The Yamaha XS 400R Seca, manufactured in 1982, has a four-stroke parallel twin engine with a capacity of 399cc, a bore and stroke of 69.0 x 53.4mm, and a compression ratio of 9.7:1. The cooling system is air-cooled and the lubrication is wet sump. The bike has 2x 32mm Mikuni carburetors and a transistorized ignition with electric starting. It can produce a maximum power of 45.5 hp / 34 kW @ 9500 rpm and a maximum torque of 3.5 kgf-m / 25.3 lb-ft @ 8000 rpm.
The clutch is wet and multiplate, with a six-speed transmission and chain final drive. The pressed steel spine frame has the engine as a stressed member, and it has hydraulic telescopic forks at the front with a travel of 138mm / 5.5in, and a monocross system with a single coil-sprung, gas/oil damped shock at the rear with a travel of 96.5mm / 3.8in.
The front brakes have 2x discs and the rear brakes are drums. The front and rear tires have sizes 3.00-18 and 4.10-18 respectively. The rake is at 63 degrees and the trail at 95mm / 3.74in. The bike has a dry weight of 169kg / 372.9lbs and a fuel capacity of 18 liters / 4.7 US gal.
Make Model: Yamaha XS 400R Seca
Year: 1982 –
Engine: Four stroke, parallel twin, DOHC, 2 valves per cylinder
Capacity: 399 cc / 24.3 cu-in
Bore x Stroke: 69.0 x 53.4 mm
Cooling System: Air cooled
Compression Ratio: 9.7:1
Lubrication: Wet sump
Induction: 2x 32mm Mikuni carburetors
Ignition: Transistorized
Starting: Electric
Max Power: 45.5 hp / 34 kW @ 9500 rpm
Max Torque: 3.5 kgf-m / 25.3 lb-ft @ 8000 rpm
Clutch: Wet, multiplate
Transmission: 6 Speed
Final Drive: Chain
Frame: Pressed steel spine with engine as stressed member
Front Suspension: Hydraulic telescopic forks
Front Wheel Travel: 138 mm / 5.5 in
Rear Suspension: Monocross system with single coil sprung, gas/oil damped shock, pre-load adjustable
Rear Wheel Travel: 96.5 mm / 3.8 in
Front Brakes: 2x discs
Rear Brakes: Drum
Front Tyre: 3.00-18
Rear Tyre: 4.10-18
Rake: 63 degrees
Trail: 95 mm / 3.74 in
Dry Weight: 169 kg / 372.9 lbs
Fuel Capacity: 18 Litres / 4.7 US gal
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