Technical specifications
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Model: |
Model 90 |
Years: |
1928-33 |
Engine:
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Single cylinder, four stroke, SOHV
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Capacity:
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493 cc / 30.1 cu in
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Bore x Stroke:
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80 x 98 mm
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Compression Ratio:
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7.0:1 (Optional 7.5 or 9.0:1)
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Cooling System:
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Air cooled
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Exhaust:
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Twin
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Lubrication:
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Wet sump
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Starting:
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Kick
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Ttansmission:
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Three-speed with handshift meganism, medium ratio (BT) or close ratio (CT)
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Final Drive:
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Chain
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Gear Ratios:
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BT: 1st 10.3 / 2nd 6.9 / 3rd 4.6:1 CT: 1st: 8.4 / 2nd 6.2 / 3rd 4.6:1
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Frame:
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Single cradle, steel
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Front Suspension:
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Druid-pattern, girder forks
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Rear Suspension:
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Rigid, spring loaded saddle
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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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Tyres, Front and Rear:
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3.25 x 26" Dunlop Racing option: 2.75 x 27"
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Dimensions:
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Length: 2083 mm / 82" Width: 889 mm / 35"
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Wheelbase:
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1359 mm / 53.5"
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Saddle Height:
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711 mm / 28"
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Dry Weight:
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143 kg / 315 lbs Racing: 141.5 / 312 lbd
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Fuel Capacity:
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11.4 L / 2.5 Imp gal / 3.0 US gal
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Oil Capacity:
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2.8 L / 5.0 Imp pt / 6.0 US pt
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Top Speed:
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145 km/h / 90 mph
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