Technical Data; Engine; Engine Tightening Torques - KTM 450 SX-F 2018 Owner's Manual

21

TECHNICAL DATA

21.1

Engine

Design
Displacement
Stroke
Bore
Compression ratio
Idle speed
Control
Valve diameter, intake
Valve diameter, exhaust
Valve clearance
Intake at: 20 °C (68 °F)
Exhaust at: 20 °C (68 °F)
Crankshaft bearing
Conrod bearing
Piston pin bearing
Pistons
Piston rings
Engine lubrication
Primary transmission
Clutch
Gearbox (SX‑F EU)
Gearbox (SX‑F US, XC‑F US)
Transmission ratio (SX‑F EU)
First gear
Second gear
Third gear
Fourth gear
Transmission ratio (SX‑F US, XC‑F US)
First gear
Second gear
Third gear
Fourth gear
Fifth gear
Alternator
Ignition
Spark plug
Spark plug electrode gap
Cooling
Starting aid
21.2

Engine tightening torques

Screw, oil jet for piston cooling
Oil nozzle for clutch lubrication
Oil nozzle for timing chain lubrication
Oil nozzle, piston cooling
Oil nozzle, rocker arm lubrication
Pulse generator screw and cable
retainer
Screw, bearing retainer
Screw, clutch spring retainer
1-cylinder 4-stroke engine, water-cooled
449.9 cm³ (27.455 cu in)
63.4 mm (2.496 in)
95 mm (3.74 in)
12.75:1
2,250... 2,350 rpm
OHC, 4 valves controlled via rocker arm
40 mm (1.57 in)
33 mm (1.3 in)
0.10... 0.15 mm (0.0039... 0.0059 in)
0.12... 0.17 mm (0.0047... 0.0067 in)
2 cylinder roller bearing
Slide bearing
Not a bearing bush - DLC-plated piston pins
Forged light alloy
1 compression ring, 1 oil scraper ring
Pressure circulation lubrication with two Eaton pumps
31:76
Multidisc clutch in oil bath, hydraulically activated
4-gear, claw shifted
5-gear, claw shifted
16:32
18:30
20:28
22:26
16:32
18:30
20:28
22:26
24:24
12 V, 70 W
Contactless controlled fully electronic ignition with digital igni-
tion adjustment
NGK LMAR9AI-8
0.8 mm (0.031 in)
Water cooling, permanent circulation of coolant by water pump
Electric starter
M4
M5
M5
M5
M5
M5
M5
M5
2 Nm (1.5 lbf ft)
2 Nm (1.5 lbf ft)
2 Nm (1.5 lbf ft)
2 Nm (1.5 lbf ft)
2 Nm (1.5 lbf ft)
6 Nm (4.4 lbf ft)
6 Nm (4.4 lbf ft)
6 Nm (4.4 lbf ft)
Loctite ® 243™
Loctite ® 243™
Loctite ® 243™
Loctite ® 243™
Loctite ® 243™
Loctite ® 243™
Loctite 243™
®
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