Kawasaki Z 750F (1977) vs Yamaha YZF 600R Thundercat (1999) vs Yamaha XS 650 / XS 650D (1977)
Comparison technical specifications
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| Make: | Kawasaki | Yamaha | Yamaha |
| Model: | Z 750F | YZF 600R Thundercat | XS 650 / XS 650D |
| Years: | 1977 | 1999 | 1977 |
| Engine: | Four stroke, transverse four cylinder. DOHC, 2 valve per cylinder | Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder | Four stroke, parallel twin cylinder, SOHC, 2 valves per cylinder. |
| Capacity: | 746 cc / 45.5 cu-in | 599 cc / 36.5 cu-in | 653 cc / 39.8 cu in |
| Bore x Stroke: | 64 х 58 mm | 62 x 49.6 mm | 75 x 74 mm |
| Cooling System: | Air cooled | Liquid cooled | Air cooled |
| Compression Ratio: | 12.0:1 | 8.4:1 | |
| Induction: | 4x Mikuni VM 28 SC carburetors | 4 x 36 mm Keihin CV downdraft carburetors | 2 x Mikuni BS38 carburetors |
| Ignition: | Battery & coil | Digital TCI | Battery, induction coil |
| Starting: | Electric & kick | Electric | Electric and kick |
| Max Power: | 70 hp / 52.1 kW @ 9000 rpm | 72.9 kW / 100 hp @ 11500 rpm | 39.5 kW / 53 hp @ 7200 rpm |
| Max Torque: | 5.9 kgf-m / 42.6 lb-ft @ 7500 rpm | 65.7 Nm / 6.7 kgf-m / 48.7 lb-ft @ 9500 rpm | 54 Nm / 5.5 kgf-m / 39.8 lb-ft @ 6800 rpm |
| Transmission: | 5 Speed | 6 Speed | 5 Speed |
| Final Drive: | Chain, 96 Link | 530 O-ring chain OEM sprocket sizes per tooth Front= 15 Back= 47 | Chain |
| Front Suspension: | Telescopic forks | 41 mm telescopic fork adjustable preload, compression and rebound damping | Telescopic forks |
| Rear Suspension: | Swing arm dual shocks | Monoshock adjustable preload, bump and rebound | Dual shock absorbers |
| Front Brakes: | 2x disc | 2x 300 mm Discs, 4 piston calipers | Twin hydraulic discs, 267 mm |
| Rear Brakes: | Drum | Single 245mm disc, 2 piston caliper | Drum |
| Front Tyre: | 3.25-19 | 120/60-17 | 3.50H-19 4PR |
| Rear Tyre: | 4.00-18 | 160/60-17 | 4.00H-18 4PR |
| Dry Weight: | 230 kg / 507 lbs | 189 kg / 417 lbs | 191 kg / 420 lbs |
| Fuel Capacity: | 17.7 Litres / 4.6 US gal | 19 Litres / 5.0 US gal / 4.2 Imp gal | 15 Litres / 4.0 US gal |