Technical Data - Engine - KTM ENDURO 640 LC4 Owner's Manual

TECHNICAL DATA – ENGINE
ENGINE
Design
Displacement
Bore / Stroke
Ratio
Fuel
Valve timing
Camshaft
Valve diameter
Valve clearence cold
Crank shaft bearing
Connecting rod bearing
Top end bearing
Piston
Piston rings
Engine lubrication
Engine oil
Engine oil quantity
Primary ratio
Clutch
Transmission
Gear ratio
Ignition system
Ignition timing
Generator
Spark plug
Spark plug gap
Cooling system
Cooling liquid
Starting equipment
#
JASO T903 MA
TEMPERATURE
0°C
32°F
5W/40
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).
»
640 LC4
Liquid-cooled single cylinder 4-stroke engine with balancer shaft and electric starter
625 cc
101 / 78 mm
11.7 : 1
unleaded premium gasoline with at least RON 95 (USA = Premium RON 91) (RON 80-94 for other ignition curve
4 valves over rocker arm and 1 overhead camshaft, camshaft drive through single chain
249/1
Intake: 36 mm Exhaust: 32 mm
Intake: 0.12 - 0.15 mm Exhaust: 0.12 - 0.15 mm
2 cylinder roller bearing
needle bearing
bronze bushing
forged aluminium alloy
1 compression ring, 1 taper face ring, 1 oil scraper ring
two Eaton-oilpumps
see bellow #
appr. 2.1 liters including frame
straight geared spur wheels 31 : 79 teeth
multi disc clutch in oil bath, hydraulically operated
5-speed claw shifted
1 st 14:35
2 nd 15:24
3 rd 18:21
4 th 20:19
5 th 22:18
contactless DC-CDI ignition with digital advanced system type KOKUSAN 4K5
TPS
12V 200W
NGK DCPR 8 E
0.9 mm
liquid cooled, permanent rotation of cooling liquid through mechanic driven water pump
1 liter, 50% antifreeze, 50% distilled water, at least –25 ° C (–13 ° F)
electric starter and kickstarter
10W/50
BASIC CARBURETOR SETTING
640 LC4 Enduro
Type BST40-266
Main jet 152,5
Needle jet X-6 689
Idling jet 45
Jet needle 6G5
Needle clip pos. f. top 3rd from top
Mixt. adj. screw open 2.25
51
640 LC4 Supermoto
BST40-273
165
X-6 689
45
6G5
3rd from top
2.25