TECHNICAL DATA 22
121
22.1
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
14.2:1
Idle speed
2,250 … 2,350 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)
0.08 … 0.15 mm (0.0031 … 0.0059 in)
Exhaust at: 20 °C (68 °F)
0.12 … 0.19 mm (0.0047 … 0.0075 in)
Crankshaft bearing
2 cylinder bearings
Conrod bearing
Plain bearing
Piston pin bearing
Bearing bush
Pistons
Forged light alloy
Piston rings
1 compression ring, 1 oil scraper ring
Engine lubrication
Pressure circulation lubrication with 2 trochoidal pumps
Primary transmission
24:73
Clutch
Multidisc clutch in oil bath/hydraulically activated
Gearbox (MC)
5-gear transmission, claw shifted
Gearbox (EX)
6-gear transmission, claw shifted
Transmission ratio (MC)
first-gear
14:28
second-gear
16:26
third-gear
18:24
fourth-gear
21:24
fifth-gear
22:21
Transmission ratio (EX)
first-gear
15:31
second-gear
16:25
third-gear
20:25
fourth-gear
22:23
fifth-gear
25:22
sixth-gear
26:20
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