Technical Data; Engine; Duke - KTM 125 Duke Owner's Manual

21

TECHNICAL DATA

21.1

Engine

21.1.1

125 Duke

Design
Displacement
Stroke
Bore
Compression ratio
Control
Valve diameter, intake
Valve diameter, exhaust
Valve clearance, intake, cold
Valve clearance, exhaust, cold
Crankshaft bearing
Conrod bearing
Pistons
Piston rings
Engine lubrication
Primary transmission
Clutch
Transmission
Transmission ratio
1st gear
2nd gear
3rd gear
1-cylinder 4-stroke engine, water-cooled
125 cm³ (7.63 cu in)
47.2 mm (1.858 in)
58 mm (2.28 in)
12.8:1
DOHC, 4 valves controlled via cam lever, chain drive
22.5 mm (0.886 in)
19 mm (0.75 in)
0.08... 0.12 mm (0.0031... 0.0047 in)
0.13... 0.17 mm (0.0051... 0.0067 in)
Two ball bearings
Sleeve bearing
Cast light alloy
1 L-ring, 1 tapered compression piston ring, 1 oil scraper ring
Pressure circulation lubrication with one rotary pump
22:72
Clutch in oil bath/mechanically activated
6-gear, claw shifted
12:34
15:31
18:28
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