Yamaha RD 125 (1979-80) vs Aprilia RC 125 (1977-82) vs Harley-Davidson Harley Davidson XL 1200R Sportster Roadster (2020) vs Kawasaki ZZ-R 1100 D (1994)
Comparison technical specifications
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| Make: | Yamaha | Aprilia | Harley-Davidson | Kawasaki |
| Model: | RD 125 | RC 125 | Harley Davidson XL 1200R Sportster Roadster | ZZ-R 1100 D |
| Years: | 1979-80 | 1977-82 | 2020 | 1994 |
| Engine: | Two stroke, parallel twin | Single cylinder, two stroke | Four stroke, 45° V-Twin, OHV, 2 valves per cylinder. | Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder. |
| Capacity: | 124 cc / 7.6 cu-in | 125 cc / 7.6 cu in | 1202 cc / 73.4 cub in. | 1052 cc / 64.1 cu-in |
| Cooling System: | Air cooled | Air cooled | Air cooled | Liquid cooled, |
| Induction: | 2x 18mm Teikei carburetors | Carburetor | Electronic Sequential Port Fuel Injection (ESPFI) | 4x Keihin CVKD40 carbs |
| Starting: | Kick | Kick | Electric | Electric |
| Transmission: | 5 Speed | 6 Speed | 5 Speed | 6 Speed |
| Final Drive: | Chain | Chain | Belt | Chain |
| Front Suspension: | 28 mm telescopic forks | Telescopic fork | 43 mm inverted front forks with premium cartridge dampening technology and triple clamp design | 43mm forks preload and rebound adjustable. |
| Rear Suspension: | Dual rear shock pre-load adjustable | Swingarm, dual shocks with coil springs | Premium emulsion technology rear shocks with screw style pre-load adjustment | Monoshock fully adjustable. |
| Front Brakes: | Single240mm disc | Drum | 2x 300mm floating discs, 2 piston caliper | 2x 320mm discs 4 piston calipers |
| Rear Brakes: | 130 mm Drum | Drum | Single 292mm disc, 1 piston caliper | Single 240mm disc 1 piston caliper |
| Front Tyre: | 2.75-18 | 21 in | 120/70R19 M/C | 120/70 VR17 |
| Rear Tyre: | 3.00-18 | 18 in | 150/70R18 M/C | 180/55 VR17 |