Technical specifications
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| Model: |
640 Duke II |
| Years: |
1998-00 |
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Engine:
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Four stroke, single Cylinder. SOHC, 4 valves, engine balancer
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Capacity:
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624.6 cc / 38.1 cu in
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Bore x Stroke:
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101 x 78 mm
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Compression Ratio:
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11.5:1
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Cooling System:
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Liquid cooled
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Lubrication:
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2 x Eaten oil pumps
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Induction:
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Mikuni BST 40 carburetor
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Ignition:
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Kokusan contactless DC-CDI ignition with advanced system
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Starting:
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Electric & kick
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Spark Plug:
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NGK DRBEA
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Battery:
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12V 8Ah, maintenance free
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Max Power:
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40.1 kW / 55 hp @ 7000 rpm
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Max Torque:
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60 Nm / 6.1 kgf-m / 44.3 lb-ft @ 5500 rpm
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Clutch:
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Multi-disc in oil bath
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Transmission:
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5 Speed
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Primary Drive Ratio:
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30:81, straight cut gears
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Gear Ratios:
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1st 14:35 / 2nd 15:24 / 3rd 18:21 / 4th 20:19 / 5th 22:18
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Final Drive Ratio:
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17:38
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Final Drive:
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Chain, O-ring 5/8 x 1/4"
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Frame:
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Central chrome-moly steel frame
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Front Suspension:
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WP - 4054 Roma Top adjuster, preload, compression and rebound adjustable
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Front Wheel Travel:
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140 mm / 5.5 in
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Rear Suspension:
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Central shock absorber WP IBS with PRO-LEVER linkage to rear- swing-arm with needle bearing
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Rear Wheel Travel:
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170 mm / 6.7 in
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Front Brakes:
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Single 320 mm disc, 4 piston caliper
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Rear Brakes:
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Single 220 mm disc, 1 piston caliper
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Front Tyre:
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120/70 - ZR17 58H
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Rear Tyre:
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160/60 - ZR17 69H
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Steering Head Angle:
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62.5o
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Wheelbase:
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1460 mm / 57.5 in
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Ground Clearance:
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250 mm / 9.9 in
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Seat Height:
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860 mm / 33.9 in
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Dry Weight:
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145 kg / 320lbs
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GVWR:
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350 kg / 773 lbs
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Engine Oil Capacity:
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2.2 L / 2.3 US qt / 1.9 Imp qt
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Fuel Capacity:
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11.3 L / 3.0 US gal / 2.4 Imp gal
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Standing ¼ Mile:
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12.5 sec
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Top Speed:
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162 km/h / 101 mph
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