Kawasaki AR 50 (1981-96) vs Yamaha YDS-7 (1972)
Comparison technical specifications
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| Make: | Kawasaki | Yamaha |
| Model: | AR 50 | YDS-7 |
| Years: | 1981-96 | 1972 |
| Engine: | Two stroke, single cylinder, disc valve. | Two stroke, piston-port, parallel twin |
| Capacity: | 49 cc / 3.0 cu-in | 247 cc / 15.0 cu-in |
| Bore x Stroke: | 49 x 41.6 mm | 54 x 54 mm |
| Cooling System: | Air cooled | Air-cooled |
| Compression Ratio: | 7.8:1 | 7.5;1 |
| Induction: | Mikuni VM18SC Carburetor | 26mm Mikuni |
| Ignition: | Capacitor discharge | Mitsubishi contact breaker |
| Starting: | Kick | Kick |
| Max Power: | 10.2 hp / 7.5 kW @ 8500 rpm | 30 hp @7500 rpm |
| Max Torque: | 8.53 Nm @ 8000 rpm | 21 ftlb @ 7000 rpm |
| Transmission: | 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 |
| Front Suspension: | Telescopic fork | 34mm Telescopic forks |
| Rear Suspension: | Swingarm with monoshock | Twin shock |
| Front Brakes: | Single 232mm disc | 180mm twin leading shoe drum |
| Rear Brakes: | 130 drum | 180mm single leading shoe |
| Front Tyre: | 2.50–18 | 300 x 18 |
| Rear Tyre: | 2.75–18 | 3.25 x 18 |
| Wheelbase: | 1205 mm / 47.4 in | 1300 mm / 51.1 in |
| Fuel Capacity: | 9.8 Litres / 2.1 US gal | 11.4 Litres / 3.0 gal |