Yamaha XJ 650 Maxim (1982) vs Yamaha XS 650 Midnight Special (1981) vs Yamaha YZF 600R Thundercat (1997) vs Yamaha SR 400 (1983-87)
Comparison technical specifications
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| Make: | Yamaha | Yamaha | Yamaha | Yamaha |
| Model: | XJ 650 Maxim | XS 650 Midnight Special | YZF 600R Thundercat | SR 400 |
| Years: | 1982 | 1981 | 1997 | 1983-87 |
| Engine: | Four stroke, transverse four cylinder, DOHC, 2 valves per cylinder, | Four stroke, parallel twin cylinder, SOHC, 2 valves per cylinder. | Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder | Four stroke, single cylinder, SOHC, 2 valves per cylinder. |
| Capacity: | 653 cc / 39.8 cu-in | 653 cc / 39.8 cu in | 599 cc / 36.5 cu-in | 399 cc / 24.3 cu-in |
| Bore x Stroke: | 63 х 52.4 mm | 75 x 74 mm | 62 x 49.6 mm | 87 х 67.2 mm |
| Cooling System: | Air-cooled | Air cooled | Liquid cooled | Air cooled |
| Compression Ratio: | 9.2:1 | 8.5:1 | 12.0:1 | 8.5:1 |
| Induction: | 4x 32mm Hitachi carburetors | 2 x Mikuni BS34SU carburetors | 4 x 36 mm Keihin CV downdraft carburetors | BSR33 carburetor |
| Ignition: | Transistorized | Battery, induction coil | Digital TCI | CDI |
| Starting: | Electric | Electric and kick | Electric | Kick |
| Max Power: | 71 hp / 51.8 kW @ 9400 rpm | 39.5 kW / 53 hp @ 7200 rpm | 72.9 kW / 100 hp @ 11500 rpm | 27 hp / 17.1 KW @ 7000 rpm |
| Max Torque: | 57 Nm / 42 lb-ft @ 7500 rpm | 54 Nm / 5.5 kgf-m / 39.8 lb-ft @ 5500 rpm | 65.7 Nm / 6.7 kgf-m / 48.7 lb-ft @ 9500 rpm | 27.4 Nm / 6.3 kgf-m @ 6500 rpm |
| Transmission: | 5 Speed | 5 Speed | 6 Speed | 5 Speed |
| Final Drive: | Shaft | Chain | 530 O-ring chain OEM sprocket sizes per tooth Front= 15 Back= 47 | Chain |
| Front Suspension: | 26mm Air assisted telescopic forks | Telescopic forks | 41 mm telescopic fork adjustable preload, compression and rebound damping | Telescopic fork |
| Rear Suspension: | Duel Kayaba shocks, 5-way adjustable spring preload | Dual shock absorbers | Monoshock adjustable preload, bump and rebound | Dual shocks |
| Front Brakes: | Single 300mm disc | Twin hydraulic discs, 267 mm | 2x 300 mm Discs, 4 piston calipers | Single disc |
| Rear Brakes: | Drum | Single hydraulic disc, 267 mm | Single 245mm disc, 2 piston caliper | Drum |
| Front Tyre: | 3.25 H19 | 3.50S-19 | 120/60-17 | 3.50-19 |
| Rear Tyre: | 130/90 H16 | 130/90S-16 | 160/60-17 | 4.00-16 |
| Seat Height: | 744 mm / 29.3 in | 785 mm / 30.9" | 810 mm / 31.7 in | 790 mm / 30.9 in |
| Fuel Capacity: | 13 Litres / 3.4 US gal | 11.5 Litres / 3.0 US gal | 19 Litres / 5.0 US gal / 4.2 Imp gal | 12 Litres / 3.2 gal |