BSA M21 | APRILIA RS 457 |
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engine specs | |
Type | |
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air-cooled, four-stroke, single cylinder, side valve | liquid-cooled twin-cylinder engine with dual camshaft timing and four valves per cylinder |
Displacement | |
591 cm3 | - |
Bore X Stroke | |
3.2x4.4 in OR 81 mm | - |
Compression Ratio | |
5.0:1 | - |
Horsepower | |
15/4200 KW(hp)/RPM | 48/- KW(hp)/RPM |
Fuel System | |
Amal carburetor | - |
transmission specs | |
Gearbox | |
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4-speed, manual | - |
Clutch | |
dry, multi-plate | - |
Final Drive | |
chain | - |
chassis specs | |
Frame | |
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steel | Aluminium frame |
Front Suspension | |
single spring girder fork | - |
Rear Suspension | |
hard-tail, sprung seat | - |
Front Brake | |
drum | - |
Rear Brake | |
drum | - |
dimension specs | |
Overall Length | |
---|---|
85.8 in OR 2179 mm | - |
Overall Width | |
29.1 in OR 739 mm | - |
Seat Height | |
28.5 in OR 724 mm | - |
Ground Clearance | |
4.6 in OR 117 mm | - |
Weight | |
368 lbs OR 167 kg | 351 lbs OR 159 kg |
Fuel Capacity | |
3.7 gallons OR 14.0 L | - |
Wheelbase | |
54 in OR 1372 mm | - |
tyres specs | |
Front | |
---|---|
3.25 x 19 | - |
Rear | |
3.50 x 19 | - |