Aprilia RS4 125 (2012-13) vs Kawasaki VN 900 Vulcan Classic / Custom / LT (2025)
Comparison technical specifications
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| Make: | Aprilia | Kawasaki |
| Model: | RS4 125 | VN 900 Vulcan Classic / Custom / LT |
| Years: | 2012-13 | 2025 |
| Engine: | Four stroke, single cylinder, DOHC, 4 valves | Four stroke, 55? V-twin, SOHC, 4 valves per cylinder |
| Capacity: | 124.8 cc / 7.6 cu in | 903 cc / 49 cu-in |
| Bore x Stroke: | 58 X 47 mm | 88.0 x 74.2 mm |
| Cooling System: | Liquid cooled | Liquid cooled |
| Compression Ratio: | 12.5 ± 0.5:1 | 9.5:1 |
| Induction: | Electronic injection | 2 x DFI? with 34mm throttle bodies, with sub-throttle valves |
| Ignition: | Electronic with CDI capacity discharge | TCBI with Electronic Advance |
| Starting: | Electric | Electric |
| Max Power: | 11.7 kW / 16 hp @ 10500 rpm | 37 kW / 50 hp @ 5700 rpm |
| Max Torque: | 11 Nm / 1.12 kgf-m / 8.1 ft/lb @ 8500 rpm | 78.9 Nm / 8.0 kg-fm @ 3500 rpm |
| Clutch: | Multiple discs, in oil bath | Wet multi-disc, manual |
| Transmission: | 6 Speed | 5 Speed with positive neutral finder |
| Final Drive: | Chain | Belt, Kevlar-reinforced |
| Frame: | Aluminum perimeter frame | Double-cradle, high-tensile steel |
| Front Suspension: | Ø41 mm Upside down fork | 41mm Showa telescopic fork with 7-way preload |
| Front Wheel Travel: | 110 mm / 4.3 in | 150 mm / 5.9 in |
| Rear Suspension: | Asymmetric swingarm with monoshock | Uni-Trak with 7-way adjustable preload |
| Rear Wheel Travel: | 130 mm / 5.1 in | 103 mm / 4.1 in |
| Front Brakes: | Single Ø300 mm disc, 4 piston caliper | Single 300mm disc |
| Rear Brakes: | Single Ø218 mm disc, 1 piston caliper | Single 270mm disc |
| Front Tyre: | 110/80 17 | Classic: 80/90-16 Custom: 80/90-21 LT: 130/90-16 |
| Rear Tyre: | 130/70 17 | 180/70 -15 |
| Dimensions: | Length: 1953 mm / 76.8 in Width: 740 mm / 29.1 in Height: 1138 mm / 44.6 in | Length Classic and LT: 2463 mm 97 in. Custom:2405 mm / 94.7 in Width Classic 1006 mm / 39.6 in. Custom: 894 mm / 35.2 in Height: Classic: 1064 mm / 41.9 in. Custom: 1120 mm / 44.1 in. LT: 1480 mm / 58.3 in |
| Wheelbase: | 1350 mm / 53.1 in | 1646 mm / 64.8 in |
| Seat Height: | 820 mm / 32.3 in | Classic and LT: 681 mm / 26.8 in. Custom: 685 mm / 27.0 in |
| Fuel Capacity: | 14.5 Liters / 3.8 gal | 20 Litres / 5.3 US gal |