Technical specifications
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| Model: |
6T Thunderbird |
| Years: |
1954-62 |
|
Engine:
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Four stroke, vertical twin, OHV
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|
Capacity:
|
649 cc / 40.0 cu in
|
|
Bore x Stroke:
|
71 x 82 mm
|
|
Cooling System:
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Air cooled
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Compression Ratio:
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8.5:1 (Export), 7.0:1 (UK)
|
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Exhaust:
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Two-into-two
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Induction:
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SU type MC2
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Ignition:
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Lucas RM14
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Starting:
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Kick
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Max Power:
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25 kW / 34 hp @ 6500 rpm
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Clutch:
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Wet, multiplate
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Transmission:
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4-Speed constant mesh
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Final Drive:
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Chain, 101 links
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Gear Ratios:
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1st 11.90:1 / 2nd 8.25:1 / 3rd 5.81:1 / 4th 4.88:1
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Frame:
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Brazed lug
|
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Front Suspension:
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Telescopic fork, hydraulic damping
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Rear Suspension:
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Swingarm, 2 Griling dampers
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Front Brakes:
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SLS drum, 8 in
|
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Rear Brakes:
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SLS drum, 7 in
|
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Front Wheel:
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3.25 x 19
|
|
Rear Wheel:
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3.50 x 19
|
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Wheelbase:
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1410 mm / 55.75 in
|
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Seat Height:
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775 mm / 31 in
|
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Ground Clearance:
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127 mm / 5.0 in
|
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Dry Weight:
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179 kg / 395 lbs
|
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Fuel Capacity:
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13.6 L / 3.6 US gal / 3.0 Imp gal (US), 18 L / 4.8 US gal / 4.0 Imp gal (UK and export)
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Source:
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Classic British Motorcycles
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