BMW R 80GS (1989) vs Yamaha RD 125 (1979-80)
Comparison technical specifications
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| Make: | BMW | Yamaha |
| Model: | R 80GS | RD 125 |
| Years: | 1989 | 1979-80 |
| Engine: | Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder | Two stroke, parallel twin |
| Capacity: | 797.5 cc / 48.7 cu in. | 124 cc / 7.6 cu-in |
| Bore x Stroke: | 84.8 x 70.6 mm | 43 х 43 mm |
| Cooling System: | Air cooled | Air cooled |
| Compression Ratio: | 8.2:1 | 6.8:1 |
| Induction: | 2 x Bing constant depression carburetors | 2x 18mm Teikei carburetors |
| Ignition: | Battery ignition | Battery coil |
| Starting: | Electric | Kick |
| Max Power: | 37 kW / 50 hp @ 6500 rpm | 17 hp / 12.4 kW @ 8500 rpm |
| Max Torque: | 61 Nm / 6.2 kgf-m / 44 ft lb @ 5000 rpm | 1.3 kgf-m @ 8000 rpm |
| Transmission: | 5 Speed | 5 Speed |
| Final Drive: | Shaft | Chain |
| Gear Ratio: | 1st 4.40 / 2nd 2.86 / 3rd 2.07 / 4th 1.67 / 5th 1.50:1 | (1) 34.52 (2) 19.67 (3) 14.11 (4) 11.34 (5) 9.11 |
| Frame: | Double loop tubular frame with bolt on rear section | steel tube engine used as a stressed member |
| Front Suspension: | ∅40mm Marzocchi telescopic hydraulic forks. | 28 mm telescopic forks |
| Rear Suspension: | BMW Paralever swinging arm | Dual rear shock pre-load adjustable |
| Front Brakes: | Single ∅285mm disc | Single240mm disc |
| Rear Brakes: | ∅200mm Drum | 130 mm Drum |
| Front Tyre: | 90/90 x 21S | 2.75-18 |
| Rear Tyre: | 13/80 x 17S | 3.00-18 |
| Wheelbase: | 1514 mm / 59.6 in | 1245 mm / 49.0 in |
| Seat Height: | 850 mm / 33.5 in | 749 mm / 29.5 in |
| Wet Weight: | 210 kg / 462 lbs | 115 kg / 255 lbs |
| Fuel Capacity: | 24 L / 6.3 US gal | 11.5 Litres / 3.04 US gal |