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Selection of DENSO U-Groove Iridium spark plugs with short threads compatible with various mopeds and small motorcycles.
This spark plug is compatible with 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.
This special 2-stroke spark plug is primarily used in racing and is installed by well-known motorcycle manufacturers.
The center electrode, which is only 0.4 mm thick, ensures low ignition voltage requirements, a perfect spark, and high ignition reliability. In addition, the patented U-shape of the ground electrode creates a larger and hotter flame front, ensuring complete combustion. Thanks to the iridium alloy, carbon buildup is prevented, self-cleaning properties are ensured, and temperature resistance is increased.
The service life is approximately two to three times longer than that of conventional spark plugs.
Breakdown of the short code:
I: Iridium
spark plug type W: Thread size 14x1.25 mm / wrench size 21 mm
F: Thread length 12.7 mm (short thread)
Number: Heat range
DENSO Heat Range Overview:
9–20 normal heat range (hot spark plug, for standard and original engines)
21–27 medium heat range (normal spark plug, for tuned engines)
29–32: high heat range (cold spark plug, for heavily tuned engines)
Please select the appropriate spark plug from the drop-down menu.
Note: For official MFK approval, the ignition system must include a noise-suppressed component. These spark plugs are not noise-suppressed and must therefore be used in combination with a noise-suppressed spark plug connector when driven on public roads. Before purchasing, use the downloadable spark plug overview to check which type is best suited for your setup.
You can find alternative spark plugs and connection hardware for your ignition system in the accessories section.
A quality product from the Japanese manufacturer DENSO.
| Manufacturer | DENSO |
| Area of application | High End, Cross, Tuning |
| Candle thread type | short |
| Spark plug socket | M4 |
| Suppressed | No |
| Electrode material | Iridium |
| Width across flats | 21 mm |
| Thread type | MF14x1.25 (fine pitch thread) |
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