23
TECHNICAL DATA
102
23.1
Motor
Design
1-cylinder 4-stroke engine, water-cooled
Displacement
449.3 cm³ (27.418 cu in)
Stroke
63.4 mm (2.496 in)
Bore
95 mm (3.74 in)
Compression ratio
12.6:1
Idle speed
2,000… 2,200 rpm
Control
OHC, 4 valves controlled via rocker arm
Valve diameter, intake
40 mm (1.57 in)
Valve diameter, exhaust
33 mm (1.3 in)
Valve clearance
Intake at: 20 °C (68 °F)
0.10… 0.15 mm (0.0039… 0.0059 in)
Exhaust at: 20 °C (68 °F)
0.12… 0.17 mm (0.0047… 0.0067 in)
Crankshaft bearing
2 grooved ball bearings
Conrod bearing
Slide bearing
Piston pin bearing
Not a bearing bush - DLC-plated piston pins
Pistons
Forged light alloy
Piston rings
1 compression ring, 1 oil scraper ring
Engine lubrication
Pressure circulation lubrication with two Eaton pumps
Primary transmission
32:76
Clutch
Multidisc clutch in oil bath/hydraulically activated/damped
Gearbox
6-gear, claw shifted
Transmission ratio
1st gear
16:32
2nd gear
18:30
3rd gear
20:28
4th gear
22:26
5th gear
24:24
Sixth gear
21:18
Alternator
12 V, 200 W
Ignition
Contactless controlled fully electronic ignition with digital igni-
tion adjustment
Spark plug
NGK LKAR8AI-9
Spark plug electrode gap
0.9 mm (0.035 in)
Cooling
Water cooling, permanent circulation of coolant by water pump
Starting aid
Electric starter
23.2
Motor tightening torques
Banjo bolt, oil line
10x1
12 Nm (8.9 lbf ft)
–
Screw, membrane
M3
1.5 Nm (1.11 lbf ft)
Loctite
®
243™
Screw, cable holder in alternator cover
M4
4 Nm (3 lbf ft)
Loctite
®
243™
Screw, oil jet for piston cooling
M4
2 Nm (1.5 lbf ft)
Loctite
®
243™
Oil nozzle, piston cooling
M5
2 Nm (1.5 lbf ft)
Loctite
®
243™
Oil nozzle, 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, crankshaft position sensor
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, stator
M5
10 Nm (7.4 lbf ft)
Loctite
®
648™
Screw, suction pump cover
M5
6 Nm (4.4 lbf ft)
Loctite
®
243™
Nut, water-pump wheel
M6
8 Nm (5.9 lbf ft)
Loctite
®
243™