Technical Data 22; Engine - KTM RC 125 2019 Owner's Manual

22.1

Engine

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
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 compression 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 transmission, claw shifted

TECHNICAL DATA 22

221