Honda CBR 400RR (1988) vs Suzuki Boulevard S40 (2015-16) vs Yamaha XT 600E (1997-98) vs BMW R 51 (1938-40)
Comparison technical specifications
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| Make: | Honda | Suzuki | Yamaha | BMW |
| Model: | CBR 400RR | Boulevard S40 | XT 600E | R 51 |
| Years: | 1988 | 2015-16 | 1997-98 | 1938-40 |
| Engine: | Four stroke, transverse four cylinder, DOHC, 4 valve per cylinder. | Four stroke, single cylinder, SOHC | Four stroke, single cylinder, SOHC, 4 valve | Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder. |
| Capacity: | 399 cc / 24.3 cu-in | 652 cc / 39.8 cu-in | 595 cc / 36.3 cu-in | 494 cc / 30.1 cu in. |
| Bore x Stroke: | 55 x 42 mm | 94 x 94.0 mm | 95 x 84 mm | 68 x 68 mm |
| Cooling System: | Liquid cooled; radiator with cooling fan | Air cooled | Air/oil cooled | Air cooled |
| Compression Ratio: | 11.3:1 | 8.5:1 | 8.5:1 | 6.7:1 |
| Induction: | 4x 26mm Flat-side CV | Mikuni BS40 | Single 28mm Y26PV carburetor | 2 x Amal 5/423 carburetors |
| Ignition: | Digitalized full transistor ignition | Transistorized | T.C.I. | Battery ignition |
| Starting: | Electric | Electric | Electric | Kick |
| Max Power: | 59 hp / 42.2 kW @ 12500 rpm | 23 kW / 31 hp @5400 rpm | 45 hp / 32.8 kW @ 6500 rpm | 18 kW / 24 hp @ 5800 rpm |
| Transmission: | 6 Speed | 5 Speed | 5 Speed | 4 Speed |
| Final Drive: | Chain | Belt | Chain | Shaft |
| Front Suspension: | 41mm Showa damper-rod forks with adjustable pre-load | Telescopic 38 mm stanchions, coil spring, oil damped | 41mm Telescopic forks, oil damped | Telescopic fork |
| Rear Suspension: | Showa gas/oil shock with adjustable preload and compression | Twin shock, 5-way adjustable spring preload | Monocross with preload adjustment, | Long swing arm with suspension units and oil pressure shock absorbers |
| Front Brakes: | 2x 275mm discs 4 piston calipers | 265 mm Single disc | Single 267mm discs 2 piston caliper | ∅200mm Drum, duplex full hub |
| Rear Brakes: | Single 220mm disc 2 piston caliper | Drum, rod operated | Single 220mm disc single piston caliper | ∅200mm Drum, simplex full hub |
| Front Tyre: | 120/60-17 | 100/90-19 57H, tube type | 90/90-21 | 3.50 -19" |
| Rear Tyre: | 150/60-18 | 140/80-15 67H, tube type | 120/90-17 | 3.50 -19" |
| Fuel Capacity: | 15 Litres / 4.0 gal | 10.5 Litres / 2.6 US gal | 15 Litres / 4.0 US gal | 14 liters / 3.60 US gal |