The Triumph Trophy TR6C (1961) motorcycle had a four-stroke, parallel twin cylinder, overhead valve engine with a displacement of 649cc. It had a compression ratio of 8.5:1 and a bore and stroke of 71 x 82 mm. Valve clearance (cold) was 0.05mm for the inlet and 0.10mm for the exhaust. Its ignition was a Lucas magneto and it had a 1 x 30mm Amal Monobloc carburetor. The clutch was multi-plate and wet and the transmission had four speeds. The final drive was a chain that had 101 links. The front suspension was telescopic forks, while the rear suspension was a swingarm. Both front and rear brakes used drums. Tyres were 3.25-19 on the front and 4.00-18 on the rear. It had a length of 2190 mm, a width of 720 mm, and a wheelbase of 1403 mm. The seat height was 775 mm and its dry weight was 173 kg. The fuel capacity was 18 litres.
Technical specifications:
Make Model: Triumph TR6C / SC / SR / SS Trophy
| Year | 1961 – |
|---|---|
| Engine | Four stroke, parallel twin cylinder, OHV |
| Capacity | 649 cc / 39.6 cu in |
| Bore x Stroke | 71 X 82 mm |
| Compression Ratio | 8.5:1 |
| Valve Clearance (cold) | Inlet: 0.05mm / 0.002″ Exhaust: 0.10mm / 0.004″ |
| Valve Timing | Inlet Valve Opens: 34 degrees BTDC Inlet Valve Closes: 55 degrees BTDC Exhaust Valve Opens: 48 degrees BTDC Exhaust Valve Closes: 27 degrees BTDC |
| Induction | 1 x 30 mm Amal Monobloc carburetor |
| Ignition | Lucas magneto |
| Spark Plug Gap | 0.50mm / 0.020″ |
| Timing (fully advanced) | Crankshaft position 38 degrees BTDC Piston position 11mm / 7/16″ BTDC |
| Clutch | Multi-plate, wet |
| Clutch | Wet, multi-plate |
| Transmission | 4 Speed |
| Final Drive | Chain, 101 links |
| Gear Ratios | 4th 4.88 / 3rd 5.81 / 2nd 8.25 / 1st 11.92:1 |
| Front Suspension | Telescopic Forks |
| Rear Suspension | Swingarm |
| Front Brakes | Drum |
| Rear Brakes | Drum |
| Front Tyre | 3.25 – 19 |
| Rear Tyre | 4.00 – 18 |
| Dimensions | Length 2190 mm / 86.25 in Width 720 mm / 28.5 in |
| Wheelbase | 1403 mm / 55.2 in |
| Seat Height | 775 mm / 30.5 in |
| Dry Weight | 173 kg / 380 lbs |
| Fuel Capacity | 18 Litres / 4.8 US gal / 4.0 Imp gal |
