KTM 125 DUKE 2021 User Manual

TROUBLESHOOTING 21
215
Faults Possible cause Action
The engine does not turn when
the start button is pressed
Operating error – Carry out start procedure. ( p. 90)
12-V battery discharged – Charge the 12-V battery. ( p. 167)
Fuse 1, 3, 4, or 7 is blown – Change the fuses of individual electri-
cal power consumers. ( p. 175)
No ground connection present – Check the ground connection.
Engine turns only if the clutch
lever is drawn
The vehicle is in gear – Shift the transmission into neutral.
The vehicle is in gear and the
side stand is folded out
– Shift the transmission into neutral.
Engine turns but does not start Operating error – Carry out start procedure. ( p. 90)
Malfunction in the electronic
fuel injection
– Read out the fault memory using the
KTM diagnostics tool.
Engine has too little power Air filter is very dirty – Change the air filter.
Fuel filter is very dirty – Check the fuel pressure.
Malfunction in the electronic
fuel injection
– Read out the fault memory using the
KTM diagnostics tool.
Engine overheats Too little coolant in cooling sys-
tem
– Check the cooling system for leakage.
– Check the coolant level. ( p. 187)
Radiator fins very dirty – Clean the radiator fins.
Foam formation in cooling sys-
tem
– Drain the coolant. ( p. 189)
– Fill/bleed the cooling system.
( p. 190)

KTM 125 DUKE 2021 Specifications

General

Displacement	124.7 cc
Bore x Stroke	58 mm x 47.2 mm
Compression Ratio	12.5:1
Transmission	6-speed
Rear Suspension	WP APEX Monoshock
Front Brake	Four-piston radial fixed caliper, brake disc
Rear Brake	Single-piston floating caliper, brake disc
Front Tire	110/70 R17
Rear Tire	150/60 R17
Seat Height	830 mm
Dry Weight	139 kg
Frame	Steel Trellis Frame, Powder Coated
Ground Clearance	175 mm
Engine Type	Single Cylinder, 4-Stroke, Liquid Cooled
Torque	12 Nm
Fuel System	Electronic Fuel Injection
Front Suspension	WP APEX 43
Fuel Tank Capacity	13.4 liters
Wheelbase	1, 357 mm