Engineered by Silk for the allround motorcycle segment, the 1979 Silk 700S Sabre Mk2 features a 653 cc (39.9 cu in) liquid-cooled twin, two-stroke configuration. In factory specification, peak output is rated at 54 HP (39.4 kW) at 6,000 rpm, transferring power to the rear wheel through a 4-speed gearbox and chain final drive. With a specific output of 82.7 HP per liter, the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the 700S Sabre Mk2 measures 140 kg (309 lbs) dry, translating to a power-to-weight ratio of 0.39 HP/kg (2.59 kg per horsepower).
Within MotoLibrary's Silk archive, this model family spans 2 indexed model years from 1978 to 1979, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
82.7 HP/L
Power-to-Weight
0.39 HP/kg (2.59 kg/HP)
Engine
Displacement653.0 ccm (39.85 cubic inches)
Engine TypeTwin, two-stroke
Power54.0 HP (39.4 kW)) @ 6000 RPM
Fuel SystemCarburettor
IgnitionElectronic
Lubrication50:1 petroil mix
CoolingLiquid
Transmission
Gearbox4-speed
Final DriveChain (final drive)
Performance
Top Speed177.0 km/h (110.0 mph)
ExhaustExhaust pipes,Ossa silencer
Chassis
Front SuspensionCerriani style forks
Rear SuspensionTwin shocks
Wheels & Brakes
Front Tyre3.60-18
Rear Tyre4.10-18
Front BrakesSingle disc
Front Brake Ø254 mm (10.0 inches)
Rear BrakesExpanding brake (drum brake)
Rear Brake Ø180 mm (7.1 inches)
WheelsSix-spoke Campagnolo cast wheel
Dimensions & Weight
Dry Weight140.0 kg (308.6 pounds)
Power/Weight0.3857 HP/kg
Other
StarterKick
Color OptionsBlack
Notes
Silk Engineering was British company. A total of 138 Silk 700S bikes was made from 1975 to 1979.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
