KTM 640 Duke II (1998-00) vs BMW F 750GS (2019) vs Kawasaki ZX-4 F3 (1988) vs Suzuki GS 750E II (1980)
Comparison technical specifications
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| Make: | KTM | BMW | Kawasaki | Suzuki |
| Model: | 640 Duke II | F 750GS | ZX-4 F3 | GS 750E II |
| Years: | 1998-00 | 2019 | 1988 | 1980 |
| Engine: | Four stroke, single Cylinder. SOHC, 4 valves, engine balancer | Four stroke, parallel twin cylinder, DOHC, 4 valves per cylinder | Four stroke, transverse four cylinder, DOHC, 4 Valve per cylinder. | Four stroke, transverse four cylinders, DOHC, 2 valve per cylinder. |
| Capacity: | 624.6 cc / 38.1 cu in | 853 cc / 52 ci-in | 399 cc / 24.3 cu-in | 748 cc / 45.6 cu in |
| Bore x Stroke: | 101 x 78 mm | 84 x 77mm | 57 х 39 mm | 65 x 56.4 mm |
| Compression Ratio: | 11.5:1 | 12.7:1 | 11.5:1 | 8.7:1 |
| Induction: | Mikuni BST 40 carburetor | Electronic intake injection | 4x Keihin CVKD30 carburetors | 4 x Mikuni VM26SS carburators |
| Ignition: | Kokusan contactless DC-CDI ignition with advanced system | Knock control and oxygen sensors. | CDI | Battery, coil |
| Starting: | Electric & kick | Electric | Electric | Electric & kick |
| Max Power: | 40.1 kW / 55 hp @ 7000 rpm | 77 hp / 57.4 kW @ 7500rpm | 59 hp / 44 kW @ 12000 rpm | 53.6 kW / 72 hp @ 8500 rpm |
| Max Torque: | 60 Nm / 6.1 kgf-m / 44.3 lb-ft @ 5500 rpm | 83 Nm / 61.2 lb-ft @ 6000rpm | 3.6 kgf-m / 26.0 lb-ft @ 10500 rpm | 60 Nm / 6.1 kgf-m / 44.2 lb-ft @ 8250 rpm |
| Clutch: | Multi-disc in oil bath | Multiplate wet clutch (anti-hopping), mechanically controlled | Wet multi disc | Wet multi-plate |
| Transmission: | 5 Speed | Constant-Mesh 6 speed | 6 Speed | 5 Speed |
| Final Drive: | Chain, O-ring 5/8 x 1/4" | O-ring chain | Chain | Chain, 630SO 96 link, O-ring .81/2 in. free-play |
| Front Suspension: | WP - 4054 Roma Top adjuster, preload, compression and rebound adjustable | 41mm telescopic forks | 41mm Telescopic forks | 35mm Kayaba with anti dive adjustable air pressure. |
| Rear Suspension: | Central shock absorber WP IBS with PRO-LEVER linkage to rear- swing-arm with needle bearing | Aluminum double-sided swing arm, directly mounted, preload and rebound damping adjustable (Dynamic ESA) | Rising rate monoshock | Dual shocks adjustable preload and spring rebound damping. |
| Front Brakes: | Single 320 mm disc, 4 piston caliper | 2 x 305mm discs, 2 piston calipers, ABS | 2x 300mm discs 4 piston calipers | Single 292 mm disc, 1 piston caliper |
| Rear Brakes: | Single 220 mm disc, 1 piston caliper | Single 265mm disc,1 piston caliper, ABS | Single 240mm disc 1 piston caliper | Single 292 mm disc ,1 piston caliper |
| Front Tyre: | 120/70 - ZR17 58H | 110/80-19 | 110/70-17 | 3.25 H19 |
| Rear Tyre: | 160/60 - ZR17 69H | 150/70-17 | 140/60-18 | 4.00 H18 |
| Wheelbase: | 1460 mm / 57.5 in | 1559 mm / 61.4 in | 1395 mm / 54.9 in | 1490 mm / 58.7 in |
| Fuel Capacity: | 11.3 L / 3.0 US gal / 2.4 Imp gal | 15 Litres / 4.0 US gal | 16 Litres / 4.2 US gal | 18 Litres / 4.8 US gal / 4.0 Imp gal |