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Triumph T120R Bonneville 650 (1966-67) vs Yamaha DT 400 (1978-79)

Comparison technical specifications


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1966 Triumph T120R Bonneville 650
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1978 Yamaha DT 400
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Make: Triumph Yamaha
Model: T120R Bonneville 650 DT 400
Years: 1966-67 1978-79
Engine: Four stroke, parallel twin, OHV Two stroke, single cylinder, read valve
Capacity: 649 cc / 39.6 cu in 397 cc / 24.2 cu-in
Bore x Stroke: 71 x 82 mm 85 Ñ… 70 mm
Compression Ratio: 8.5:1 6.4:1
Cooling System: Air cooled Air cooled
Induction: 2 x Amal 1 - 1/6" carburetors Single 28mm Mikuni carburetor
Ignition: Lucas MA6 alternator with 2 coils CDI
Starting: Kick Kick
Max Power: 34 kW / 46 hp @ 6500 rpm 23 hp / 17.1 kW @ 5500 rpm
Transmission: 4 Speed, constant mesh 5 Speed
Final Drive: Chain, 106 links Chain
Front Suspension: Telescopic forks, hydraulic damping Telescopic forks
Rear Suspension: Swingarm, twin Girling dampers Swinging arm fork
Front Brakes: 8" SLS drum Drum
Rear Brakes: 7" SLS drum Drum
Front Tyre: 3.25 x 19, Dunlop Universal 3.00-21
Rear Tyre: 4.00 x 18, Dunlop Universal 4.00-18
Wheelbase: 1403 mm / 55.2 in 1410 mm / 55.5 in
Dry Weight: 165 kg / 363 lbs 124 kg / 272 lbs
Fuel Capacity: US: 13.6 L / 3.6 US gal / 3 Imp gal / UK and other Export: 18 L / 4.8 US gal / 4 Imp gal 9 Litres / 2.3 US gal