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20 TECHNICAL DATA 76

20.1 Engine

Design 1-cylinder 2-stroke engine, water-cooled, with reed intake

Displacement 49.0 cm³ (2.99 cu in)

Stroke 40 mm (1.57 in)

Bore 39.5 mm (1.555 in)

Crankshaft bearing 2 grooved ball bearings

Conrod bearing Needle bearing

Piston pin bearing Needle bearing

Pistons Aluminum cast

Piston rings 1 rectangular ring

Engine lubrication (50 SX) Mixture oil lubrication

Engine lubrication (50 SX Mini) Separate lubrication

Primary transmission 33:61 straight cut spur gear

Clutch Multi-disc automatic clutch on the main shaft/centrifugal force

Gearbox Rigid 1-stage reduction gear

Transmission ratio 14:31

Ignition SELETTRA 2p D36

Spark plug NGK LR 8 B

Spark plug electrode gap 0.60 mm (0.0236 in)

Cooling Water-cooled

Starting aid Kickstarter

20.2 Engine tightening torques

Screw, bearing retainer M5 5 Nm (3.7 lbf ft) –

Screw, kickstarter M5 6 Nm (4.4 lbf ft)

Loctite

243™

Screw, oil pump (50 SX Mini) M5 6 Nm (4.4 lbf ft) –

Screw, stator clamp M5 6 Nm (4.4 lbf ft)

Loctite

222

Screw, water pump wheel M5 5 Nm (3.7 lbf ft)

Loctite

243™

Bleeder flange of engine case M6 4 Nm (3 lbf ft)

Loctite

243™

Drain plug, water pump cover M6 6 Nm (4.4 lbf ft) –

Screw, alternator cover M6 6 Nm (4.4 lbf ft) –

Screw, clutch cover M6 10 Nm (7.4 lbf ft) –

Screw, engine case M6 10 Nm (7.4 lbf ft) –

Screw, engine sprocket cover M6 10 Nm (7.4 lbf ft) –

Screw, exhaust flange M6 10 Nm (7.4 lbf ft)

Loctite

243™

Screw, fitting pin M6 10 Nm (7.4 lbf ft)

Loctite

648™

Screw, gear oil level check M6 6 Nm (4.4 lbf ft) –

Screw, ignition coil M6 4 Nm (3 lbf ft)

Loctite

243™

Screw, intake flange M6 5 Nm (3.7 lbf ft)

Loctite

243™

Screw, pressure plate M6 10 Nm (7.4 lbf ft)

Loctite

243™

Screw, water pump cover M6 10 Nm (7.4 lbf ft) –

Screw, cylinder head M7 18 Nm (13.3 lbf ft) –

Nuts, cylinder base M8 20 Nm (14.8 lbf ft) –

Screw, outer clutch hub M8 35 Nm (25.8 lbf ft)

Loctite

243™

Stud bolt, cylinder base M8 10 Nm (7.4 lbf ft) –

Spark plug M10x1 10… 12 Nm (7.4…

8.9 lbf ft)

–

Nut, primary gear M10x1.25 40 Nm (29.5 lbf ft)

Loctite

243™

Nut, rotor M10x1.25 15 Nm (11.1 lbf ft)

Loctite

243™

Oil drain plug with magnet M12x1.5 20 Nm (14.8 lbf ft) –

Brand	KTM
Model	50 SX 2012
Category	Motorcycle
Language	English

KTM 50 SX 2012 User Manual

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