| MODEL | VOR EN 503 2001 |
| Year | 2001 |
| Engine Type | Four-stroke, single cylinder, SOHC, 4 valves per cylinder |
| Displacement / Capacity | 503 cc / 30.7 cu in |
| Bore X Stroke | 95 x 71 mm |
| Compression Ratio | 11.8:1 |
| Cooling System | Liquid cooled |
| Max Power | 40.9 kW / 56 hp @ 8000 rpm |
| Max Torque | — |
| Ignition | SEM electronic with 140 W alternator |
| Induction | Dell Orto VHSB 38 mm flat slide carburettor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5 speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Perimetral CrMo frame, oval cross-section spars, aluminium rear frame |
| Front Suspension | Upside-down Paioli Kayaba 46 mm fork, 295 mm / 11.6 in travel |
| Rear Suspension | Single progressive hydraulic Ohlins shock, adjustable preload, extension and compression, 325 mm / 12.8 in wheel travel |
| Front Brakes | Single 270 mm disc, 2 piston caliper |
| Rear Brakes | Single 220 mm disc, 1 piston caliper |
| DIMENSION SPECS | |
| Overall Length | 2160 mm / 85.0 in |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 960 mm / 37.8 in |
| Wheelbase | 1485 mm / 58.5 in |
| Ground Clearance | 370 mm / 14.6 in |
| Dry Weight | 115 kg / 254 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 90/90-21 |
| Rear Tyre | 140/80-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 9 Litres / 2.4 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The 503 cc enduro stepped up to a long-stroke 95 x 71 mm SOHC four-valve single, giving much more torque than the 400. It kept the lightweight perimeter chassis and fully adjustable suspension of the smaller models.
