22 TECHNICAL DATA
218
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, four 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 0.10 … 0.15 mm (0.0039 … 0.0059 in)
Valve clearance, exhaust, cold 0.15 … 0.20 mm (0.0059 … 0.0079 in)
Crankshaft bearing Two ball bearings
Conrod bearing Sleeve bearing
Pistons Cast light alloy
Piston rings One compression ring, one tapered compression pis-
ton ring, one oil scraper ring
Engine lubrication Pressure circulation lubrication with one trochoidal
pump
Primary transmission 22:72
Clutch Clutch in oil bath/mechanically activated
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