Triumph 6T Thunderbird (1963-66) vs Kawasaki GPZ 305 (1984-)
Comparison technical specifications
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| Make: | Triumph | Kawasaki |
| Model: | 6T Thunderbird | GPZ 305 |
| Years: | 1963-66 | 1984- |
| Engine: | Four stroke, vertical twin, OHV | Four stroke Parallel twin, SOHC, 2 valves per cylinder |
| Capacity: | 649 cc / 40.0 cu in | 306 cc / 18.7 cu-in |
| Bore x Stroke: | 71 x 82 mm | 61.0 x 52.4 mm |
| Cooling System: | Air cooled | Air cooled |
| Compression Ratio: | 8.5:1 | 9.7:1 |
| Induction: | Amal Monobloc | 2x 32mm Keihin CVi carburetors |
| Starting: | Kick | Electric |
| Max Power: | 31 kW / 42 hp @ 6500 rpm | 19.9 kW / 26.6 hp @ 10000 rpm |
| Clutch: | Wet, multiplate | Wet clutch |
| Transmission: | 4-Speed constant mesh | 6 Speed |
| Final Drive: | Chain | Belt |
| Front Suspension: | Telescopic fork, 2 way hydraulic damping | Telescopic forks |
| Rear Suspension: | Swingarm, 2 hydraulic dampers | Swing arm |
| Front Brakes: | SLS drum, 8 in | 2x disc |
| Rear Brakes: | SLS drum, 7 in | Drum |
| Wheelbase: | 1384 mm / 54.5 in | 1355 mm / 53.3 in |
| Seat Height: | 825.5 mm / 32.5 in | 784 mm / 30.8 in |
| Dry Weight: | 165 kg / 363 lbs | 147 kg / 324 lbs |