Yamaha YDS-3C (1966-67) vs Yamaha YZF-R 25 (2016-17)
Comparison technical specifications
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| Make: | Yamaha | Yamaha |
| Model: | YDS-3C | YZF-R 25 |
| Years: | 1966-67 | 2016-17 |
| Engine: | Two stroke, piston-port, parallel twin, Crankshaft supported in four roller bearings; needle-roller small-end and big-end bearings. Light-alloy cylinder head; | Four stroke, parallel twin cylinder, DOHC, 4 valve per cylinder |
| Capacity: | 247 cc / 15.0 cu-in | 249 cc / 15.1 cu-in |
| Bore x Stroke: | 56 x 50 mm | 60 x 44.1 mm |
| Compression Ratio: | 7.5;1 | 11.6:1 |
| Cooling System: | Air-cooled | Liquid cooled |
| Induction: | 2x Mikunis VM24SC with air filter. Direct-operating, coupled air slides. | Electronic Fuel Injection |
| Ignition: | Generator | TCI: Transistor Controlled Ignition |
| Starting: | Kick | Electric |
| Max Power: | 24 hp @ 7500 rpm | 26.5 kW / 36 PS @ 12000 rpm |
| Max Torque: | 18.1 ft-lb 4.2 kgf-m @ 7500 rpm | 22.1 Nm / 16.7 lb-ft @ 10000 rpm |
| Clutch: | Wet, multi-plate clutch mounted on left side of crankshaft | Wet, multiple-disc coil spring |
| Transmission: | 5 Speed Helical-gear primary drive. Rear chain % x %in with top guard. Engine rpm at 30 mph in top gear, approximately 2,500. | Constant Mesh, 6-speed |
| Final Drive: | Chain | Chain |
| Front Suspension: | Telescopic forks with hydraulic damping. | 41mm KYB® telescopic fork; |
| Rear Suspension: | Dual shocks swinging arm, Pivoted rear fork controlled by spring-and-hydraulic units with three-position adjustment for load. | KYB® single shock |
| Front Brakes: | Drum | Single 298mm disc 2 piston caliper |
| Rear Brakes: | Drum | Single 220mm disc |
| Front Tyre: | 3.00 -18 | 110/70-17M/C 54H |
| Rear Tyre: | 3.25 -18 | 140/70-17M/C 66H |
| Wheelbase: | 1470.5 mm / 51.9 in | 1379.2 mm / 54.3 in |
| Wet Weight: | 145 kg / 320 lbs | 166 kg / 365 lbs |
| Fuel Capacity: | 11.4 Litres / 3.0 gal | 14 Litres / 3.7 gal |