KTM 450 SX-F 2023 User Manual

TECHNICAL DATA 22
145
22.1 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 13.1:1
Idle speed 2,100 … 2,200 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 Bearing bush
Pistons Forged light alloy
Piston rings 1 compression ring, 1 oil scraper ring
Engine lubrication Pressure circulation lubrication with 2 trochoidal
pumps
Primary transmission 29:72
Clutch Multidisc clutch in oil bath, hydraulically activated
Gearbox 5-gear transmission, claw shifted
Transmission ratio
first-gear 14:28
second-gear 16:26
third-gear 18:24
fourth-gear 21:24
fifth-gear 22:21
Alternator 12 V, 70 W
Ignition Contactless controlled fully electronic ignition with
digital ignition adjustment
Spark plug NGK LMAR9AI-10
Spark plug electrode gap 1.0 mm (0.039 in)
Cooling Water cooling, permanent circulation of coolant by
water pump
Starting aid Starter motor

KTM 450 SX-F 2023 Specifications

General

Engine Type	Single-cylinder, 4-stroke
Displacement	449.9 cc
Bore x Stroke	95 mm x 63.4 mm
Starter	Electric starter
Compression Ratio	13.1:1
Transmission	5-speed
Final Drive	Chain
Cooling	Liquid-cooled
Frame	Central Double-Cradle Type 25CrMo4 Steel
Front Suspension	WP XACT-USD, Ø 48 mm
Rear Suspension	WP XACT Monoshock with linkage
Ground Clearance	370 mm
Fuel System	Keihin EFI, 44 mm
Front Brake	260 mm disc
Rear Brake	220 mm disc
Fuel Tank Capacity	7.2 L