23
TECHNICAL DATA
98
23.1
Engine
Design
1-cylinder 4-stroke engine, water-cooled
Displacement
349.7 cm³ (21.34 cu in)
Stroke
57.5 mm (2.264 in)
Bore
88 mm (3.46 in)
Compression ratio
12.3:1
Idle speed
1,800… 1,900 rpm
Control
DOHC, four valves controlled via cam lever, drive via timing
chain
Valve diameter, intake
36.3 mm (1.429 in)
Valve diameter, exhaust
29.1 mm (1.146 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)
0.13… 0.18 mm (0.0051… 0.0071 in)
Crankshaft bearing
2 cylinder bearings
Conrod bearing
Slide bearing
Piston pin bearing
No bearing bushes - DLC coated piston pins
Pistons
Cast light alloy
Piston rings
1 compression ring, 1 oil scraper ring
Engine lubrication
Pressure circulation lubrication with two Eaton pumps
Primary transmission
24:73
Clutch
Damped multidisc clutch in oil bath/hydraulically activated
Transmission ratio
1st gear
13:32
2nd gear
16:30
3rd gear
16:24
4th gear
23:28
5th gear
23:23
6th gear
26:20
Alternator
12 V, 196 W
Ignition
Contactless controlled fully electronic ignition with digital igni-
tion adjustment
Spark plug
NGK LMAR9AI-10
Spark plug electrode gap
1.0 mm (0.039 in)
Cooling
Water cooling, permanent circulation of coolant by water pump
Starting aid
Electric starter
23.2
Engine tightening torques
Nozzle, crank chamber ventilation
M4
2 Nm (1.5 lbf ft)
Loctite
®
243™
Oil nozzle for alternator cooling
M4
2 Nm (1.5 lbf ft)
Loctite
®
243™
Oil nozzle for balancer shaft lubrication M4
2 Nm (1.5 lbf ft)
Loctite
®
243™
Oil nozzle for conrod bearing lubrica-
tion
M4
2 Nm (1.5 lbf ft)
Loctite
®
243™
Screw, oil nozzle for piston cooling
M4
2 Nm (1.5 lbf ft)
Loctite
®
243™
Locking screw for bearing
M5
6 Nm (4.4 lbf ft)
Loctite
®
243™
Oil channel screw plug in alternator
cover
M5
1.2 Nm (0.89 lbf ft)
Loctite
®
648™
Oil nozzle for cam lever lubrication
M5
3 Nm (2.2 lbf ft)
Loctite
®
243™
Oil nozzle for clutch lubrication
M5
6 Nm (4.4 lbf ft)
Loctite
®
243™
Oil nozzle, piston cooling
M5
2 Nm (1.5 lbf ft)
Loctite
®
243™
Screw, bearing bolt, oil pump idler
gear
M5
6 Nm (4.4 lbf ft)
Loctite
®
243™
Screw, crankshaft position sensor
M5
6 Nm (4.4 lbf ft)
Loctite
®
243™