KTM 620 Duke (1997) vs KTM 640 LC4 Adventure Travel (2008)
Comparison technical specifications
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| Make: | KTM | KTM |
| Model: | 620 Duke | 640 LC4 Adventure Travel |
| Years: | 1997 | 2008 |
| Engine: | Four stroke, single cylinder, SOHC, 4 valves | Four stroke, single Cylinder. SOHC, 4 Valve per cylinder |
| Capacity: | 609 cc / 37.2 cu in | 624.6 cc / 38.1 cu in |
| Bore x Stroke: | 101 x 76 mm | 101 x 78 mm |
| Compression Ratio: | 10.4:1 | 11.0:1 |
| Cooling System: | Liquid cooled | Liquid cooled |
| Induction: | Dell'Orto PHM 40 SD carburetor | Mikuni BST 40 |
| Ignition: | KDC-CDI | Contactless DC-CDI ignition with digital advanced system, KOKUSAN |
| Starting: | Kick | Kick & electric |
| Max Power: | 40.1 kW / 55 hp @ 7000 rpm | 35.7 kW / 49 hp @ 7500 rpm |
| Max Torque: | 60 Nm / 6.1 kgf-m / 44.3 lb-ft @ 5500 rpm | 52 Nm / 5.3 kgf-m / 38.4 lb-ft @ 5500 rpm |
| Transmission: | 5 Speed | 5 Speed, claw shifted |
| Final Drive: | Chain | Chain |
| Front Suspension: | White Power 4054 Top Adjuster | 50 mm WP upside-down forks |
| Front Wheel Travel: | 142 mm / 5.6 in | 300 mm / 11.8 in |
| Rear Suspension: | White Power monoshock 4681 BAVP Single Adjuster | WP monoshock |
| Rear Wheel Travel: | 170 mm / 6.7 in | 320 mm / 12.6 in |
| Front Brakes: | Single 320 mm disc, 4 piston caliper | 2X 300mm sisc |
| Rear Brakes: | Single 220 mm disc, 1 piston caliper | Single 220mm disc, 1 piston floating caliper |
| Front Tyre: | 120/70 - 17 Pirelli MT60 | 90/90 - 21 54S Enduro 3 |
| Rear Tyre: | 160/60-17 Pirelli MT60 | 140/80 - 18 70R Enduro 3 |
| Seat Height: | 894 mm / 35.2 in | 945 mm / 37.2 in |
| Dry Weight: | 145 kg / 320 lbs | 158.0 kg / 348.3 lbs |
| Fuel Capacity: | 10.3 Litres / 2.7 US gal / 2.3 Imp gal | 28 Litres / 7.4 US gal / 6.2 Imp gal |
| Fuel Reserve: | 1.8 L / 1.9 US qt / 1.6 Imp qt | 3.8 Litres / 1.0 US gal / 0.8 Imp gal |