KTM 125 DUKE 2021 User Manual

12 SERVICE WORK ON THE CHASSIS
124
12.12 Checking the chain tension
Warning
Danger of accidents Incorrect chain tension damages components and results in accidents.
If the chain is tensioned too much, the chain, engine sprocket, rear sprocket, transmission and rear
wheel bearings wear more quickly. Some components may break if overloaded.
If the chain is too loose, the chain may fall off the engine sprocket or the rear sprocket. As a result, the
rear wheel locks or the engine will be damaged.
– Check the chain tension regularly.
– Set the chain tension in accordance with the specification.
Preparatory work
– Raise the motorcycle with the rear lifting gear. ( p. 113)
M00714-10
Main work
– Shift the transmission into neutral.
– In the area after the chain sliding guard, press the chain
upward toward the link fork and measure chain tension
A
.
Info
Top chain section
B
must be taut.
Chain wear is not always even, so you should repeat
this measurement at different chain positions.
Chain tension 5 … 7 mm (0.2 … 0.28 in)

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