TECHNICAL DATA 22
221
22.1 Engine
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 compression 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 transmission, claw shifted
Transmission ratio
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