🔧 Triumph T120 750cc Parallel Twin
The Triumph T120 Bonneville engine is perhaps the most famous motorcycle engine in history. The 649cc (later 744cc) parallel twin with 360° firing order powered Bonneville's land speed record, numerous café racers, Steve McQueen's movie bikes, and Isle of Man TT victories. Its simplicity, tunability, and distinctive sound made it the definitive British motorcycle engine.
Engine
Technical Specifications
| Type | OHV parallel twin 360° firing |
|---|---|
| Displacement | 744 cc (T140 version) |
| Bore_stroke | 76 × 82 mm |
| Compression | 7.5:1 (standard) |
| Horsepower | 52 hp (T140) |
| Torque | 58 Nm |
| Valvetrain | OHV 2 valves/cyl (pushrod) |
| Block | Aluminium |
| Head | Aluminium (pre-unit: iron) |
| Redline | 6,500 rpm |
| Oil Capacity | 3.5 L (wet sump) |
| Weight | 68 kg |
| Msrp | $2,500–$8,000 (rebuilt period-correct unit) |