TECHNICAL DATA 22
139
22.1 Engine
Design 1-cylinder 4-stroke engine, water-cooled
Displacement 349.7 cm³ (21.34 cu in)
Stroke 57.5 mm (2.264 in)
Bore 88 mm (3.46 in)
Compression ratio 13.5:1
Idle speed 1,950 … 2,050 rpm
Control DOHC, four valves controlled via cam lever, drive via
timing chain
Valve diameter, intake 36.3 mm (1.429 in)
Valve diameter, exhaust 29.1 mm (1.146 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 Plain 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 2 trochoidal
pumps
Primary transmission 24:73
Clutch Multidisc clutch in oil bath/hydraulically activated
Gearbox 6 gear transmission, claw shifted
Transmission ratio
first-gear 14:32
second-gear 16:26
third-gear 20:25
fourth-gear 22:23
fifth-gear 25:22
sixth-gear 26:20
Alternator 12 V, 200 W
Ignition Contactless controlled fully electronic ignition with
digital ignition adjustment
Spark plug NGK LMAR9AI-10
Spark plug electrode gap 1.0 mm (0.039 in)
Cooling Water cooling, permanent circulation of coolant by
water pump
Starting aid Starter motor
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