TECHNICAL DATA - ENGINE
156
Design
1-cylinder 4-stroke engine, water-cooled
Displacement (Duke)
654 cm³ (39.91 cu in)
Displacement (Duke R)
690 cm³ (42.11 cu in)
Stroke (Duke)
80 mm (3.15 in)
Stroke (Duke R)
84.5 mm (3.327 in)
Bore
102 mm (4.02 in)
Compression ratio (Duke)
11.8:1
Compression ratio (Duke R)
12.5:1
Control
OHC, 4 valves controlled via rocker arm, chain drive
Valve diameter, intake
40 mm (1.57 in)
Valve diameter, exhaust
34 mm (1.34 in)
Valve play, cold
0.07… 0.13 mm (0.0028… 0.0051 in)
Crankshaft bearing
2 roller bearings
Conrod bearing
Needle bearing
Piston pin bearing (Duke)
Bronze bush
Piston pin bearing (Duke R)
Piston pin with
DLC
coating
Pistons
Forged light alloy
Piston rings
1 L-ring, 1 tapered compression piston ring, 1 oil scraper ring
Engine lubrication
Semi-dry sump lubrication with two rotor pumps
Primary transmission
36:79
Clutch
APTC™
Antihopping clutch in oil bath / hydraulically operated
Gearbox
6-gears, claw-shifted
Transmission ratio
1st gear
14:35
2nd gear
16:28
Summary of Contents for 690 DUKE R AUS/UK
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Page 113: ...ELECTRICAL SYSTEM 111 700169 10 Remove screws 700170 10 Fold the headlight mask forward...