Triumph TR6 Trophy

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Triumph-TR6SC-1965.jpg
Triumph TR6 Trophy
Manufacturer
Production 1961 -
Engine
Four stroke, parallel twin cylinder, OHV
Compression ratio 8.5:1
Ignition Lucas magneto
Transmission 4 Speed
Suspension Front: Telescopic Forks
Rear: Swingarm
Brakes Front: Drum
Rear: Drum
Front Tire 3.25 - 19
Rear Tire 4.00 - 18
Wheelbase 1403 mm / 55.2 in
Seat Height 775 mm / 30.5 in
Weight 173 kg / 380 lbs (dry),
Fuel Capacity 18 Liters / 4.8 US gal / 4.0 Imp gal
Manuals Service Manual



Engine[edit | edit source]

The engine featured a 8.5:1 compression ratio.

Drive[edit | edit source]

Power was moderated via the Wet, multi-plate.

Chassis[edit | edit source]

It came with a 3.25 - 19 front tire and a 4.00 - 18 rear tire. Stopping was achieved via Drum in the front and a Drum in the rear. The front suspension was a Telescopic Forks while the rear was equipped with a Swingarm. The TR 6C / SC / SR / SS Trophy was fitted with a 18 Liters / 4.8 US gal / 4.0 Imp gal fuel tank. The bike weighed just 173 kg / 380 lbs. The wheelbase was 1403 mm / 55.2 in long.

Photos[edit | edit source]

Triumph TR 6C / SC / SR / SS Trophy Triumph TR 6C / SC / SR / SS Trophy Triumph TR 6C / SC / SR / SS Trophy Triumph TR 6C / SC / SR / SS Trophy

Overview[edit | edit source]

1961 TRIUMPH TR6 BY THE NUMBERS Gone was the previous "A" & "B" designations introduced in 1960. The new nomenclature was TR6R for 'Roadster' with low pipes & TR6C for 'Competition', the enduro version with high pipes. All went by the model name "Triumph Trophy". 1961 Triumph TR6 engine & frame numbers run from D8432 to D15756, built from Sept. 20, 1960 to Aug. 23, 1961. For 1961 the Triumph TR6 was not listed for sale in the UK.

ENGINE MODS In the interest of quieter operation, starting with Engine #D8858 a new alloy 'Delta' cylinder head was fitted with cast-in pillars between some of the cooling fins, to combat high frequency vibration causing a 'ringing' sound. Starting with Engine #D14438 the one-piece forged steel crankshaft now featured straight-sided webs & the central flywheel was increased in width from 2-1/4" to 2-11/32".


The balance factor now changed from 50% to 71%. Finally, the engine sprocket reduced to 21 teeth, lowering the overall gearing of the bike. In the gearbox, the sintered bronze layshaft bushings (bushes) were replaced with Torrington M11121 needle roller bearings. DUPLEX FRAME PROBLEMS ADDRESSED Within months of its launch in 1960, the new Duplex Frames were cracking around the steering head. The factory quickly addressed it and 1960-model bikes were retrofitted by dealers with an additional bracing tube under the backbone, all under warranty. Now, the 1961 Triumph TR6 and all other Triumph motorcycles sharing the duplex frame, got the additional bracing tube installed at the factory. Interestingly, most of the frame cracking problems were in the US & were later attributed to the brutal punishment the bikes were forced to endure in off-road racing. Source

Specifications[edit | edit source]

Make Model Triumph TR6C / SC / SR / SS Trophy
Year 1961 -
Engine Type Four stroke, parallel twin cylinder, OHV
Displacement 649 cc / 39.6 cu in
Bore X Stroke 71 X 82 mm
Compression 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 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 Tire 3.25 - 19
Rear Tire 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 Liters / 4.8 US gal / 4.0 Imp gal

In Movies[edit | edit source]

Videos[edit | edit source]

External Links[edit | edit source]