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

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TECHNICAL DATA

22.1

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 (All USA models)
Transmission ratio (SX‑F EU)
1st gear
2nd gear
3rd gear
4th gear
Transmission ratio (All USA models)
1st gear
2nd gear
3rd gear
4th gear
5th gear
Alternator
Ignition
Spark plug
Spark plug electrode gap
Cooling
Starting aid
22.2

Engine tightening torques

Screw, cable holder in alternator cover
Screw, oil jet for piston cooling
Screw, stator
Oil nozzle, piston cooling
Oil nozzle, rocker arm lubrication
Screw, bearing retainer
Screw, clutch spring retainer
Screw, crankshaft position sensor
Screw, locking lever
1-cylinder 4-stroke engine, water-cooled
449.3 cm³ (27.418 cu in)
63.4 mm (2.496 in)
95 mm (3.74 in)
12.6:1
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 grooved ball bearings
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
32:76
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, 75 W
Contactless controlled fully electronic ignition with digital igni-
tion adjustment
NGK LKAR8AI-9
0.9 mm (0.035 in)
Water cooling, permanent circulation of coolant by water pump
Electric starter
M4
M4
M4
M5
M5
M5
M5
M5
M5
4 Nm (3 lbf ft)
2 Nm (1.5 lbf ft)
4 Nm (3 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)
6 Nm (4.4 lbf ft)
Loctite ® 243™
Loctite ® 243™
Loctite ® 648™
Loctite ® 243™
Loctite ® 243™
Loctite ® 2701™
–
Loctite ® 243™
Loctite ® 243™
91