TECHNICAL DATA 22
129
22.1
Engine
Design
1-cylinder 4-stroke engine, water-cooled
Displacement
249.92 cm³ (15.2511 cu in)
Stroke
48.5 mm (1.909 in)
Bore
81 mm (3.19 in)
Compression ratio
14.5:1
Idle speed
2,250 … 2,350 rpm
Control
DOHC, four valves controlled via cam lever, drive via
timing chain
Valve diameter, intake
32.5 mm (1.28 in)
Valve diameter, exhaust
27.5 mm (1.083 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
Slide 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
24:72
Clutch
Multidisc clutch in oil bath/hydraulically activated
Gearbox
5-gear transmission, claw shifted
Transmission ratio
first-gear
13:32
second-gear
16:32
third-gear
17:28
fourth-gear
19:26
fifth-gear
21:25
Alternator
12 V, 70 W
Ignition
Contactless controlled fully electronic ignition with
digital ignition 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
Starter motor