KTM SXF450 2019

Engine

Design

 

1-cylinder 4-stroke engine, water-cooled

Displacement

449.9 cm³ (27.455 cu in)

Stroke

63.4 mm (2.496 in)

Bore

95 mm (3.74 in)

Compression ratio

12.75:1

Idle speed

2,250 … 2,350 rpm

Control

OHC, 4 valves controlled via rocker arm

Valve diameter, intake

40 mm (1.57 in)

Valve diameter, exhaust

33 mm (1.3 in)

Valve clearance

Intake at: 20 °C (68 °F)

0.10 … 0.15 mm (0.0039 … 0.0059 in)

Exhaust at: 20 °C (68 °F)

0.12 … 0.17 mm (0.0047 … 0.0067 in)

Crankshaft bearing

2 cylinder roller bearing

Conrod bearing

Slide bearing

Piston pin bearing

No bearing bush - DLC coated piston pin

Pistons

Forged light alloy

Piston rings

1 compression ring, 1 oil scraper ring

Engine lubrication

Pressure circulation lubrication with two Eaton pumps

Primary transmission

31:76

Clutch

Multidisc clutch in oil bath, hydraulically activated

Gearbox (SX-F EU)

4 gear transmission, claw shifted

Gearbox (SX-F US, XC-F US)

5 gear transmission, claw shifted

Transmission ratio (SX-F EU)

First gear

16:32

Second gear

18:30

Third gear

20:28

Fourth gear

22:26

Transmission ratio (SX-F US, XC-F US)

First gear

16:32

Second gear

18:30

Third gear

20:28

Fourth gear

22:26

Fifth gear

24:24

Alternator

12 V, 70 W

Ignition

Contactless controlled fully electronic ignition with digital ignition adjustment

Spark plug

NGK LMAR9AI-8

Spark plug electrode gap

0.8 mm (0.031 in)

Cooling

Water cooling, permanent circulation of coolant by water pump

Starting aid

Starter motor

Engine oil

1.20 l (1.27 qt.) – 10W50

Coolant

1.20 l (1.27 qt.)

Total fuel tank capacity, approx. (All SX-F models)

7 l (1.8 US gal)

Electric

12 V battery

 

Lithium-ion battery, Battery voltage: 12 V, 2.0 Ah, Maintenance-free

Fuse

10 A

Malfunction indicator lamp

LED

Remaining indicator lamps (XC-F US)

W2.3W / socket W2x4.6d – 12V

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

13:48

Chain

5/8 x 1/4"

Rear sprockets available

45, 47, 48, 49, 50, 51, 52

Steering head angle

63.9°

Wheelbase

1,485 ± 10 mm (58.46 ± 0.39 in)

Ground clearance, unloaded

370 mm (14.57 in)

Seat height, unloaded

950 mm (37.4 in)

Weight without fuel, approx. (SX-F EU)

100 kg (220 lb.)

Weight without fuel, approx. (SX-F US)

100.5 kg (221.6 lb.)

Weight without fuel, approx. (XC-F US)

101 kg (223 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.)