
ENGLISH
46
TECHNICAL SPECIFICATIONS – ENGINE
»
ENGINE
660 SMC
Design
Liquid-cooled single cylinder 4-stroke engine with balancer shaft
Displacement
654 ccm
Bore / Stroke
102 / 80 mm
Ratio
11,7 : 1
Fuel
unleaded premium gasoline with a least RON 95 (USA = Premium RON 91)
Valve timing
4 valves over rocker arm and 1 overhead camshaft, camshaft drive through single chain
Camshaft
586V39
Valve diameter
Intake: 36 mm Exhaust: 32 mm
Valve clearence cold
0,12 - 0,15 mm
Crank shaft bearing
2 cylinder roller bearing
Connecting rod bearing
needle bearing
Top end bearing
bronze bushing
Piston
forged aluminium alloy
Piston rings
1 compression ring, 1 taper face ring, 1 oil scraper ring
Engine lubrication
two Eaton-oilpumps
Engine oil
see table #
Engine oil quantity
appr. 2.1 liters including frame (0.55 US gallons)
Primary ratio
straight geared spur wheels 31 : 79 teeth
Clutch
multi disc clutch in oil bath
Transmission
5-speed claw shifted
Gear ratio
1st gear 14:35
2nd gear 15:24
3rd gear 18:21
4th gear 20:19
5th gear 22:18
Ignition system
contactless DC-CDI ignition with digital advanced system type KOKUSAN
Ignition timing
adjustment to max. 34 ° BTDC at 6000 rpm
Generator
12V 110/40W
Spark plug
NGK DCPR 8 E
Spark plug gap
0,9 mm
Cooling system
liquid cooled, permanent rotation of cooling liquid through mechanic driven water pump
Cooling liquid
1 liter, 50% antifreeze, 50% distilled water, at least –25°C (–13°F)
Starting equipment
kickstarter
10W/50
5W/40
JASO T903 MA
TEMPERATUR
0°C
32°F
#
Engine oil
Only use fully synthetic engine oils that meet the JASO
MA quality requirements (see information on the can).
KTM recommends Motorex Power Synt 4T in the 10W/50
viscosity (for temperatures over 0°C, 32°F) or 5W/40
(for temperatures under 0°C, 32°F).
BASIC CARBURATOR SETTING
660 SMC
Type
Keihin FCR-MX 41
Carburator-setting number
4138A
Main jet
165
Jet needle
OBDVT (OBEKR)
Idling jet
42 (45)
Main air jet
200
Idling air jet
100
Needle position
5th from top (4th from top)
Starting jet
85
Mixture control screw open
2
Slide
15
Performance restrictor
Slide stop (–)
Stop pump membrane
858 / 2,15 mm
Hot start device
3,8 mm