Technical Data; Engine - KTM 2015 RC 390 EU Owner's Manual

23

TECHNICAL DATA

23.1

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
1st gear
2nd gear
3rd gear
1-cylinder 4-stroke engine, water-cooled
373 cm³ (22.76 cu in)
60 mm (2.36 in)
89 mm (3.5 in)
12.6:1
DOHC, 4 valves controlled via cam lever, chain drive
36 mm (1.42 in)
29 mm (1.14 in)
0.08... 0.12 mm (0.0031... 0.0047 in)
0.13... 0.17 mm (0.0051... 0.0067 in)
2 slide bearings
Sleeve bearing
Forged light alloy
1 compression ring, 1 tapered compression piston ring, 1 oil
scraper ring
Pressure circulation lubrication with two rotary pumps
30:80
Clutch in oil bath/mechanically activated
6-gear, claw shifted
12:32
14:26
19:27
171