TECHNICAL DATA - ENGINE 160
Design Single cylinder 4-stroke engine, water-cooled
Displacement (450 SX ATV) 449.3 cm³ (27.418 cu in)
Displacement (505 SX ATV) 477.5 cm³ (29.139 cu in)
Stroke 60.8 mm (2.394 in)
Bore (450 SX ATV) 97 mm (3.82 in)
Bore (505 SX ATV) 100 mm (3.94 in)
Compression ratio 12.5:1
Idle speed 1,500… 1,600 rpm
Control DOHC, four valves controlled via cam lever, drive via helical gear
pair and tooth-wheel chain
Valve diameter, intake 40.4 mm (1.591 in)
Valve diameter, exhaust 31.7 mm (1.248 in)
Valve clearance, cold, intake 0.07… 0.13 mm (0.0028… 0.0051 in)
Valve clearance, cold, exhaust 0.12… 0.18 mm (0.0047… 0.0071 in)
Crankshaft bearing 2 cylinder roller bearing
Conrod bearing Needle bearing
Piston pin bearing Bronze bush
Pistons Forged light alloy
Piston rings 1 compression ring, 1 oil scraper ring
Engine lubrication Pressure circulation lubrication with 3 rotor pumps
Primary transmission 26:78 straight tooth spur gears
Clutch Multidisc clutch in oil bath/hydraulically activated
Transmission ratio
1st gear 16:34
2nd gear 19:31
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