KTM 690 SMC USA 2010, Owner'S Manual, Page: 169 / 196

TECHNICAL DATA - ENGINE
167
Design 1-cylinder 4-stroke engine, water-cooled
Displacement 654 cm³ (39.91 cu in)
Stroke 80 mm (3.15 in)
Bore 102 mm (4.02 in)
Compression ratio 11.8:1
Control OHC, 4 valves controlled via rocker arm, chain drive
Valve diameter, intake 40 mm (1.57 in)
Valve diameter, exhaust 34 mm (1.34 in)
Valve play, cold 0.07… 0.13 mm (0.0028… 0.0051 in)
Crankshaft bearing 2 roller bearings
Conrod bearing Needle bearing
Piston pin bearing Bronze bush
Pistons Forged light alloy
Piston rings 1 L-ring, 1 tapered compression piston ring, 1 oil scraper ring
Engine lubrication Semi-dry sump lubrication with two rotor pumps
Primary transmission 36:79
Clutch APTC™ Antihopping clutch in oil bath / hydraulically operated
Gearbox 6-gears, claw-shifted
Transmission ratio
1st gear 14:35
2nd gear 16:28
3rd gear 21:28
4th gear 21:23
5th gear 23:22
6th gear 23:20