23 TECHNICAL DATA
102
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
1,950… 2,050 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 ignition
adjustment, type Kokusan
Spark plug
NGK LKAR 8AI - 9
Spark plug electrode gap
0.9 mm (0.035 in)
Cooling
Water, permanent circulation of coolant by water pump
Starter
Electric starter
23.2
Engine tightening torques
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™
Screw, stator
M5
6 Nm (4.4 lbf ft)
Loctite
®
243™