Aprilia RS4 50 Replica (2012-) vs Aprilia RS4 125 (2017-18) vs Kawasaki VN 1500 Vulcan Drifter (1999-01) vs Kawasaki KDX 125R (1999-00)
Comparison technical specifications
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| Make: | Aprilia | Aprilia | Kawasaki | Kawasaki |
| Model: | RS4 50 Replica | RS4 125 | VN 1500 Vulcan Drifter | KDX 125R |
| Years: | 2012- | 2017-18 | 1999-01 | 1999-00 |
| Engine: | Two stroke, single cylinder, DOHC, 4-valve | Four stroke, single cylinder, DOHC, 4 valves | Four stroke, 50° V-Twin, SOHC, 4 valves per cylinder | Two stroke, single cylinder, with KIPS |
| Capacity: | 49.9 cc / 3.05 cub in. | 124.8 cc / 7.6 cu in | 1470 cc / 89.7 cu-in | 124 cc / 7.6 cu-in |
| Bore x Stroke: | 39.9 x 39.9 mm | 58 X 47 mm | 102 x 90 mm | 56 х 50.6 mm |
| Cooling System: | Liquid cooled | Liquid cooled | Liquid cooled | Liquid cooled |
| Compression Ratio: | 11.5:1 | 12.5 ± 0.5:1 | 9.0:1 | 8,0:1 |
| Ignition: | CDI | Electronic with CDI capacity discharge | Digital | CDI |
| Starting: | Electric | Electric | Electric | Electric |
| Transmission: | 6-Speed | 6 Speed | 5 Speed | 6 Speed |
| Final Drive: | Chain | Chain: 60/13 (4.61) | Shaft | Chain |
| Front Suspension: | Upside down fork, Ø41 mm | Ø41 mm Upside down fork | 41mm cartridge fork | Kayaba 48mm telescopic hydraulic fork reversed KAYABA 48mm, double adjustment + adjustable spring preload, prepared |
| Front Wheel Travel: | 110 mm / 4.3 in. | 110 mm / 4.3 in | 150 mm / 5.9 in | 300 mm / 11.8 in |
| Rear Suspension: | Asymmetric swingarm, monoshock | Asymmetric swingarm with monoshock | Dual air assisted shock absorbers with 4-way rebound damping adjustment | Uni-Trak adjustable for preload |
| Rear Wheel Travel: | 122 mm / 4.8 in. | 130 mm / 5.1 in | 100 mm / 3.9 in | 320 mm / 12.5 in |
| Front Brakes: | Stainless steel disc, Ø 300 mm, 4-piston radial caliper | Single 300 mm disc, 4 piston caliper | 2x 320mm discs 6 piston calipers | Single 260mm disc |
| Rear Brakes: | Stainless steel disc, Ø 218 mm, single piston caliper | Single 218 mm disc, 1 piston caliper | Single 270mm disc 2 piston caliper | Single 220mm disc |
| Front Tyre: | 110/80-17 | 110/80 17 | 130/90R-16 | 70/100-21 |
| Rear Tyre: | 130/70-17 | 130/70 17 | 150/80R-16 | 4.10-18 |
| Wheelbase: | 1350 mm / 53.1 in | 1353 mm / 53.2 in | 1655 mm / 65.2 in | 1455 mm / 57.3 in to 1480 mm / 58.2 inaccording to chain tension |
| Seat Height: | 820 mm / 32.3 in. | 820 mm / 32.3 in | 739 mm / 29.1 in | 950 mm / 37.4 in |
| Fuel Capacity: | 14.5 Litres / 3.8 US gal | 14.5 Litres / 3.8 US gal | 18.9 Liter / 5.0 US gal | 9.0 Litres / 2.3 US gal |