Technical specifications
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| Model: |
Square Four 4G 1000, Mark I, Mark II |
| Years: |
1936-48 |
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Production:
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4G: 4 288 Mk I: 3 922 Mk II: 3 828
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Engine:
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Four stroke, vertical square four, OHV, 8 valves
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Capacity:
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997 cc / 60.8 cu in
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Bore x Stroke:
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65 x 78 mm
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Cooling System:
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Air cooled
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Compression Ratio:
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6.0:1
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Exhaust:
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Mk I, Mk II: 2 x 2-into-1
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Induction:
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SU carburetor
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Starting:
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Kick start
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Max Power:
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F4 G, Mk I: 26 kW / 35 hp @ 5500 rpm Mk II: 34 kW / 45 hp @ 5500 rpm
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Transmission:
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4-Speed
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Final Drive:
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Chain
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Frame:
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Single down tube
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Front Suspension:
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Telescopic fork
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Rear Suspension:
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Plunger-link spring
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Front Brakes:
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Drum
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Rear Brakes:
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Drum
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Wheels:
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Steel, laced wire spokes
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Dimensions:
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Length: 2100 mm / 82 in
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Wheelbase:
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1422 mm / 56 in
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Dry Weight:
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4G: 211 kg / 465 lbs Mk I: 197 kg / 435 lbs Mk II: 193 lg: 425 lbs
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Fuel Capacity:
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23 L / 6.0 US gal
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Top Speed:
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4G: 141 km/h / 87 mph Mk I: 145 km/h / 90 mph Mk II: 160 km/h / 100 mph
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