22 TECHNICAL DATA
128
22.1 Engine
Design 1-cylinder 4-stroke engine, water-cooled
Displacement 449.9 cm³ (27.455 cu in)
Stroke 63.4 mm (2.496 in)
Bore 95 mm (3.74 in)
Compression ratio 12.75:1
Idle speed 2,250 … 2,350 rpm
Control OHC, 4 valves controlled via rocker arm
Valve diameter, intake 40 mm (1.57 in)
Valve diameter, exhaust 33 mm (1.3 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) 0.12 … 0.17 mm (0.0047 … 0.0067 in)
Crankshaft bearing 2 cylinder roller bearing
Conrod bearing Slide bearing
Piston pin bearing No bearing bush – DLC coated piston pin
Pistons Forged light alloy
Piston rings 1 compression ring, 1 oil scraper ring
Engine lubrication Pressure circulation lubrication with two Eaton pumps
Primary transmission 31:76
Clutch Multidisc clutch in oil bath, hydraulically activated
Gearbox (SX‑F EU) 4 gear transmission, claw shifted
Gearbox (SX‑F US, XC‑F US) 5 gear transmission, claw shifted
Transmission ratio (SX‑F EU)
First gear 16:32
Second gear 18:30
Third gear 20:28
Fourth gear 22:26
Transmission ratio (SX‑F US, XC‑F US)
First gear 16:32
Second gear 18:30
Third gear 20:28
Fourth gear 22:26
Fifth gear 24:24
Alternator 12 V, 70 W
Ignition Contactless controlled fully electronic ignition with
digital ignition 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 Starter motor
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