KTM 990 Super Duke (2006) vs Suzuki Boulevard S40 (2017-18) vs Indian Chief Classic (2015-16) vs Yamaha TX 750 (1973)
Comparison technical specifications
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| Make: | KTM | Suzuki | Indian | Yamaha |
| Model: | 990 Super Duke | Boulevard S40 | Chief Classic | TX 750 |
| Years: | 2006 | 2017-18 | 2015-16 | 1973 |
| Engine: | Four stroke, 75°V-twin cylinder, DOHC, 4 valves per cylinder | Four stroke, single cylinder, SOHC | Thunder Stroke™ 111 | Four stroke, parallel twin cylinders, SOHC 2 valve per cylinder |
| Capacity: | 999.8 cc / 60.9 cu-in | 652 cc / 39.8 cu-in | 1811.cc / 105 cu-in | 743 cc / 45.3 cu-in |
| Bore x Stroke: | 101 x 62.4mm | 94 x 94.0 mm | 101 x 113 mm | 80 x 74 mm |
| Compression Ratio: | 11.5:1 | 8.5:1 | 9.5:1 | 8.8:1 |
| Induction: | Electronic fuel injection / electric | Mikuni BS40 | Electronic Fuel Injection System Closed loop fuel injection / 54mm bore | Carburetor |
| Starting: | Electric | Electric | Electric | Electric & Kick |
| Transmission: | 6 Speed | 5 Speed | 6 Speed | 5 Speed |
| Final Drive: | Chain, X-Ring 5/8 x 5/16" | Belt | Belt | Chain |
| Front Suspension: | 48mm WP Upside down adjustable | Telescopic 38 mm stanchions, coil spring, oil damped | Telescopic forks, | Telescopic forks |
| Rear Suspension: | WP shock, fully adjustable | Twin shock, 5-way adjustable spring preload | Single shock, | Dual shock |
| Front Brakes: | 2x 320mm discs 4 piston calipers | 265 mm Single disc | 2x 300 mm Floating Rotor 4 piston calipers | Single or dual 300mm disc 2 piston calipers (In Japan, the United States, and other markets the bike had a single disc, although the lugs needed to mount a second disc were in place. ) |
| Rear Brakes: | Single 240mm disc 1 piston caliper | Drum, rod operated | Single 300 mm Floating Rotor 2 piston calipers | 180mm Drum |
| Front Tyre: | 120/70 ZR17 | 100/90-19 57H, tube type | 130/90B16 67H | 3.50-19 |
| Rear Tyre: | 180/55 ZR17 | 140/80-15 67H, tube type | 180/65B16 81H | 4.00-18 |
| Rake: | 24° | 35° | 29° | 27° |
| Trail: | 103 mm / 4.0 in | 147 mm / 5.8 in | 155 mm / 6.1 in | 99 mm / 3.9 in |
| Wheelbase: | 1438 mm / 56.6 in | 1480 mm / 58.3 in | 1646 mm mm / 68.1 in | 1455 mm / 57.3 in |
| Seat Height: | 855 mm / 33.6 in | 700 mm / 27.6 in | 692 mm / 29.0 in | 810 mm / 32 in |
| Ground Clearance: | 165 mm / 6.4 in | 135mm / 5.3 in | 139.7 mm / 5.5 in | 160 mm / 6.3 in |
| Fuel Capacity: | 18.5 Litres / 4.8 gal | 10.5 Litres / 2.6 US gal | 20.8 Litres / 5.5 Gal | 14 Litres / 3.7 US gal |