KTM 450 XC, Owner'S Manual

Page: 183 / 208

TECHNICAL DATA - ENGINE
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13 TECHNICAL DATA - ENGINE
Design 1-cylinder 4-stroke engine with balancer, water-cooled
Displacement (450 XC ATV) 448 cm³ (27.34 cu in)
Displacement (525 XC ATV) 510 cm³ (31.12 cu in)
Stroke 72 mm (2.83 in)
Bore (450 XC ATV) 89 mm (3.5 in)
Bore (525 XC ATV) 95 mm (3.74 in)
Compression ratio 11:1
Idle speed 1,500… 1,600 rpm
Control 4 valves controlled via rocker arm and overhead camshaft,
camshaft drive via simplex chain
Valve diameter, intake 35 mm (1.38 in)
Valve diameter, exhaust 30 mm (1.18 in)
Valve clearance, cold, intake 0.10… 0.15 mm (0.0039… 0.0059 in)
Valve clearance, cold, exhaust 0.10… 0.15 mm (0.0039… 0.0059 in)
Crankshaft bearing 2 cylinder roller bearing
Conrod bearing Needle bearing
Piston pin bearing Bronze bush
Pistons (450 XC ATV) Cast light alloy
Pistons (525 XC ATV) Forged light alloy
Piston rings 1 compression ring, 1 oil scraper ring
Engine lubrication Pressure circulation lubrication with 2 rotor pumps
Primary transmission 31:78 straight tooth spur gears
Clutch Multidisc clutch in oil bath / hydraulically activated
Transmission ratio
1st gear 14:35