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TECHNICAL DATA - ENGINE 70
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Design 1-cyliner 4-stroke engine, water-cooled
Displacement 449.3cm³ (27.42cuin)
Stroke 60.8mm (2.39in)
Bore 97mm (3.82in)
Compression ratio 12,5:1
Idle speed 1600… 1650rpm
Control 4 valves controlled by cam levers ad 2 camshafts, driven by heli-
cal gear pair and tooth-wheel chain
Valve diameter, intake 40.4mm (1.59in)
Valve diameter, exhaust 31.7mm (1.25in)
Valve clearance, cold, intake 0.07… 0.13mm (0.0028… 0.01in)
Valve clearance, cold, exhaust 0.12… 0.18mm (0.0047… 0.01in)
Crankshaft bearing 2 cylinder roller bearing
Conrod bearing Needle bearing
Piston pin bearing Bronze bush
Pistons Forged light alloy
Piston rings 1 compression ring, 1 oil scraper ring
Engine lubrication Pressure circulation lubrication with 3 rotor pumps
Primary transmission 29:74
Transmission ratio
1st gear 18:31
2nd gear 20:29
3rd gear 22:27
4th gear 24:25
5th gear 26:23
Generator 12V, 42W
Ignition Contactless controlled fully electronic ignition with digital igni-
tion adjustment, type Kokusan
Spark plug NGK CR 9 EKB
spark plug electrode gap 0.7mm (0.03in)
Cooling Water cooling, permanent circulation of coolant by water pump
Starting aid Electric starter
Capacity - engine oil
Engine oil 1.35l (1.43qt.) Engine oil (SAE 10W/50) ( P. 82)
Capacity - coolant
Coolant 1.2l (1.27qt.) Coolant ( P. 82)
Coolant (mixed ready to use) ( P. 82)