Triumph TR6 Trophy
Triumph TR6 Trophy | |
Manufacturer | [[Triumph]] |
---|---|
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
The engine featured a 8.5:1 compression ratio.
Drive
Power was moderated via the Wet, multi-plate.
Chassis
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
Overview
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
Make Model | Triumph TR6C / SC / SR / SS Trophy |
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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 |