KTM 125 SX 2021 User Manual

WHEELS, TIRES 13
95
H03001-10
Main work
– Check the wheel bearing for damage and wear.
» If the wheel bearing is damaged or worn:
– Change the rear wheel bearing.
–
Clean and grease shaft seal rings
1
and contact surfaces
A
of the spacers.
Long-life grease ( p. 143)
– Insert the spacers.
–
Clean and grease the wheel spindle.
Long-life grease ( p. 143)
H00006-10
–
Position rear wheel and insert wheel spindle
2
.
The brake linings are correctly positioned.
– Mount the chain.
H00007-10
–
Position chain adjuster
3
. Mount nut
4
, but do not tighten
it yet.
–
Make sure that chain adjusters
3
are fitted correctly on
adjusting screws
5
.
– Check the chain tension. ( p. 70)
–
Tighten nut
4
.
Guideline
Nut, rear wheel spin-
dle
M25x1.5 80 Nm (59 lbf ft)
Info
The wide adjustment range of the chain adjusters
(32 mm (1.26 in)) enables different secondary ratios
with the same chain length.
Chain adjusters
3
can be turned by 180°.
– Operate the foot brake lever repeatedly until the brake lin-
ings are in contact with the brake disc and there is a pressure
point.
Finishing work
– Remove the motorcycle from the lift stand. ( p. 49)

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