.
S05545-11
–
Remove screw
1
. Take off radiator cap
2
.
– Completely drain the coolant.
–
Mount and tighten screw
1
with a new seal ring.
Guideline
Coolant drain plug M6 10 Nm (7.4 lbf ft)
14.5 Refilling with coolant
Warning
Danger of poisoning Coolant is harmful to health.
– Keep coolant out of the reach of children.
– Do not allow coolant to come into contact with the skin, the eyes and clothing.
– Consult a doctor immediately if coolant is swallowed.
– Rinse the affected area immediately with plenty of water in the event of contact with the skin.
– Rinse eyes thoroughly with water and consult a doctor immediately if coolant gets into the eyes.
– Change clothing if coolant spills onto your clothing.
S05546-10
Main work
–
Make sure that screw
1
is tightened.
– Position the motorcycle upright.

KTM 125 SX 2023 Specifications

General

Displacement	124.8 cm³
Bore x Stroke	54 mm x 54.5 mm
Starter	Electric starter
Transmission	6-speed
Front Suspension	WP XACT-USD, Ø 48 mm
Rear Suspension	WP XACT Monoshock with linkage
Front Brake	Disc brake
Rear Brake	Disc brake
Ground Clearance	375 mm
Seat Height	950 mm
Weight (without fuel)	87.5 kg
Cooling	Liquid cooled
Front Tire	80/100-21"
Rear Tire	100/90-19"
Front Brake Diameter	260 mm
Rear Brake Diameter	220 mm
Engine Type	Single-cylinder, 2-stroke
Frame	Central tube frame made of chrome molybdenum steel
Fuel Tank Capacity	7.2 liters

Summary

Safety Advice

Safe Operation

Ensures safe operation of the motorcycle, covering rider fitness, ventilation, and hot components.

Protective Clothing

Highlights the importance of wearing appropriate protective clothing for all rides to minimize injury risk.

Preparing for Use

Advice on Preparing for First Use

Essential advice for new riders, including reading the manual, knowing controls, and adjusting levers.

Running in the Engine

Guidance on the engine break-in process, specifying performance limits for initial operating hours.

Riding Instructions

Checks and Maintenance Measures When Preparing for Use

Pre-ride checks covering essential systems like oil, brakes, coolant, chain, tires, and fasteners.

Braking

Instructions on proper braking techniques, including force adjustment, brake system checks, and surface conditions.

Refueling

Tuning the Chassis

Adjusting the Spring Preload of the Shock Absorber

Step-by-step guide to adjust the shock absorber spring preload for optimal riding characteristics.

Adjusting the Fork Air Pressure

Service Work on the Chassis

Checking Steering Head Bearing Play

Adjusting the Chain Tension

Brake System

Checking the Front Brake Fluid Level

Changing the Brake Linings of the Front Brake

Step-by-step guide for replacing worn front brake linings.

Changing the Rear Brake Linings

Step-by-step guide for replacing worn rear brake linings.

Wheels, Tires

Service Work on the Engine

Changing the Gear Oil

Troubleshooting