23 TECHNICAL DATA 171
23.1 Engine
Design 1-cylinder 4-stroke engine, water-cooled
Displacement 373 cm³ (22.76 cu in)
Stroke 60 mm (2.36 in)
Bore 89 mm (3.5 in)
Compression ratio 12.6:1
Control DOHC, 4 valves controlled via cam lever, chain drive
Valve diameter, intake 36 mm (1.42 in)
Valve diameter, exhaust 29 mm (1.14 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 2 slide bearings
Conrod bearing Sleeve bearing
Pistons Forged light alloy
Piston rings 1 compression ring, 1 tapered compression piston ring, 1 oil
scraper ring
Engine lubrication Pressure circulation lubrication with two rotary pumps
Primary transmission 30:80
Clutch Clutch in oil bath/mechanically activated
Transmission 6-gear, claw shifted
Transmission ratio
1st gear 12:32
2nd gear 14:26
3rd gear 19:27
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