Triumph Trophy TR6C (1961)

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.

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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