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| The P125X marked a new step forward in styling (the bodywork was completely redesigned) and performance. |
| Year | Prefix | Framenumber | |
| 1977-82 | VNX1T | 1101 - 198248 |
| engine | single cylinder, 2-stroke | |
| cylinder bore | 52.5 mm | |
| piston stroke | 57 mm | |
| cubic capacity | 123.4 cc | |
| bhp at rpm | 7.75 @ 5750 | |
| lubrication | 2% | |
| carburetor | Dell'Orto SI 20/20 D | |
| gears | 4 | |
| chassis | one-piece metal pressing | |
| tires | 3.50 x 10" | |
| weight | 81 kg | |
| max. speed | 95 km/h |