Honda CBR 400RR (1988) vs Suzuki Boulevard S40 (2015-16) vs Yamaha XT 600E (1997-98) vs BMW R 51 (1938-40) vs KTM 450 Rally (2012)
Comparison technical specifications
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| Make: | Honda | Suzuki | Yamaha | BMW | KTM |
| Model: | CBR 400RR | Boulevard S40 | XT 600E | R 51 | 450 Rally |
| Years: | 1988 | 2015-16 | 1997-98 | 1938-40 | 2012 |
| 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. | Four stroke, single cylinder, SOHC, 4 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. | 449.3 cc / 27.4 in |
| Bore x Stroke: | 55 x 42 mm | 94 x 94.0 mm | 95 x 84 mm | 68 x 68 mm | 97 x 60.9 mm |
| Cooling System: | Liquid cooled; radiator with cooling fan | Air cooled | Air/oil cooled | Air cooled | Liquid Cooled |
| Compression Ratio: | 11.3:1 | 8.5:1 | 8.5:1 | 6.7:1 | 12.5:! |
| Induction: | 4x 26mm Flat-side CV | Mikuni BS40 | Single 28mm Y26PV carburetor | 2 x Amal 5/423 carburetors | Keihin FCR-MX 41 |
| Ignition: | Digitalized full transistor ignition | Transistorized | T.C.I. | Battery ignition | Ignition Keihin DC ECUl |
| Starting: | Electric | Electric | Electric | Kick | Electric |
| Transmission: | 6 Speed | 5 Speed | 5 Speed | 4 Speed | 5 Speed |
| Final Drive: | Chain | Belt | Chain | Shaft | Chain, 5/8 x 1/4" |
| 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 | WP-USD Ø 48 mm |
| 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 | WP-Monoshock with Pro-Lever linkage |
| Front Brakes: | 2x 275mm discs 4 piston calipers | 265 mm Single disc | Single 267mm discs 2 piston caliper | ∅200mm Drum, duplex full hub | Single 300 mm disc, Brembo two-piston, floating caliper |
| Rear Brakes: | Single 220mm disc 2 piston caliper | Drum, rod operated | Single 220mm disc single piston caliper | ∅200mm Drum, simplex full hub | Single 240 mm disc, 1 piston, floating caliper |
| Front Tyre: | 120/60-17 | 100/90-19 57H, tube type | 90/90-21 | 3.50 -19" | 90/90 - 2154S TT, Michelin T63 |
| Rear Tyre: | 150/60-18 | 140/80-15 67H, tube type | 120/90-17 | 3.50 -19" | 130/80 - 18 66S TT, Michelin T63 |
| 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 | 35 L / 9.2 US gal / 7.7 Imp gal |