21 TECHNICAL DATA 98
21.1 Engine
Design 1-cylinder 4-stroke engine, water-cooled
Displacement 249.91 cm³ (15.2505 cu in)
Stroke 52.3 mm (2.059 in)
Bore 78 mm (3.07 in)
Compression ratio 14.4:1
Idle speed 2,250… 2,350 rpm
Control DOHC, four valves controlled via cam lever, drive via timing
chain
Valve diameter, intake 32.5 mm (1.28 in)
Valve diameter, exhaust 26.5 mm (1.043 in)
Valve clearance
Intake at: 20 °C (68 °F) 0.10… 0.15 mm (0.0039… 0.0059 in)
Exhaust at: 20 °C (68 °F) 0.13… 0.18 mm (0.0051… 0.0071 in)
Crankshaft bearing 2 cylinder bearings
Conrod bearing Slide bearing
Piston pin bearing Bearing bush
Pistons Forged light alloy
Piston rings 1 compression ring, 1 oil scraper ring
Engine lubrication Pressure circulation lubrication with two Eaton pumps
Primary transmission 24:73
Clutch Multidisc clutch in oil bath/hydraulically activated
Gearbox (All SX‑F models) 5-gear, claw shifted
Gearbox (XC‑F US) 6-gear, claw shifted
Transmission ratio (All SX‑F models)
1st gear 13:32
2nd gear 16:32
3rd gear 17:28
4th gear 19:26
5th gear 21:25
Transmission ratio (XC‑F US)
1st gear 13:32
2nd gear 16:30
3rd gear 16:24
4th gear 23:28
5th gear 23:23
6th gear 26:22
Alternator 12 V, 66 W
Ignition Contactless controlled fully electronic ignition with digital igni-
tion adjustment
Spark plug NGK LMAR9AI-8
Spark plug electrode gap 0.8 mm (0.031 in)
Cooling Water cooling, permanent circulation of coolant by water pump
Starting aid Electric starter
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