23 TECHNICAL DATA 107
23.1 Engine
Design 1-cylinder 4-stroke engine, water-cooled
Displacement (All 450 models) 449.3 cm³ (27.418 cu in)
Displacement (All 501 models) 510.4 cm³ (31.147 cu in)
Stroke (All 450 models) 63.4 mm (2.496 in)
Stroke (All 501 models) 72 mm (2.83 in)
Bore 95 mm (3.74 in)
Compression ratio 11,8:1
Idle speed 1,800… 1,900 rpm
Control OHC, 4 valves controlled via rocker arm, drive via tooth/wheel
chain
Valve diameter, intake 40 mm (1.57 in)
Valve diameter, exhaust 33 mm (1.3 in)
Valve clearance
Exhaust at: 20 °C (68 °F) 0.12… 0.17 mm (0.0047… 0.0067 in)
Intake at: 20 °C (68 °F) 0.10… 0.15 mm (0.0039… 0.0059 in)
Crankshaft bearing 2 grooved ball bearings
Conrod bearing Slide bearing
Piston pin bearing No bearing bushes - DLC-plated piston pins
Pistons Forged light alloy
Piston rings 1 compression ring, 1 oil scraper ring
Engine lubrication Pressure circulation lubrication with two rotary pumps
Primary transmission 32:76
Clutch Multidisc clutch in oil bath / hydraulically activated
Transmission ratio
1st gear 14:36
2nd gear 17:32
3rd gear 19:28
4th gear 22:26
5th gear 24:23
6th gear 26:21
Alternator 12 V, 200 W
Ignition Contactless controlled fully electronic ignition with digital igni-
tion adjustment, type Kokusan
Spark plug NGK LKAR 9AI - 10
Spark plug electrode gap 1.0 mm (0.039 in)
Cooling Water, permanent circulation of coolant by water pump
Starter Electric starter
23.2 Engine tightening torques
Screw, membrane M3 1.5 Nm (1.11 lbf ft) Loctite
®
243™
Oil jet, piston cooling M4 2 Nm (1.5 lbf ft) Loctite
®
243™
Screw, cable holder in alternator
cover
M4 4 Nm (3 lbf ft) Loctite
®
243™
Oil jet, piston cooling M5 2 Nm (1.5 lbf ft) Loctite
®
243™
Oil jet, rocker arm lubrication M5 2 Nm (1.5 lbf ft) Loctite
®
243™
Screw, bearing retainer M5 6 Nm (4.4 lbf ft) Loctite
®
2701™
Screw, clutch spring retainer M5 6 Nm (4.4 lbf ft) –
Screw, ignition pulse generator M5 6 Nm (4.4 lbf ft) Loctite
®
243™
Screw, locking lever M5 6 Nm (4.4 lbf ft) Loctite
®
243™
Screw, oil filter cover M5 6 Nm (4.4 lbf ft) –
Screw, oil pump cover M5 6 Nm (4.4 lbf ft) Loctite
®
243™
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