21 TECHNICAL DATA 203
21.1 Engine
21.1.1 125 Duke
Design 1-cylinder 4-stroke engine, water-cooled
Displacement 125 cm³ (7.63 cu in)
Stroke 47.2 mm (1.858 in)
Bore 58 mm (2.28 in)
Compression ratio 12.8:1
Control DOHC, 4 valves controlled via cam lever, chain drive
Valve diameter, intake 22.5 mm (0.886 in)
Valve diameter, exhaust 19 mm (0.75 in)
Valve clearance, intake, cold 0.08… 0.12 mm (0.0031… 0.0047 in)
Valve clearance, exhaust, cold 0.13… 0.17 mm (0.0051… 0.0067 in)
Crankshaft bearing Two ball bearings
Conrod bearing Sleeve bearing
Pistons Cast light alloy
Piston rings 1 L-ring, 1 tapered compression piston ring, 1 oil scraper ring
Engine lubrication Pressure circulation lubrication with one rotary pump
Primary transmission 22:72
Clutch Clutch in oil bath/mechanically activated
Transmission 6-gear, claw shifted
Transmission ratio
1st gear 12:34
2nd gear 15:31
3rd gear 18:28
4th gear 21:26
5th gear 22:23
6th gear 24:22
Mixture preparation Electronically controlled fuel injection
Ignition Contactless controlled fully electronic ignition with digital igni-
tion adjustment
Alternator 12 V, 238 W
Spark plug BOSCH VR 5 NE
Spark plug electrode gap 0.8 mm (0.031 in)
Cooling Water cooling, permanent circulation of coolant by water pump
Idle speed 1,350… 1,450 rpm
Starting aid Electric starter
21.1.2 200 Duke
Design 1-cylinder 4-stroke engine, water-cooled
Displacement 200 cm³ (12.2 cu in)
Stroke 49 mm (1.93 in)
Bore 72 mm (2.83 in)
Compression ratio 11,5:1
Control DOHC, 4 valves controlled via cam lever, chain drive
Valve diameter, intake 28.5 mm (1.122 in)
Valve diameter, exhaust 24 mm (0.94 in)
Valve clearance, intake, cold 0.08… 0.12 mm (0.0031… 0.0047 in)
Valve clearance, exhaust, cold 0.13… 0.17 mm (0.0051… 0.0067 in)
Crankshaft bearing Two ball bearings
Conrod bearing Sleeve bearing
Pistons Cast light alloy
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