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Selection of DENSO U-Groove spark plugs with short threads compatible with various mopeds, scooters, and small motorcycles.
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.
This special 2-stroke spark plug is installed as standard equipment by renowned motorcycle manufacturers.
The patented U-shape of the ground electrode creates a larger and hotter flame front, which ensures complete combustion and thus eliminates excessive fouling and erratic starting caused by poor fuel mixtures. Due to the placement of the U-groove in the ground electrode, it remains intact throughout the spark plug’s entire service life. The special coating also protects the spark plug from oil contamination and significantly extends its service life.
Breakdown of the short code:
W: Thread size 14x1.25 mm / Wrench size 21 mm
Number: Heat range
F: Thread length 12.7 mm (short thread)
S: Standard version
U: U-shaped ground electrode (U-Groove)
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 modified engines)
Please select the appropriate spark plug from the drop-down menu.
Note: For official MFK certification, the ignition system must include an interference-suppressed component. These spark plugs are not interference-suppressed and must therefore be used in combination with an interference-suppressed spark plug connector when driving 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 |
| Candle thread type | short |
| Area of application | Tuning |
| Spark plug socket | M4 |
| Suppressed | No |
| Thread type | MF14x1.25 (fine pitch thread) |
| Width across flats | 21 mm |
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