KTM Supermoto 690 - Manual (Page 139)

TECHNICAL DATA - ENGINE
137
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Design 1-cyliner 4-stroke engine, water-cooled
Displacement 654 bcm³ (39.91bcubin)
Stroke 80 bmm (3.15bin)
Bore 102 bmm (4.02bin)
Compression ratio 11,8:1
Control OHC, 4 valves controlled via rocker arm, chain drive
Valve diameter, intake 40 bmm (1.57bin)
Valve diameter, exhaust 34 bmm (1.34bin)
Valve play, cold 0.07… 0.13 bmm (0.0028… 0.0051bin)
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 Pressure circulation lubrication with 2 rotor pumps
Primary transmission 36:79
Clutch APTC antihopping clutch in oil-bath / hydraulically actuated
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