Yamaha XS 500 (1973-74) vs Aprilia RC 125 (1977-82) vs Yamaha YDS-3C (1966-67)
Comparison technical specifications
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| Make: | Yamaha | Aprilia | Yamaha |
| Model: | XS 500 | RC 125 | YDS-3C |
| Years: | 1973-74 | 1977-82 | 1966-67 |
| Engine: | Four stole, parallel twin cylinder. DOHC | Single cylinder, two stroke | Two stroke, piston-port, parallel twin, Crankshaft supported in four roller bearings; needle-roller small-end and big-end bearings. Light-alloy cylinder head; |
| Capacity: | 498 cc / 30.5 cu-in | 125 cc / 7.6 cu in | 247 cc / 15.0 cu-in |
| Cooling System: | Air cooled | Air cooled | Air-cooled |
| Induction: | 2x 38mm Mikuni carburetor | Carburetor | 2x Mikunis VM24SC with air filter. Direct-operating, coupled air slides. |
| Starting: | Electric & kick | Kick | Kick |
| Max Power: | 48 hp / 36.5 kW @ 8500 rpm | 17.2 kW / 23 hp @ 10 000 rpm | 24 hp @ 7500 rpm |
| Transmission: | 5 Speed | 6 Speed | 5 Speed Helical-gear primary drive. Rear chain % x %in with top guard. Engine rpm at 30 mph in top gear, approximately 2,500. |
| Final Drive: | Chain | Chain | Chain |
| Front Suspension: | Telescopic fork. | Telescopic fork | Telescopic forks with hydraulic damping. |
| Rear Suspension: | Dual shocks swing arm, preload adjustable! | Swingarm, dual shocks with coil springs | Dual shocks swinging arm, Pivoted rear fork controlled by spring-and-hydraulic units with three-position adjustment for load. |
| Front Brakes: | Single 267mm disc | Drum | Drum |
| Rear Brakes: | Drum | Drum | Drum |
| Front Tyre: | 3.25-19 | 21 in | 3.00 -18 |
| Rear Tyre: | 3.50-18 | 18 in | 3.25 -18 |