22 TECHNICAL DATA
120
22.1
Engine
Design
1-cylinder 4-stroke engine, water-cooled
Displacement
449.9 cm³ (27.455 cu in)
Stroke
63.4 mm (2.496 in)
Bore
95 mm (3.74 in)
Compression ratio
12.75:1
Idle speed
2,250 … 2,350 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 cylinder roller bearing
Conrod bearing
Slide bearing
Piston pin bearing (MC)
No bearing bush
–
DLC coated piston pin
Pistons
Forged light alloy
Piston rings
1 compression ring, 1 oil scraper ring
Engine lubrication
Pressure circulation lubrication with 2 trochoidal pumps
Primary transmission
31:76
Clutch
Multidisc clutch in oil bath, hydraulically activated
Gearbox
Transmission ratio
Alternator
12 V, 70 W
Ignition
Contactless controlled fully electronic ignition with digital
ignition adjustment
Spark plug
NGK LMAR9AI-8
Spark plug electrode gap
0.8 mm (0.031 in)
Cooling
Water cooling, permanent circulation of coolant by water
pump
Starting aid
Starter motor
22.2
Engine tightening torques
Screw, oil jet for piston cooling
M4
2 Nm (1.5 lbf ft)
Loctite
®
243™
Crankshaft speed sensor screw and
cable retainer
M5
6 Nm (4.4 lbf ft)
Loctite
®
243™
Oil nozzle for clutch lubrication
M5
2 Nm (1.5 lbf ft)
Loctite
®
243™
Oil nozzle for timing chain lubrication
M5
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
®
243™
