KTM SX50 2019

Engine

Design

 

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

Displacement

49.0 cm³ (2.99 cu in)

Stroke

40 mm (1.57 in)

Bore

39.5 mm (1.555 in)

Crankshaft bearing

2 grooved ball bearings

Conrod bearing

Needle bearing

Piston pin bearing

Needle bearing

Pistons

Aluminum cast

Piston rings

1 rectangular ring

Engine lubrication (50 SX)

Mixture oil lubrication

Engine lubrication (50 SX Mini)

Separate lubrication

Primary transmission

33:61 straight cut spur gear

Clutch

Multi-disc automatic clutch on the main shaft/centrifugal force

Gearbox

Rigid 1-stage reduction gear

Transmission ratio

14:31

Ignition

SELETTRA 2p D36

Spark plug

NGK LR 8 B

Spark plug electrode gap

0.60 mm (0.0236 in)

Cooling

Water-cooled

Starting aid

Kickstarter

Carburator

Carburetor type

 

Dell`Orto PHBG 19BS

Needle position

2nd position from top

Idle air adjusting screw

 

Open

3 turns

Main jet

95

Jet needle

W7

Idling jet

50

Needle jet

262AU

Throttle slide

40

Cold start jet

60

Gear oil

0.20 l (0.21 qt.) – ATF Dexron 3

Coolant

0.7 l (0.7 qt.)

Fuel tank capacity, approx. (50 SX)

2.3 l (2.4 qt.)

Frame

Frame

 

Central tube frame of chrome molybdenum steel tubing, powder-coated

Fork (50 SX)

WP Performance Systems Upside down AER 35

Fork (50 SX Mini)

WP Performance Systems USD 35

Shock absorber (50 SX)

WP Performance Systems 3614 DCC

Shock absorber (50 SX Mini)

WP Performance Systems 3614 BAEM

Suspension travel (50 SX)

205 mm (8.07 in)

front

205 mm (8.07 in)

rear

185 mm (7.28 in)

Suspension travel (50 SX Mini)

 

front

100 mm (3.94 in)

rear

171 mm (6.73 in)

Fork offset

22 mm (0.87 in)

Brake system

 

front

Disc brake with four-pot brake caliper

rear

Disc brake with two-pot brake caliper

Brake disc diameters

 

front

160 mm (6.3 in)

rear

160 mm (6.3 in)

Brake discs - wear limits

 

front

2.2 mm (0.087 in)

rear

2.2 mm (0.087 in)

Tire air pressure off road

 

front

1.0 bar (15 psi)

rear

1.0 bar (15 psi)

Secondary drive ratio (50 SX)

11:40

Secondary drive ratio (50 SX Mini)

10:42

Chain

1/2 x 3/16”

Rear sprockets available

38, 39, 40, 41, 42

Steering head angle (50 SX)

66°

Steering head angle (50 SX Mini)

67.4°

Wheelbase (50 SX)

1,032 ± 10 mm (40.63 ± 0.39 in)

Wheelbase (50 SX Mini)

914 ± 10 mm (35.98 ± 0.39 in)

Seat height unloaded (50 SX)

684 mm (26.93 in)

Seat height unloaded (50 SX Mini)

558 mm (21.97 in)

Ground clearance unloaded (50 SX)

252 mm (9.92 in)

Ground clearance unloaded (50 SX Mini)

184 mm (7.24 in)

Weight without fuel, approx. (50 SX)

41.5 kg (91.5 lb.)

Weight without fuel, approx. (50 SX Mini)

40.5 kg (89.3 lb.)

 

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