KTM RC 250 R - Electrical System Specifications

22 TECHNICAL DATA 78
22.1 Engine
Design 1-cylinder 4-stroke engine with balancer shaft, water-cooled
Displacement 249.5 cm³ (15.225 cu in)
Stroke 48.5 mm (1.909 in)
Hole 81 mm (3.19 in)
Compression ratio 14.5:1
Control DOHC, 4 valves per cylinder, chain-driven
Valve - valve stem diameter
Intake 34.5 mm (1.358 in)
Exhaust 27 mm (1.06 in)
Valve clearance
Exhaust at: 20 °C (68 °F) 0.20… 0.23 mm (0.0079… 0.0091 in)
Intake at: 20 °C (68 °F) 0.10… 0.13 mm (0.0039… 0.0051 in)
Crankshaft bearing Slide bearing
conrod bearing Slide bearing
Piston pin bearing No bearing bushes - DLC-coated piston pins
Piston Forged light alloy
Piston ring 1 compression ring, 1 oil scraper ring
Engine lubrication Semi-dry sump lubrication system with 1 force pump and 2 suc-
tion pumps
Primary transmission 22:64 (22:63/22:65)
Clutch Multi-disc clutch in oil bath/mechanically operated
Transmission 6-gear cassette gearbox, claw-shifted, multiple optional gear
ratios are available
Transmission ratio
1st gear 14:30 (16:36/15:31)
2nd gear 20:36 (16:30/19:33)
3rd gear 18:28 (18:29/18:27)
4th gear 21:29 (21:30/18:24)
5th gear 21:26 (22:28/19:24/19:23/20:24)
6th gear 22:25 (23:27/19:22/26:29/20:22)
Mixture preparation Electronically controlled fuel injection
Ignition system Contactless controlled fully electronic ignition with digital igni-
tion adjustment
Alternator 12 V, 70 W
Spark plug NGK LMAR9AI-8
Electrode gap, spark plug 0.7… 0.8 mm (0.028… 0.031 in)
Cooling Water cooling, permanent circulation of coolant by water pump
Idle speed 2,900… 3,100 rpm
22.2 Engine tightening torques
Oil nozzle 125 M4 2 Nm (1.5 lbf ft) Loctite
®
243™
Oil nozzle 50 M4 2 Nm (1.5 lbf ft) Loctite
®
243™
Oil nozzle 60 M4 2 Nm (1.5 lbf ft) Loctite
®
243™
Nut, cylinder head M5 6 Nm (4.4 lbf ft) –
Oil nozzle, timing chain tensioner M5 6 Nm (4.4 lbf ft) Loctite
®
243™
Remaining engine screws M5 6 Nm (4.4 lbf ft) –
Screw cap, clutch pressure cap M5 5 Nm (3.7 lbf ft) –
Screw plug, alternator cover M5 6 Nm (4.4 lbf ft) Loctite
®
243™
Screw, bearing pin of oil pump idler
gear
M5 6 Nm (4.4 lbf ft) Loctite
®
243™
Screw, bearing retainer of main shaft M5 6 Nm (4.4 lbf ft) Loctite
®
243™