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| Substantially identical to the PK 125, it appeared in two models, PK 50 and PK 50 S, both with 4-speed gearbox and electronic ignition. |
| Year | Prefix | Framenumber | |
| 1982-88 | V5X1T | 1101 - 17512 |
| engine | single cylinder, 2-stroke | |
| cylinder bore | 38.4 mm | |
| piston stroke | 43 mm | |
| cubic capacity | 49.8 cc | |
| bhp at rpm | 1.5 @ 4500 | |
| lubrication | 2% | |
| carburetor | Dell'Orto SHB 16/10 | |
| gears | 4 | |
| chassis | one-piece metal pressing | |
| tires | 3.00 x 10" | |
| weight | 70 kg | |
| max. speed | 40 km/h |