Kawasaki S2 350SS MKII (1973-74) vs Yamaha YZF-R 3 Monster Moto GP Replica (2021) vs Yamaha XS 850SG Midnight Special (1981)
Comparison technical specifications
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| Make: | Kawasaki | Yamaha | Yamaha |
| Model: | S2 350SS MKII | YZF-R 3 Monster Moto GP Replica | XS 850SG Midnight Special |
| Years: | 1973-74 | 2021 | 1981 |
| Engine: | Two stroke, transverse three cylinder | Four stroke, parallel twin cylinder, DUHC, 4 valve per cylinder | Four stroke, transverse three cylinder, DOHC, 2 valves per cylinder |
| Capacity: | 346 cc / 21 cu-in | 321 cc / 19.5 cu-in | 826 cc / 50.4 cu in |
| Cooling System: | Air cooled | Liquid cooled | Air cooled |
| Bore x Stroke: | 53 x 52.3 mm | 68.0 x 44.1mm | 71.5 x 68.6 mm |
| Compression Ratio: | 7,3:1 | 11.2:1 | 9.2:1 |
| Induction: | 3x Mikuni VM24SC, Ø 24 mm carburetors | Electronic Fuel Injection, 32 mm throttle body | 3 x 34mm Hitachi HSC34 carburetors |
| Ignition: | Battery and coil | TCI: Transistor Controlled Ignition | Transistor controlled |
| Starting: | Kick | Electric | Electric and kick |
| Max Power: | 45 hp / 33.5 kW @ 8000 rpm | 30.9 kW 41.4 hp @ 10750 rpm | 57.7 kW / 79 hp @ 8500 rpm |
| Max Torque: | 30.7 lb-ft 41.6 Nm @ 7000 rpm | 29.6 Nm / 3.0 kg-m @ 9000 rpm | 66.7 Nm / 6.8 kgf-m / 49.2 ft-lb @ 6500 rpm |
| Transmission: | 5 Speed | Constant Mesh, 6-speed | 5 Speed |
| Final Drive: | Chain | “O” ring chain | Shaft |
| Front Suspension: | Telescopic Hydraulic forks | 37 mm USD Inverted telescopic fork | Air assisted telescopic forks |
| Rear Suspension: | Dual shocks, Swing arm | Monocross single Kayaba shock, adjustable preload | Swing arm 4-way adjustable damping |
| Front Brakes: | 180mm Drum | Single 298mm disc 2 piston caliper | 2 x 267mm Discs, 1 piston calipers |
| Rear Brakes: | 180mm Drum | Single 220mm disc 1 piston caliper | Single 267mm disc, 1 piston caliper |
| Front Tyre: | 3.00 -18 | 110/70-17M/C 54H | 3.25H-19 |
| Rear Tyre: | 3.50 -18 | 140/70-17M/C 66H | 4.00H-17 |
| Wheelbase: | 1330 mm / 52 in | 1379.2 mm / 54.3 in | 1450 mm / 57.1 in |
| Fuel Capacity: | 14 Litres / 3.7 US gal | 14 Litres / 3.7 US gal | 24 Litres / 6.3 US gal |