Technical specifications
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| Model: |
6T Thunderbird |
| Years: |
1963-66 |
|
Engine:
|
Four stroke, vertical twin, OHV
|
|
Capacity:
|
649 cc / 40.0 cu in
|
|
Bore x Stroke:
|
71 x 82 mm
|
|
Cooling System:
|
Air cooled
|
|
Compression Ratio:
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8.5:1
|
|
Exhaust:
|
Two-into-two
|
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Induction:
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Amal Monobloc
|
|
Starting:
|
Kick
|
|
Max Power:
|
31 kW / 42 hp @ 6500 rpm
|
|
Clutch:
|
Wet, multiplate
|
|
Transmission:
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4-Speed constant mesh
|
|
Final Drive:
|
Chain
|
|
Gear Ratios:
|
1st 11.80:1 / 2nd 8.17:1 / 3rd 6.76:1 / 4th 5.84:1
|
|
Frame:
|
Brazed lug
|
|
Front Suspension:
|
Telescopic fork, 2 way hydraulic damping
|
|
Rear Suspension:
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Swingarm, 2 hydraulic dampers
|
|
Front Brakes:
|
SLS drum, 8 in
|
|
Rear Brakes:
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SLS drum, 7 in
|
|
Front Wheel:
|
3.25 x 19
|
|
Rear Wheel:
|
4.00 x 18
|
|
Wheelbase:
|
1384 mm / 54.5 in
|
|
Seat Height:
|
825.5 mm / 32.5 in
|
|
Ground Clearance:
|
127 mm / 5.0 in
|
|
Dry Weight:
|
165 kg / 363 lbs
|
|
Source:
|
Classic British Motorcycles
|