Kawasaki S1 250SS MKI (1972-73) vs Yamaha WR 125R (2013-14) vs Harley-Davidson Harley Davidson FXST/I Softail Standard (2002-04) vs Yamaha RD 350 (1975)
Comparison technical specifications
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| Make: | Kawasaki | Yamaha | Harley-Davidson | Yamaha |
| Model: | S1 250SS MKI | WR 125R | Harley Davidson FXST/I Softail Standard | RD 350 |
| Years: | 1972-73 | 2013-14 | 2002-04 | 1975 |
| Engine: | Two stroke, transverse three cylinder, | Four stroke, forward inclined single cylinder, DOHC, 4 valve | Four stroke, 45° V-Twin, Twin Cam 88® vibration isolation-mounted Valves Pushrod-operated overhead valves; w/ hydraulic self-adjusting lifters; two valves per cylinder | Two stroke, parallel twin cylinder, reed valves |
| Capacity: | 249 cc / 15.2 cu-in | 124.7 | 1449 cc / 88.4 cu-in | 347 cc / 21.1 cu-in |
| Bore x Stroke: | 45 x 52.3mm | 52 x 58.6 mm | 95.3 x 101.6 mm | 64 х 54 mm |
| Cooling System: | Air cooled | LLiquid cooled | Air cooled | Air cooled |
| Compression Ratio: | 7,3:1 | 11.2:1 | 8.9:1 | 6.6:1 |
| Induction: | 3x Mikuni VM22SC, Ø 22 mm carburetor | Fuel injection | Carburetion 40 mm constant velocity with enrichener and accelerator pump ESPFI 38 mm throttle bore electronic sequential port fuel injection | 2, Mikuni VM28 SC |
| Ignition: | Battery and coil | TCI | Single-fire, non-wasted, map-controlled spark ignition | Battery, dual coils, breaker points |
| Starting: | Kick | Electric | Electric | Kick |
| Max Power: | 32 hp / 23.8 kW @ 8 500 rpm | 10.9 kW / 15 hp @ 9000 rpm | 67 hp / 48.8 kW @ 5200 rpm | 39 hp / 28.5 kW @ 7500 rpm |
| Max Torque: | 2.54 m-kg / 18.3 lb-ft @ 7 000 rpm | 12.2 Nm / 1.24 kgf-m @ 6000 rpm | 116.6 Nm / 86 lb-ft @ 3500rpm | 24.1 lb-ft / 32.6 Nm @ 7000 rpm |
| Transmission: | 5 Speed | 5 Speed | 5 Speed | 6 Speed |
| Final Drive: | Chain | Chain | Belt | Chain |
| Frame: | Double tubular steel cradle | Steel double cradle | Mild steel, rectangular section backbone w/twin downtubes Swing Arm Tubular mild steel | Tubular, double cradle |
| Front Suspension: | Telescopic hydraulic forks | Telescopic fork | 41.3 mm telescopic, “beer can” covers | Telescopic forks |
| Rear Suspension: | Dual shocks, Swing arm | Swinging arm link suspension | Hidden, horizontal-mounted, coil-over shock | Dual shocks |
| Front Brakes: | 180mm Drum | Single 248mm disc | Single 292mm disc 4 piston caliper | Single 267mm disc 2 piston caliper |
| Rear Brakes: | 180mm Drum | Single 220mm disc | Single 292mm disc 4 piston caliper | 178mm Drum |
| Front Tyre: | 3.00 -18 | 80/90-21 | MH90-21 54H | 3.00-18 |
| Rear Tyre: | 3.25 -18 | 110/80-18 | MT90B 16 74H | 3.25-18 |
| Rake: | 28° | 27° | 34.0° | 27.5º |
| Trail: | 110 mm / 4.3 in | 107 mm / 4.2 in | 127 mm / 5.0 in | 104 mm / 4.10 in |
| Wheelbase: | 1585 mm / 62.4 in | 1430 mm / 56.3 in | 1698 mm / 66.9 in | 1320.8 mm / 52.0 in |
| Wet Weight: | 160 kg / 348 lbs | 133 kg / 293.2 lbs | 302.4 kg / 666.6 lbs | 155 kg / 342 lbs |
| Fuel Capacity: | 15 Litres / 3.9 US gal | 8.5 Litres / 2..2 US gal | 18.9 Litres / 5.0 US gal | 15.9 Litres / 4.2 gal |