KTM 640 DUKE Specs (1999) | technical specification

KTM 640 DUKE Specs (1999)

KTM 640 Duke II 99 3 KTM 640 Duke has liquid-cooled single cylinder and 4-stroke engine with total displacement 625 ccm. The following technical specification applies for KTM 640 DUKE 1999 models. Herein you will find complete and detail information about the engine, chassis and basic carburetor setting specification. (source: KTM service manual)

ENGINE

Type 640 LC4-E
Design Liquid-cooled single cylinder 4-stroke engine with balancer shaft and electric starter
Displacement 625 ccm
Bore / Stroke 101 / 78 mm
Ratio 11,0 : 1
Fuel unleaded premium gasoline with a least RON 95
Valve timing 4 valves over rocker arm and 1 overhead camshaft, camshaft drive through single chain
Camshaft 249° (249/1)
Valve timing by 1 mm IO 13° BTDC, EO 53° BBDC
Valve clearance IC 53° ABDC, EC 11° ATDC
Valve diameter Intake: 36 mm, Exhaust: 30 mm
Valve clearance cold Intake: 0.15 mm, Exhaust: 0.15 mm
Crank shaft bearing 2 cylinder roller bearing
Connecting rod bearing needle bearing
Top end bearing bronze bushing
Piston cast aluminum alloy
Piston rings 1 compression ring, 1 taper face ring, 1 oil scraper ring
Engine lubrication 2 Eaton-Oilpumps
Engine oil quantity 2.1 liters including frame
Primary ratio straight geared spur wheels 30 : 81 teeth
Clutch multi disc clutch in oil bath
Transmission 5-speed claw shifted
gear ratio:

1st
2nd
3rd
4th
5th

14:35
15:24
18:21
20:19
22:18
Ignition system contactless DC- CDI ignition with digital advanced system type KOKUSAN
Ignition timing adjustment to max. 38° BTDC at 6000 rpm
Generator 12V 200W
Spark plug NGK DPR8 EA-9
Spark plug gap 0.90 mm
Cooling system liquid cooled, permanent rotation of cooling liquid through mechanic driven water pump
Cooling liquid 1 liter, 40% antifreeze, 60% water, at least –25° C (–13° F)
Starting equipment electric starter, kick starter

CHASSIS

Frame Central chrome-moly-steel frame
Fork type WP – USD 43 Top adjuster 518T780
wheel travel 140 mm (5,5 in)
standard adjustment compression driver only = 14, with passenger = 14
standard adjustment rebound driver only = 14, with passenger = 14
fork leg projection upper fork bridge 3 mm (0.12 in)
oil capacity per fork leg appr. 750 ccm (45 cubic in) / SAE 5
air chamber length 100 mm (4 in)
Rear suspension WP central shock absorber with PRO-LEVER linkage to rear- swing-arm with needle bearing
Shock absorber type WP central shock absorber BAVP 118Q785
rear wheel travel 170 mm (6.7 in)
standard adjustment compression driver only = 3, with passenger = 5
standard adjustment rebound driver only = 5, with passenger = 3
spring preloads driver only = 23 mm (0.9 in),with passenger = 28 mm (1.1 in)
spring type 70 – 260
Front brake Disc brake with carbon-steel brake disc Ø 320 mm (12,6 in) and 4-piston brake caliper
Rear brake Disc brake with carbon-steel brake disc Ø 220 mm (8,7 in) and single-piston brake caliper floated
Front tyre size 120/70 R 17 58H
Rear tyre size 160/60 R 17 69H
Fuel tank capacity 12 liter (3,2 US gallons), out of this 2,5 liter (0,6 US gallons) reserve
Final drive ratio 17 : 38
Chain o-ring 5/8 x 1/4″
Dead weight without fuel 145 kg (3 lbs)
Max. permissible front axle load 150 kg (2 lbs)
Max. permissible rear axle load 200 kg (4 lbs)
Max. permissible laden weight 350 kg (773 lbs)
Steering angle 64,2°
Wheel base 1460 ± 15 mm (57.5 ± 0.6 in)
Seat high 860 mm (33.9 in)
Ground clearance 250 mm (9.9 in)

ELECTRICAL

Battery maintenance-free battery 12V 8Ah
Low beam lamps HB3 12V 65W (socket P20d)
high beam lamps HB3 12V 65W (socket P20d)
parking light 12V 5W (socket W2,1×9,5d)
speedometer, tachometer light 12V 1,2W (socket W2x4,6d)
indicator lamp 12V 1,2W (socket W2x4,6d)
stop and taillight 12V 21/5W (socket BaY15d)
flasher 12V 10W (socket Ba15s)

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