Sunbeam Model 90
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| Sunbeam Model 90 | |
| Manufacturer | |
|---|---|
| Production | 1928 - 33 |
| Engine | Single cylinder, four stroke, SOHV |
| Compression ratio | 7.0:1 (Optional 7.5 or 9.0:1) |
| Top Speed | 145 km/h / 90 mph |
| Transmission | Final Drive: Chain |
| Frame | Single cradle, steel |
| Suspension | Front: Druid-pattern, girder forks Rear: Rigid, spring loaded saddle |
| Brakes | Front: Drum Rear: Drum |
| Wheelbase | 1359 mm / 53.5" |
| Weight | 143 kg / 315 lbs Racing: 141.5 / 312 lbd (dry), |
| Oil Capacity | 2.8 L / 5.0 Imp pt / 6.0 US pt |
| Fuel Capacity | 11.4 L / 2.5 Imp gal / 3.0 US gal |
| Manuals | Service Manual |
It could reach a top speed of 145 km/h / 90 mph.
Engine[edit | edit source]
The engine was a Air cooled cooled Single cylinder, four stroke, SOHV. The engine featured a 7.0:1 (Optional 7.5 or 9.0:1) compression ratio.
Chassis[edit | edit source]
Stopping was achieved via Drum in the front and a Drum in the rear. The front suspension was a Druid-pattern, girder forks while the rear was equipped with a Rigid, spring loaded saddle. The Model 90 was fitted with a 11.4 L / 2.5 Imp gal / 3.0 US gal fuel tank. The bike weighed just 143 kg / 315 lbs Racing: 141.5 / 312 lbd. The wheelbase was 1359 mm / 53.5" long.
Photos[edit | edit source]
Overview[edit | edit source]
| Make Model. | Sunbeam Model 90 |
|---|---|
| Year | 1928 - 33 |
| Engine Type | Single cylinder, four stroke, SOHV |
| Displacement | 493 cc / 30.1 cu in |
| Bore X Stroke | 80 x 98 mm |
| Compression | 7.0:1 (Optional 7.5 or 9.0:1) |
| Cooling System | Air cooled |
| Exhaust | Twin |
| Lubrication | Wet sump |
| Starting | Kick |
| Ttansmission | Three-speed with handshift meganism, medium ratio (BT) or close ratio (CT) |
| Final Drive | Chain |
| Gear Ratios | BT: 1st 10.3 / 2nd 6.9 / 3rd 4.6:1 CT: 1st: 8.4 / 2nd 6.2 / 3rd 4.6:1 |
| Frame | Single cradle, steel |
| Front Suspension | Druid-pattern, girder forks |
| Rear Suspension | Rigid, spring loaded saddle |
| Front Brakes | Drum |
| Rear Brakes | Drum |
| Wheels | Steel, laced wire spokes |
| Tires, Front And Rear | 3.25 x 26" Dunlop Racing option: 2.75 x 27" |
| Dimensions | Length: 2083 mm / 82" Width: 889 mm / 35" |
| Wheelbase | 1359 mm / 53.5" |
| Saddle Height | 711 mm / 28" |
| Dry Weight | 143 kg / 315 lbs Racing: 141.5 / 312 lbd |
| Fuel Capacity | 11.4 L / 2.5 Imp gal / 3.0 US gal |
| Oil Capacity | 2.8 L / 5.0 Imp pt / 6.0 US pt |
| Top Speed | 145 km/h / 90 mph |