KTM SX125 2019

Engine

Design

 

1-cylinder 2-stroke engine, water-cooled, with reed intake and exhaust control

Displacement

124.8 cm³ (7.616 cu in)

Stroke

54.5 mm (2.146 in)

Bore

54 mm (2.13 in)

Exhaust valve - Beginning of adjustment

7,100 rpm

Crankshaft bearing

1 grooved ball bearing/1 roller bearing

Conrod bearing

Needle bearing

Piston pin bearing

Needle bearing

Pistons

Cast aluminum

Piston rings

1 rectangular ring, 1 half keystone ring

X (upper edge of piston to upper edge of cylinder)

0 … 0.10 mm (0 … 0.0039 in)

Z (height of control flap)

36.5 mm (1.437 in)

Primary transmission

23:73

Clutch

Multidisc clutch in oil bath/hydraulically activated

Gearbox

6-gear transmission, claw shifted

Transmission ratio

First gear

14:32

Second gear

15:30

Third gear

17:28

Fourth gear

19:27

Fifth gear

19:23

Sixth gear

22:24

Ignition

Contactless controlled fully electronic ignition with digital ignition adjustment, type Kokusan

Spark plug

NGK BR9 ECMVX

Spark plug electrode gap

0.60 mm (0.0236 in)

Starting aid

Kick starter system

Gear oil

0.80 l (0.85 qt.) – 15W50

Coolant

1.2 l (1.3 qt.)

Total fuel tank capacity, approx.

7.5 l (1.98 US gal)

Frame

Frame

 

Central tube frame made of chrome molybdenum steel tubing

Fork

WP Suspension Upside down AER 48

Suspension travel

 

front

310 mm (12.2 in)

rear

300 mm (11.81 in)

Fork offset

22 mm (0.87 in)

Shock absorber

WP Suspension 5018 DCC Link

Brake system

Disc brakes, floating brake calipers

Brake discs - diameter

 

front

260 mm (10.24 in)

rear

220 mm (8.66 in)

Brake discs - wear limit

 

front

2.5 mm (0.098 in)

rear

3.5 mm (0.138 in)

Offroad tire pressure

 

front

1.0 bar (15 psi)

rear

1.0 bar (15 psi)

Secondary ratio (All 125 models)

13:50

Secondary ratio (All 150 models)

13:48

Chain

5/8 x 1/4"

Rear sprockets available

48, 50, 52

Steering head angle

63.9°

Wheelbase

1,485 ± 10 mm (58.46 ± 0.39 in)

Seat height unloaded

950 mm (37.4 in)

Ground clearance unloaded

375 mm (14.76 in)

Weight without fuel, approx.

87.5 kg (192.9 lb.)

Maximum permissible front axle load

145 kg (320 lb.)

Maximum permissible rear axle load

190 kg (419 lb.)

Maximum permissible overall weight

335 kg (739 lb.)

Carburator

Carburetor type

 

MIKUNI TMX 38

Carburetor identification number

TMX 38 87

Needle position

2nd position from top

Jet needle

6BFY43-71 (6BFY42-71)

Main jet

500 (480, 490, 520, 540, 560)

Idling jet

35 (30 / 32.5 / 37.5 / 40)

Choke nozzle

80

Needle jet

S-7

Idle air adjusting screw

 

open

1.5 turns

 

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