KTM 125 SX 2021 User Manual

7 PREPARING FOR USE
28
7.8 Preparing vehicle for high temperatures or slow riding
M01129-01
– Check the radiator cap.
Value on the radiator cap 1.8 bar (26 psi)
» If the indicated value does not correspond to the setpoint
value:
Warning
Danger of scalding During motorcycle oper-
ation, the coolant gets very hot and is under
pressure.
– Do not open the radiator, the radiator hoses
or other cooling system components if the
engine or the cooling system are at operat-
ing temperature.
– Allow the cooling system and the engine to
cool down before you open the radiator, the
radiator hoses or other components of the
cooling system.
– In the event of scalding, rinse the area
affected immediately with lukewarm water.
– Change the radiator cap.
600868-01
– Adjust the secondary drive to the road conditions.
Info
The engine oil heats up quickly when the clutch is
operated frequently due to an excessively high sec-
ondary ratio.
– Clean the chain.
Chain cleaner ( p. 143)
– Clean the radiator fins.
– Straighten the bent radiator fins carefully.
– Check the coolant level. ( p. 104)
7.9 Preparing the vehicle for low temperatures or snow
M01106-01
– Mount the air filter rain cover.
Air filter rain cover (79006921000)
Info
Observe the fitting instructions for KTM PowerParts.

KTM 125 SX 2021 Specifications

General

Engine Type	1-cylinder, 2-stroke engine
Displacement	124.8 cm³
Bore x Stroke	54 mm x 54.5 mm
Starter	Kickstarter
Transmission	6-speed
Front Suspension	WP XACT-USD, Ø 48 mm
Rear Suspension	WP XACT Monoshock with linkage
Cooling	Liquid cooled
Front Tire	80/100-21"
Rear Tire	100/90-19"
Seat Height	950 mm
Ground Clearance	375 mm
Frame	Central tube frame made of chrome molybdenum steel
Front Brake	Disc brake
Rear Brake	Disc brake
Fuel Tank Capacity	7.5 liters
Fuel System	Mikuni TMX carburetor