Zündkerzenübersicht 
Original Bosch spark plugs with copper electrode and short thread, suitable for various mopeds, mopeds or small engine bikes.
The green rings indicate the ignition performance of days gone by, when emission values still played a secondary role.
This spark plug fits the following mopeds, among others: Alpa Cross 2000, Alpa Grand Sport, Alpa Cristall 50/2, Alpa Panda, Cilo Cross, KTM GTX 503, Piaggio Boss, Piaggio Boxer, Piaggio Bravo, Piaggio Ciao, Piaggio Si, Pony GT Cross, Pony GTA, Pony GTX, Pony Junior 50/2, Pony Junior 503, Puch Maxi S, Puch Maxi N, Puch Maxi N Chopper, Puch Maxi Plus, Puch X30 Sport NS / NL, Puch X30 Velux, Puch Supermaxi, Sachs Rixe 50/2, Sachs Turbo, Sachs 503, etc.
Notes:
For an official MFK approval, it is necessary for the ignition system to have a de-rusted component. This spark plug is not deflashed and must therefore be combined with a deflashed spark plug connector in public road traffic.
Before purchasing, use the downloadable spark plug overview to check which type is best suited to your setup.
| Manufacturer | BOSCH |
| Candle designation | W9AC |
| Candle thread type | long |
| Spark plug socket | M4, SAE |
| Electrode material | Copper |
| Suppressed | No |
| Width across flats | 21 mm |
| Thread type | MF14x1.25 (fine pitch thread) |
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