TECHNICAL DATA - ENGINE
204
Design
1-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
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 (450 SX ATV)
Bronze bush
Piston pin bearing (505 SX ATV)
not a bearing bush - DLC-plated piston pins
Pistons
Forged light alloy
Piston rings
1 compression ring, 1 oil scraper ring
Engine lubrication
Pressure circulation lubrication with 3 rotor pumps
Primary transmission
29:74
Clutch
Multidisc clutch in oil bath/hydraulically activated
Transmission ratio
1st gear
16:34
2nd gear
19:31
3rd gear
20:26
4th gear
23:25
5th gear
26:24
Alternator
12 V, 42 W
Ignition
Contactless controlled fully electronic ignition with digital igni-
tion adjustment
Spark plug
NGK CR 9 EKB
Spark plug electrode gap
0.7 mm (0.028 in)
Cooling
Water cooling, permanent circulation of coolant by water pump
Starting aid
Electric starter
28.1
Capacity - engine oil
Engine oil
2.00 l (2.11 qt.)
External temperature:
≥
0 °C
(
≥
32 °F)
Engine oil (SAE 10W/50)
External temperature: < 0 °C
(< 32 °F)
Engine oil (SAE 5W/40)
28.2
Capacity - coolant
Coolant
1.50 l (1.59 qt.)
Coolant (
Coolant (mixed ready to use) (
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