KTM 125 SX User Manual

16 TUNING THE ENGINE 102
B00056-11
–
Remove cap

, adjusting spring

, auxiliary spring

, and spring insert

from the clutch cover.
– Pull both springs off of the spring insert.
B02130-10
–
Mount the required auxiliary spring

and adjusting spring

and position them
together in the clutch cover.
Auxiliary spring with yellow marking (54637072300)
Auxiliary spring with green marking (54837072100)
Auxiliary spring with red marking (54837072000)
The recess in spring insert

engages in the angle lever.
Info
Screw

must not be turned as this would worsen the engine characteris-
tic.
– Check the O-ring in the cap.
– Position the cap.
– Mount and tighten the screws.
Guideline
Screw, exhaust control cover M5 6 Nm (4.4 lbf ft)

KTM 125 SX Specifications

General

Engine Type	1-cylinder, 2-stroke engine
Displacement	124.8 cm³
Bore/Stroke	54 mm / 54.5 mm
Starter	Kickstarter
Transmission	6-speed
Rear Suspension	WP XACT shock absorber with linkage
Front Brake	Disc brake
Rear Brake	Disc brake
Ground Clearance	375 mm
Seat Height	950 mm
Cooling	Liquid cooled
Front Suspension	WP XACT USD, Ø 48 mm
Fuel System	Carburetor
Clutch	Wet multi-disc clutch
Frame	Central double-cradle type in chrome-molybdenum steel